Sony SRP-L300 Users guide

Table of Contents

2-346-314-11(2)

Digital Limiter/Delay

SRP-L300

Operating Instructions

ADJUST

INPUT LEVEL

OUTPUT LEVEL

CH-1 CH-2

0

−12 +12

dB

INPUT

ANALOG

0

DIGITAL

PLL

−12 +12

dB

-

LIMITER / DELAY

CH-1
CH-2

1

OVER/GR(dB)

36912151821242730

CH-1 CH-2

OVER

0

POWER

ON OFF

0

−12 +12

−12 +12

dB

dB

Before operating, please read this manual carefully.

Be sure to keep it properly for future reference.

−+

SELECT

−+

PUSH ENTER/YES

EDIT PROGRAM

SYNC EXIT/NO

DIGITAL LIMITER/DELAY SRP-L300

LOCK

BYPASS

Warning .........................................

Precautions ....................................

1. Outline .....................................

2. Glossary ...................................

3. Controls and Functions ..........

4. Basic Operation.......................

5. Internal Signal Flow ...............

6. Digital Signal Processing

Block ........................................

7. Parameter Change ..................

8. Program Store and Recall ......

9. Lock Functions ........................

10. Digital Input and Output .......

11. Main Specifications ................

12. External Dimensions...............

2
3
5
6
7
10
11

13
25
31
36
40
41
42

Preset Program .............................

43

© 2001 Sony Corporation

1

WARNING

NL

Notice for the Customers in the United
Kingdom

IMPORTANT

The wires in this mains lead are coloured in accordance

with the following code:

Blue : Neutral

Brown : Live

As the colours of the wires in the mains lead of this

apparatus may not correspond with the coloured markings

identifying the terminals in your plug, proceed as follows:

The wire which is coloured blue must be connected to the

terminal which is marked with the letter N or coloured

black. The wire which is coloured brown must be

connected to the terminal which is marked with the letter

L or coloured red. Do not connect either wire to the earth

terminal in the plug which is marked by the letter E or by
the safety earth symbol Y or coloured green or green-and-

yellow.

This symbol is intended to alert the user to

the presence of uninsulated “dangerous

voltage” within the product’s enclosure

that may be of sufficient magnitude to

constitute a risk of electric shock to

persons.

Afin d'écarter tout risque d'électrocution, garder le coffret

fermé. Ne confier l'entretien de l'appareil qu'à un

personnel qualifié.

Per evitare scosse elettriche, non aprire l'apparecchio. Per

le riparazioni rivolgersi solo a personale qualificato.

Para evitar descargas eléctricas, no abra la caja. En caso de

averia, solicite los servicios de personal cualificado

solamente.

To prevent fire or shock hazard, do not expose the

unit to rain or moisture.

To avoid electrical shock, do not open the cabinet.

Refer servicing to qualified personnel only.

This symbol is intended to alert the user to

the presence of important operating and

maintenance (servicing) instructions in the

literature accompanying the appliance.

For the customers in the Netherlands
Voor de klanten in Nederland

• Dit apparaat bebat voor memory back-up een batterij

die niet vervangen hoeft te worden tijdens de

levensduur van het apparaat.

• Raadpleeg uw leverancier indien na zeer intensief of

langdurig gebruik de batterij vervangen moet worden.

Om gevaar of schade door kortsluiting te voorkomen

mag de batterij alleen vervangen worden door

vakbekwaam servicepersoneel.

• Gooi de batterij niet weg maar lever deze in als klein

chemisch afval (KCA).

2

PRECAUTIONS

On safety (Refer to the supplied “WARNING”.)

•Should any liquid or solid object fall into the cabinet, unplug the unit and have it checked by qualified personnel before

operating it any further.

•Unplug the unit from the wall outlet if it is not to be used for an extended period of time. To disconnect the cord, pull it out

by grasping the plug. Never pull the cord itself.

On installation

•Do not install the unit in a location near heat sources such as radiators or air ducts, or in a place subject to direct sunlight,

excessive dust, mechanical vibration or shock.

•When mounting the unit on the EIA 19-inch standard rack, allow enough space of 1U or more above this unit for good

ventilation.

On operation

•Before making program source connections, be sure to turn the power switch off and unplug the unit.

•When the unit is not used, turn the power off to conserve energy and to extend the useful life of your unit.

On cleaning the cabinet

Clean the cabinet, panel and controls with a soft cloth lightly moistened with mild detergent solution. Do not use any type of

abrasive pad, scouring powder or solvent such as alcohol or benzine.

On repacking

Do not throw away the carton and the packing material. It makes an ideal container for transporting the unit.

When shipping the unit for repair work or to another location, repack it as it was.

If you have any questions or problems concerning your unit, consult your nearest Sony dealer.

3

4

1. OUTLINE

The SRP-L300 digital limiter/delay is provided with three signal processing algorithms.

(A) Dynamics algorithm
This algorithm consists of four independent blocks, that is, a compressor, gate/expander and limiter.
The compressor and expander can set the sensitivity of any frequency or three types of stereo links using a side
equalizer as well as setting parameters such as attack time, hold time, release time, and ratio. Moreover, various
dynamics controls can be carried out such as a Soft Knee function that can change the effect of the compressor or the
setting of the maximum attenuation in the gate/expander.

* You can use the Dynamic algorithm with simple delay.

(B) DAL-1000 algorithm
This algorithm performs the function of Sony digital recording limiter DAL-1000 with higher precision.
This algorithm can smoothly clip the peak level of a waveform while increasing the gain of a low-level signal at a
response rate free from time lag. This algorithm can also be used through combination of each delay.
(C) Tap delay algorithm
This is a 48-taps delay algorithm.
The delay time, level, and low-pass filter parameters can be set for each tap. The maximum delay time is 4.5 seconds.
This algorithm can be used for the simulation of reflected sound.

Excellent sound quality ensured by high-performance A/D and D/A converters

The SRP-L300 is provided for the dynamic range of 105 dB or more and the converter with 20-bits resolution high­precision sampling rate A/D and D/A converter system with 48 kHz sampling rate.

This enables a low noise and high sound quality

High-precision digital signal processing are carried out using a digital signal processing unit (DSP) with 52-bits
multiplication precision.

Digital input/output terminal conforming to the AES/EBU standard

Sampling rate converter with Jitter free

This sampling rate converter converts a digital input signal into a 48 kHz internal sampling frequency signal with
crystal precision and sends it to the digital signal processing block. This produces the effect below.

1 The sound quality improves due to correction of input signal control jitter with crystal precision.
2 The user can freely use the sampling frequency of a digital input signal.
3 The analog input signal that was converted from analog to digital in 48 kHz and 20 bits can be mixed with a

digital input signal.

In the input/output block, signals can be easily selected and switched as in analog/digital switching, mixing,
mono-mixing, and CH-1/CH-2 switching.

A maximum of 20 programs can be stored and instantaneously recalled.

A lock function is provided to protect the setting from accidental operation.

The Remote control operation using an RS-232C terminal is available.

The analog stacking output and digital through output are provided for signal distribution.

5

2. GLOSSARY

Algorithm

Parameter

Edit

Program

Digital signal, are processed according to a mathematical formula called an algorithm
in the digital signal processing unit. The SPR-L300 uses three different algorithms to
produce varying effects.

Several numerical values are used in the algorithmic formulas, each value is called a
“parameter”. The “delay time” or “threshold level” are examples.

The operation which changes a parameter value is called an “edit.”

A “program” in the SRP-L300 indicates the current processing state at that time, that
is, the setting state of the algorithm and parameters used.
A “preset program” and “user program” are available. The preset program is
preinstalled at the factory.
The user program is created for internal storage by the user.

Program recall and storage

Default display state

P01

In =

-

Sync

dBFS

DYNAMICS(A)

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

Always only one program is executed during operation. A program executed at that
time is called a “temporary program.” The temporary program has used for an edit.
What the edited temporary program is memorized in the internal memory circuit as a
user program is called storage.
What the stored user program or preset program reads from memory as a temporary
program is called a recall.

The program number, program name, and algorithm type (a,b. etc) in the upper row,
the level meter is displayed in the second row. Together, this is called “default display
state”.
In the default display state, the SRP-L300 waits for the user operation with the whole
operation state exited.
To return from the current state to the default display state, press the “EXIT/NO”
button several times.

The operation for changing CH-1 and CH-2 parameters together during editing is
called “sync.”
* No means of external sync

These are signal level unit in a digital signal. “FS” in dBFS is an abbreviation for “full
scale.” It is a decibel representation with the digital clip level as standard.
The SRP-L300 is equipped with digital input/output terminals as well as analog
input/output terminals. Therefore, “dBFS” is used as the absolute value of a signal
level when the parameter for digital signal processing is set. For the relation between
the analog and digital levels, refer to 5-2, “Level Diagram.”

6

3. CONTROLS AND FUNCTIONS

3-1. Front Panel

3

1

57 98 %#!

POWER

ON OFF

INPUT LEVEL

CH-1 CH-2

OVER

0

−12 +12

dB

2

−12 +12

dB

OUTPUT LEVEL

CH-1 CH-2

0

0

0

−12 +12

−12 +12

dB

dB

46

1 POWER button

This POWER button turns on and off the power of
the SRP-L300.
When the power is turned on, the back light on the
display screen lights and the previous signal
processing condition returns automatically.

2 INPUT LEVEL knobs (CH-1 and CH-2)

The INPUT LEVEL knobs are used to adjust the
level of the input signals from the analog input
terminals.
In the center position (0 dB), a internally head room
is 20 dB with respect to the input signal of a
reference level (+4 dBs).
For how to adjust these knobs, refer to 5-2, “Level
Diagram” and 5-3, “Unity Gain.”

INPUT

ANALOG

DIGITAL

PLL

CH-1

-

LIMITER / DELAY

36912151821242730

1

OVER/GR(dB)

CH-2

5 INPUT indicator

The input indicator selected by internal parameter
“Input Select” lights. In the analog and digital
mixing state, both the ANALOG and DIGITAL
lamps light.
For more details of the input selection, refer to 6-1,
“Input Block.”

6 PLL indicator

The PLL indicator indicates that a digital signal is
properly transmitted and that the SRP-L300 receives
it.
Moreover, this indicator indicates the existence of
physical transmission. The PLL indicator also lights
when a silent signal is being transmitted because it
is not related to the level of an audio signal.

ADJUST

−+

−+

PUSH ENTER/YES

SELECT

EDIT PROGRAM

SYNC EXIT/NO

DIGITAL LIMITER/DELAY SRP-L300

"$&

LOCK

BYPASS

3 OVER indicators (CH-1 and CH-2)

The OVER indicators light when signals exceeding
the maximum input level are input from the analog
input terminals.
Actually, the OVER indicators light from the level
slightly lower than the level in which a signal is
clipped.
Decrease the level using the INPUT LEVEL knobs
when they light frequently.

4 OUTPUT LEVEL knobs (CH-1 and CH-2)

The OUTPUT LEVEL knobs are used to adjust the
level of the output signals from the analog output
terminals.
In the center position (0 dB), the digital full scale
output signal for digital signal processing is output
in a level of +24 dBu.
To adjust these knobs, refer to 5-2, “Level Diagram”
and 5-3, “Unity Gain.”

Note

“PLL” is an abbreviation for Phase-Locked Loop.
The circuit that operates in synchronization with a
digital input signal is called a PLL circuit. The PLL
indicator lights when the PLL circuit operates
normally.

7 Display

The display is used the user setting state or level

meter with a character display of 16 characters × 2

lines.
The back light goes on when the power is turned on.

8 SELECT knob and SELECT (ENTER/YES)

button

Operate the knob and button as described below if
necessary.

Turn clockwise or counterclockwise.
Press.

Turn while pressing and holding.
The meaning of the operation varies depending on
the state at that time.

7

Turn the knob and button to select various items.
Press them to enter the contents of selection or to
enter “YES” for a question from the system.
In this manual, the “SELECT” knob is used for
rotation operations, and the “SELECT” button for
pressing operations.

9 ADJUST knob and ADJUST button

The knob and button are mainly used to adjust the
parameter value during edit operation.
In this manual, the “ADJUST” knob is used for
rotation operations, and the “ADJUST” button for
pressing operations.
To recall the last displayed parameter again, press
the ADJUST button. The user can then immediately
start the edit operation.
For more details, refer to 7-1, “Basic Edit
Operation.”

!º EDIT button

Press this button to set and change the parameter of
a signal processing block. The “EDIT state” is then
entered.

!¡ SYNC button and SYNC indicator

The SYNC button is used to determine whether to
interlock the CH-1 and CH-2 parameters during
parameter setting and change.
For more details, refer to 7-2, “SYNC.”

!™ PROGRAM button

Press this button to recall a program from memory
or store it.

!£ EXIT/NO button

Press this button to exit the current state or return
the operation procedure by one step.
This button is also used to enter “NO” for a question
from the system.

!¢ LOCK button and LOCK indicator

Press this button to lock the operation of the
SRP-L300 and to prevent the state at that time from
being changed easily.
The LOCK indicator lights when the SRP-L300 is
locked.
For more details of the “LOCK” function, refer to
the “LOCK Function” in Section 9.

!∞ BYPASS button and BYPASS indicator

The BYPASS button is used to switch the output
signals of a non-signal processed sound (bypass
state) and signal processed sound.
The BYPASS indicator lights in the bypass state.

8

3-2. Rear Panel

574

R

REMOTE(RS-232C)

1 ANALOG INPUT terminals (CH-1 and CH-2)

Analog audio signals are input to the ANALOG
INPUT terminals.
(The terminal is XLR-3-31.)
Electronic balancer circuit
(1: GND, 2: HOT, 3: COLD)

2 ANALOG STACKING terminals (CH-1 and CH-

2)

The ANALOG STACKING terminals are directly
connected to the ANALOG INPUT terminals. These
terminals are used to input the analog input signal
of the SRP-L300 to other equipment.
(The terminal is XLR-3-32.)
Electronic balancer circuit
(1: GND, 2: HOT, 3: COLD)

3 ANALOG OUTPUT terminals (CH-1 and CH-2)

The analog signals after signal processing are output
from the ANALOG OUTPUT terminals.
(The terminal is XLR-3-32.)
Electronic balancer circuit
(1: GND, 2: HOT, 3: COLD)

4 DIGITAL IN terminal

Digital audio signals based on the AES/EBU format
are input to the DIGITAL IN terminal.
(The terminal is XLR-3-31.)

THRU IN OUT

DIGITAL I/O ANALOG OUTPUT ANALOG INPUT

6

PUSH PUSH PUSH

3

CH-2 CH-2CH-1 CH-1

1

2

CH-2 CH-1

STACKING

5 DIGITAL THRU (digital through output)

terminal

The DIGITAL THRU terminal is used to input the
digital input signal of the SRP-L300 directly to other
equipment.
Since signals are output through an internal buffer,
they can also be input to multiple SRP-L300s via
series connection.
However, no signal is output when the power is
turned off. (The terminal is XLR-3-32.)

6 DIGITAL OUT terminal

The digital signal after signal processing is output
from the DIGITAL OUT terminal.
The digital output signal conforms to the AES/EBU
format.
The sampling frequency is 48 kHz.
(The terminal is XLR-3-32.)

Note

For more details of the digital input and output, refer to
the “Digital Input and Output” in Section 10.

7 REMOTE terminal

The REMOTE terminal is used to control the
SRP-L300 from a remote location using a personal
computer.
Use an RS-232C signal of 9600 bps during
communication (9-pin D-sub (male)). This connecter
is adapted for PC remote terminal with cross cable.
Please consult a Sony dealer for the communication
protocol.

9

4. BASIC OPERATION

The flow of basic operation is described below.
For more details of each operation, refer to the corresponding pages.

1 Recall one of the P01, P02, and P03 preset programs corresponding to the

algorithm used.

For the algorithm, refer to page 13.
For the recall operation, refer to page 32.

2 Execute the edit operation (change the parameter) and change the effect.

For the edit operation, refer to page 25.

3 Store the created program.

For the store operation, refer to page 33.

Reference

Each preset program is used as a program of the algorithm below.

P01 (A) Start program of the dynamics algorithm

(B)

P02
P03 (C) Start program of the tap delay algorithm

The three programs are the source of program creation based on each algorithm. These programs are
based on a parameter that gives no effect when they are recalled.
The programs that were created in advance have been installed in P04 or later preset programs. These
preset programs can also be recalled or modified in parameter before use.

Start program of the DAL-1000 algorithm

10

5. INTERNAL SIGNAL FLOW

5-1. Block Diagram (Including the A/D, D/A, and DIO Blocks)

The signal flow in the SRP-L300 is shown in the figure below.

CH-1

STACKING

CH-2

ANALOG INPUT

THRU

DIGITAL I/O

CH-1

CH-2

A/D

INPUT LEVEL

IN

Decoder

Sampling
Rate
Converter

Digital

*

Signal
Processing
Block

Digital
Filter

D/A

D/A

OUTPUT LEVELOVER

ANALOG OUTPUT

DIGITAL OUTPUT

Encoder

CH-1

CH-2

LCD
Display

CPU

SW
Rotary Encoder

Memory

(Level meter)

• For the digital signal processing block marked with “*”, refer to the “Digital Signal Processing Block” in Section 6.

• For the fetch position of each level meter, refer to the block diagrams in “Digital Signal Processing Block” in Section 6.

• A digital output signal is always the same as the output signal of a D/A converter.

5-2. Level Diagram

In the digital area, “dBFS” (dB value with the full scale as standard) is used as the absolute
value unit of a level. The level relation between analog and digital signals is shown in the
figure below.

INPUT OUTPUT LEVEL OUTPUT

+24dBu

INPUT LEVEL

A/D D/ADigital signal precessing

Analog area Digital area Analog area

8dB

+12dB

20dB

INPUT
LEVEL

0dBFS 0dBFS

-8dBFS

OUTPUT
LEVEL

+12dB

+24dBu

+16dBu

REMOTE
(RS-232C)

+4dBu

-12dB

0dB

-20dBFS -20dBFS

-32dBFS

-12dB

0dB

+4dBu

-8dBu

An analog input signal of +4 dBu is converted into a digital signal of –20 dBFS when the
INPUT LEVEL knobs are set to 0 dB. A digital output signal of –20 dBFS is converted into
an analog input signal of +4 dBu when the OUTPUT LEVEL knobs are set to 0 dB.

11

5-3. Input and Output Level Adjustment

The SRP-L300 has the input and output level knobs for analog input/output adjustment.
Each level can also be controlled in the input, main, and output blocks of a digital signal
processing unit. These blocks are described below.

1 Main block of digital signal processing unit

The level control during signal processing, that is, the gain reduction by compressor
and expander operation or the corresponding gain making is collectively carried out in
this block.

2 Level adjustment in input and output blocks of digital signal processing unit

This level is usually set to 0 dB (unity gain) during use.
It is recommended to use when the user wants to change only the level when the main
block of the existing program is diverted.
The level adjustment corresponding to the analog level adjustment knob can be carried
out in these blocks when digital input and output signals are used.

3 INPUT LEVEL knobs

The INPUT LEVEL knobs are basically set to 0 dB during use. These knobs are
adjusted to reduce the head room during A/D and D/A conversion and to fully show
the performance of the conversion block when the input level differs from the
reference input level (+4 dBu) of the SRP-L300 or when the signal (e.g., Playback signal
of recording media) whose maximum level can be predicted is input.
(The adjustment value of the INPUT LEVEL knobs can be confirmed by the display on
an input level meter.)

Notice

During setting for head room reduction, the input/output unity gain can be maintained by
decreasing the output level proportionally to the same click as for the input level.

INPUT LEVEL

CH-1 CH-2

OVER

0

−12 +12

dB

0

−12 +12

dB

OUTPUT LEVEL

CH-1 CH-2

0

−12 +12

dB

0

−12 +12

dB

4 OUTPUT LEVEL knobs

The OUTPUT LEVEL knobs are mainly used to correct the output level when the
INPUT LEVEL knobs are changed.
In the output level, however, the adjustment value of the OUTPUT LEVEL knobs is
not reflected on the output level meter display. Therefore, the adjustment value of the
knobs must be added (or subtracted) to the display level of the output level meter.
(Analog output dBu value) = (Digital dBFS value) + 24 + (knob adjustment position
value dB)

Note

For the digital signal processing block, refer to the “Digital Signal Processing Block” in Section 6. For
the level meter, refer to 6-5, “Level Meter Display.”

12

6. DIGITAL SIGNAL PROCESSING BLOCK

CH-1
CH-2

Main block

CH-1
CH-2

CH-1
CH-2

CH-1
CH-2

CH-1

CH-2

CH-1

CH-2

ANALOG INPUT

DIGITAL INPUT

CH-1 OUTPUT
CH-2 OUTPUT

Input
block

Output
block

Bypass

The SRP-L300 mounts the following three signal processing algorithms.

(A) Dynamics algorithm
(B) DAL-1000 algorithm

(C) Tap delay algorithm
As shown below, the three algorithms contain input, output, and bypass blocks in
common with one another.
Only the main block between the input block and bypass block differs for each algorithm.
The contents of signal processing and parameters are described next for every block.

Signal processing block diagram

Note

Each parameter is described in the order below.

Parameter name

Parameter function

Variable range of parameter

For how to change the parameter, refer to the “Parameter Change” in Section 7.

13

6-1. Input Block

The input block selects input signals and adjusts the level of the input signals.

Parameter

ANALOG INPUT

DIGITAL INPUT

{
{

CH-1
CH-2

CH-1
CH-2

1D-IN Level

2Input Select

3Input Level

TO MAIN BLOCK
CH-1

TO MAIN BLOCK
CH-2

TO INPUT LEVEL METER

}

1 D-IN Level

This parameter sets the adjustment of a digital input level

–30.0 dB to +12.0 dB (in units of 0.5 dB).

2 Input Select

This parameter selects input signals.

Analog Normal An analog input signal is used.

Digital Normal A digital input signal is used.

Ana + Dig Normal Analog and digital input signals are mixed for use.

(The signals in CH-1 and CH-2 are mixed with each other.)

Analog CH-1 The analog input signal in CH-1 is input to both CH-1 and

CH-2 of a main block for use.

Analog CH-2 The analog input signal in CH-2 is input to both CH-1 and

CH-2 of a main block.

Analog Mono Mix The analog input signals in CH-1 and CH-2 are mixed and

input to both CH-1 and CH-2 of a main block for use.

Digital CH-1 The digital input signal in CH-1 is input to both CH-1 and

CH-2 of a main block for use.

Digital CH-2 The digital input signal in CH-2 is input to both CH-1 and

CH-2 of a main block for use.

Digital Mono Mix The digital input signals in CH-1 and CH-2 are mixed and

input to both CH-1 and CH-2 of a main block for use.

The “INPUT” indicator on the panel lights corresponding to the selected input signal.

3 Input Level

This parameter sets the last level adjustment after input signals are selected

– ∞, –60.0 to 0.0 dB (in units of 0.5 dB).

14

6-2. Bypass Block

BYPASS ON
BYPASS OFF

FROM INPUT BLOCK CH-1

FROM MAIN BLOCK CH-1

FROM MAIN BLOCK CH-2

FROM INPUT BLOCK CH-2

OUTPUT BLOCK TO CH-1

OUTPUT BLOCK TO CH-2

This block switches using the “BYPASS” button on the front panel.
However, the switching is not contained as a parameter in the program.

6-3. Output Block

Parameters

CH-1

FROM BYPASS BLOCK

CH-2

2 OUTPUT LEVEL1 OUTPUT MODE

CH-1 OUTPUT

CH-2 OUTPUT

TO OUTPUT LEVELMETER

}

This block switches output signals and adjusts the level of the output signals.
The same contents of data are always output to the analog and digital output terminals.

1 Output Mode

This parameter switches or mixes the two output (CH-1/CH-2) signals of a main block
(Mode setting).

Normal The CH-1 signal of a main block is output to the CH-1 output

terminal, and the CH-2 signal is output to the CH-2 output

terminal.
Cross The CH-1 and CH-2 signals from a main block are switched.
Mono CH-1 The CH-1 signal from a main block is output to both the CH-1

and CH-2 output terminals.
Mono CH-2 The CH-2 signal from a main block is output to both the CH-1

and CH-2 output terminals.
Mono Mix The CH-1 and CH-2 signals from a main block are mixed and

output to both the CH-1 and CH-2 output terminals.

2 Output Level (CH-1/CH-2/SYNC)

This parameter sets the last output level adjustment

– ∞, –60.0 to 0.0 dB (in units of 0.5 dB).

15

6-4. Main Block

6-4-1. (A) Dynamics algorithm

The dynamics algorithm consists of four independent blocks; a compressor, gate/
expander, limiter, and delay.

(Processing block diagram in CH-1. (The processing block diagram
in CH-2 is same as for CH-1.))

FROM INPUT BLOCK

CH-1
CH-2

1Trigger

Compresser

!•Dynamics Delay

Delay

On/Off SIDE EQ Level detection

2On/Off

5-1 EQ type
5-2 EQ Freq
5-3 EQ Level

3Attack
4Release

Gain reduction /
calculation

6Threshold
7Ratio
8Soft knee Level

!ªDynamics

Level

@ºOn/Off
@¡Threshold

Limiter

Delay

@™Delay

To limiter GR
level meter

To dynamics GR
level meter

Parameters in compressor

Gain reduction /
calculation

!∞Threshold
!§Ratio
!¶Maximam

Gain Reduction

9Trigger

Expander / gate

On/Off SIDE EQ Level detection

!ºOn/Off

!¢-1 EQ type
!¢-2 EQ Freq
!¢-3 EQ Level

!¡Attack
!™Hold
!£Release

1 COMPRESSOR Trigger

This parameter determines the trigger signal of the compressor operation. It also can
set the stereo link operation.

SEPARATE The two-channel signals input to a main block are used as a

trigger signal of each channel.

LINK (MIX) The signal obtained when the two-channel signals input to a

main block are mixed 50% at a time is used as a trigger signal.

LINK (CH-1) The CH-1 signal input to a main block is used as trigger

signals in both processing channels.

LINK (CH-2) The CH-2 signal input to a main block is used as trigger

signals in both processing channels.

2 COMPRESSOR On/Off

This parameter sets the compressor on/off operation.

ON/OFF

3 COMPRESSOR Attack

This parameter sets the attack time of compressor operation.

AUTO 0.1 to 1000 [msec]
The attack time is automatically switched according to the input signal level when the
parameter is set to AUTO. A quick attack time is gradually switched for sudden rising
of a high-level signal, and a slow attack time for low fluctuations.

16

4 COMPRESSOR Release

This parameter sets the release time of the compressor operation.

AUTO, 47 to 4700 [msec]
The release time is automatically switched according to the input signal level when the
parameter is set to AUTO.

5 COMPRESSOR Side EQ

An equalizer is used for the trigger signal of the compressor operation. This parameter
sets the frequency sensitivity of the compressor operation.

5-1 COMPRESSOR Side EQ Type

This parameter selects the type of equalizer.

OFF/HPF/LPF/BPF/PEAKING

5-2 COMPRESSOR Side EQ Frequency

This parameter selects the frequency of an equalizer.

The frequency of an equalizer cannot be set when the type of

equalizer is OFF.

200/250/315/400/500/630/800/1k/1.25k/1.6k/2k/2.5k/3.15k/4k/5k/6.3k/8k/

10k/12.5k/16k [Hz]

5-3 COMPRESSOR Side EQ Level

The level of an equalizer is set when the type of equalizer is PEAKING.

It cannot be set when the type of equalizer is other than PEAKING.

–10/–8/–6/–4/–2/0/+2/+4/+6/+8/+10 [dB]

∗ Q of a bandpass filter is 4.0 fixed.

∗ Q of a peaking filter is 1.0 fixed.

∗ The sync switching in the three parameters of an equalizer is collectively carried

out by “Type.”

6 COMPRESSOR Threshold

This parameter sets the level in which the compressor operation is initiated
0 to –60 [dBFS] (in units of 1 dBFS).

7 COMPRESSOR Ratio

This parameter sets the compression ratio of compressor operation.

1.0 to –α [:1]

8 COMPRESSOR Soft Knee Level

This parameter sets the compressor operation, that is, the range of change in soft knee.
Compression is initiated from the level lower than the set threshold level in proportion
to the soft knee level.
As the set value becomes lower, the soft knee comes nearer the “hard knee” .

1 to 18 [dB] (in units of 1 dB).

Parameters in expander/gate

9 EXPANDER Trigger

This parameter determines the trigger signal of expander/gate operation. It also can
set the stereo link operation.

SEPARATE The two-channel signals input to a main block are used as a

trigger signal of each channel.

LINK (MIX) The signal obtained when the two-channel signals input to a

main block are mixed 50% at a time is used as a trigger signal.

LINK (CH-1) The CH-1 signal input to a main block is used as trigger

signals in both processing channels.

LINK (CH-2) The CH-2 signal input to a main block is used as trigger

signals in both processing channels.

17

!º EXPANDER On/Off

This parameter sets the expander/gate ON/OFF operation.

ON / OFF

!¡ EXPANDER Attack

This parameter sets the attack time of the expander/gate operation.

0.1 to 1000 [msec]

!™ EXPANDER Hold

This parameter sets the hold time of the expander/gate operation.

47 to 4700 [msec]

!£ EXPANDER Release

This parameter sets the release time of the expander/gate operation.

47 to 4700 [msec]

!¢ EXPANDER Side EQ

An equalizer is used for the trigger signal of the expander/gate operation. This
parameter sets the frequency sensitivity of the expander/gate operation.

!¢-1 EXPANDER Side EQ Type

This parameter selects the type of equalizer.
OFF / HPF / LPF / BPF / PEAKING

!¢-2 EXPANDER Side EQ Frequency

This parameter selects the frequency of an equalizer.
The frequency of an equalizer cannot be set when the type of equalizer is OFF.
200/250/315/400/500/630/800/1k/1.25k/1.6k/2k/2.5k/3.15k/4k/5k/6.3k/8k/
10k/12.5k/16k [Hz]

!¢-3 EXPANDER Side EQ Level

The level of an equalizer is set when the type of equalizer is PEAKING.
It cannot be set when the type of equalizer is other than PEAKING.
–10/–8/–6/–4/–2/0/+2/+4/+6/+8/+10 [dB]

∗ Q of a bandpass filter is 4.0.
∗ Q of a peaking filter is 1.0.
∗ The sync switching in the three parameters of an equalizer is collectively carried

out by “Type.”

!∞ EXPANDER Threshold

This parameter sets the level in which the expander/gate operation is initiated.
The gain is reduced in a level of less than the set level

–10 to –90 [dBFS] (in units of 1 dBFS).

!§ EXPANDER Ratio

This parameter sets the compression ratio of expander/gate operation.

1.0 to 16 [1:]

!¶ EXPANDER Maximum Gain Reduction

This parameter sets the maximum attenuation value (dB) during expander/gate
operation.
The gain of more than this value is not reduced irrespective of the setting of other
parameters

–2 to –60 [dB] (in units of 2 dB).

18

Parameters related to compressor and expander/gate

!• DYNAMICS Delay

This parameter sets the delay time in a compressor and expander.
A “zero attack” can be virtually carried out by setting the delay time corresponding to
the attack time.

0.0 to 500.0 msec

!ª DYNAMICS Level

This parameter sets gain-make value in a compressor and expander.
The compressor and expander perform only the gain reduction. Therefore, the
parameter adjusts the whole level

0.0 to +40.0 dB (in units of 0.5 dB).

Parameters in limiter

@º LIMITER On/Off

This parameter sets the limiter ON/OFF operation.

ON / OFF

@¡ LIMITER Threshold

This parameter sets the level in which the limiter operation is initiated.

0 to –30 dBFS (in units of 1 dBFS)

∗ The limiter operates for the gain-make signal in a dynamics level.

The limiter should be used to suppress a suddenly excessive signal. Avoid using it
in the state where the limiter operates continuously. This causes distortion. (The
operation can be confirmed using the gain reduction meter of a limiter.)

@™ Parameters in Delay

This parameter sets the delay time:

0.000 to 4000.000 msec.

The change in the level obtained by (A) DYNAMICS algorithm is shown in the figure
below.

Expander/Gate Threshold

Dynamics Level

Maximum Gain Reduction

Expander/Gate Ratio

Input [dBFS]

Limiter Threshold

Compressor Threshold

Compresser Ratio

(Soft Knee Range)

Soft Knee Level

0

Output [dBFS]

19

6-4-2. (B) DAL-1000 algorithm

This is an algorithm for which the Sony digital audio limiter (DAL-1000) was
implemented. The algorithm can raise the average level of a digital signal in which the
head room was ensured to prevent a hard clip from occurrence and that was converted
from analog to digital in a lower level.
This algorithm is a soft clipper. In other words, the algorithm increases the gain in a low
level while operating the waveforms at a time delay-free response rate peculiar to the
digital processing. It also smoothly clips almost the same level as for a full case.

Output level [dBFS]

0

-10

-20

TypeA(100%) Nonlinear area

3.5dB

6dB

TypeB(100%)

TypeA.B(0%)

Nonlinear

area

-30
Input level [dBFS]

0-10-20-30

Selection of type

• In this algorithm, types A and B, whose effects differ, can be selected.

• Types A and B differ in the level where the gain and clip in a linear area are initiated.

• Type A is suitable for setting a high gain for the low-level source.

However, notice that the distortion during clipping also increases when the input level
becomes high.

• Type B is lower in gain than type A, but it has less distortion.

Setting of ratio

• The level of an effect can be changed using the parameter of a ratio.

• The maximum effect is obtained when a ratio is 100%. No effect is obtained when it is

0%.

• The gain in linear areas also changes when a ratio changes.

Output level[dBFS]

0

–10

Type 100%

0%

–20

6dB

Retio 70%

4.6dB

20

–30

Input level[dBFS]

0–10–20–30

CH-1

FROM INPUT BLOCK

CH-2

DAL-1000 processing

DAL-1000 processing

Delay

Delay

CH-1

TO BYPASS BLOCK

CH-2

Parameters

1 DAL Type

This parameter specifies whether to set the type to A or B.

2 DAL Ratio

This parameter sets the amount of a DAL effect:

Note: The “% value” and the “gain dB value in a linear area” are displayed in a row.

3 Level

This parameter adjusts the level:

4 Delay

This parameter sets the delay time:

6-4-3. (C) Tap delay algorithm

This is a 48-taps delay algorithm.
The parameter for delay time, levels, low-pass filters, or polarity inversion can be set for
each tap.
This algorithm can be used for the simulation of reflected sound.

1 DAL Type
2 DAL Ratio

TYPE A / TYPE B

0 to 100% (in units of 1%).

0.0 to –12.0 dB (in units of 0.5 dB).

0.000 to 4000.000 msec.

3Level

4Delay

From input block

1Pre Delay

4-1 Tap(No) Delay
4-2 Tap(No) Level
4-3 Tap(No) LPF/Ø

3Direct Level

Pre Delay Delay Line

2Delay Level

Tap parameters

Tap01

RPF/Ø

RPF/Ø

Tap02

Tap03

Tap04

Tap45

Tap46

Tap47

To bypass block

Tap48

21

Parameters

1 Pre Delay

This parameter sets the pre-delay time that collectively delays only the delay sound:

0.000 to 500.000 msec.

2 Delay Level

This parameter sets the level of the whole delay sound when the original sound is
mixed with the delay sound:

–∞, –60 to 0 dB (in units of 0.5 dB).

3 Direct Level

This parameter sets the level of the original sound when the original sound is mixed
with the delay sound:

–∞, –60 to 0 dB (in units of 0.5 dB).

4 Parameters for each tap (No. 1 to 48)

Tap (No.) Delay

This parameter sets the delay time of each tap:

0.000 to 4000.000 msec.

Tap (No.) Level

This parameter sets the level of each tap:

–∞, –60 to 0 dB (in units of 0.5 dB).

Tap (No.) LPF/0

This parameter sets the low-pass filter or polarity inversion effect of each tap:

Inverse/Normal/16k/12.5k/10k/8k/6.3k/5k/4k/3.15k/2.5k/2k/1.6k/1.25k/1k/
800/630/500/400 [Hz].

Normal : No effect is set to the delay sound.
Inverse : The delay sound is inverted in polarity.
When the frequency display is selected, the low-pass filter of the cut-off frequency is set.

22

6-5. Level Meter Display

The level meter is displayed on the liquid-crystal display (LCD) screen.
The scale has been printed on the frame of the screen.

P01

In =

DYNAMICS(A)

-

1

36912151821242730

CH-1
CH-2

OVER/GR(dB)

LIMITER / DELAY

The level meter of the SRP-L300 is a peak meter based on a digital signal.
It has a peak hold function of about one second. Moreover, the level meter with contents
below can be switched and displayed.
(For the fetch position of each level, refer to the diagram for signal processing.)

INPUT LEVEL (Display IN)

Displays the level of an output signal (signal input to a main block) in the input
block.
The level is displayed in units of dB with the digital full scale as standard.

OUTPUT LEVEL (Display OUT)

Displays the level of an output signal in the output block.
The level is displayed in units of dB with the digital full scale as standard.

Dynamics Gain Reduction (Display DGR) Displays the total level of the gain

reduction in a compressor and expander only when a (A) DYNAMICS
algorithm is used.
The GR segment on the right end lights when gain reduction of less than 1 dB
occurs.

Limiter Gain Reduction (Display LGR) Displays the level of the gain reduction in a

limiter only when a (A) DYNAMICS algorithm is used.
The GR segment on the right end lights when gain reduction of less than 1 dB
occurs.

Selection of level meter type

The displayed level meter is selected by rotating the “SELECT” knob in the default
display state.

SELECT

−+

PUSH ENTER/YES

(A) DYNAMICS algorithm

In (INPUT)

↑↓

Out (OUTPUT)

↑↓

DGR(Dynamics Gain Reduction)

↑↓

LGR(Limiter Gain Reduction)

↑↓

In (INPUT)

(B) DAL-1000 algorithm
(C) Tap delay algorithm

In (INPUT)

↑↓

Out (OUTPUT)

23

Level meter display function during edit operation

SELECT

−+

This function is used to check each level at a particular point during an edit operation.

Press the “SELECT” button during edit operation.

≥

PUSH ENTER/YES

Press.

SELECT

−+

The level meter is displayed while the "SELECT" button is pressed.

The edit operation is returned when the button is released.
Turn the “SELECT” knob while pressing it with the SELECT button pressed.

≥

The contents of the meter display are switched. (To cancel the display and return to

PUSH ENTER/YES

Rotate while pressing.

Relation between the display value of an input/output level meter and the actual input/output level

the edit operation, stop pressing the EDIT button.)

1 When a digital input/output signal is used;

The level meter displays each value according to the value of an internal digital signal.
Therefore, the display value of the level meter completely corresponds to the input/
output level.

2 When an analog input/output signal is used;(Refer to 5-2, "Level Diagram".)

The input/output level meter of the SRP-L300 displays the peak value in units of
“dBFS” with the digital full scale as standard. It differs from a general VU scale or
dB scale.

For sine waveforms, the conception for converting peak value “dBFS” in a digital
area into effective value “dBu” in an analog area is described below. (The
correction corresponding to the adjustment value of the INPUT/OUTPUT LEVEL
knobs is required.)

(1) When the “INPUT LEVEL knobs” and “OUTPUT LEVEL knobs” are set to 0 dB:

the (Analog dBu value) = (Digital dBFS value) + 24
For example, –20 dBFS = +4 dBu (= 0 VU)

(2) When the “OUTPUT LEVEL knobs” are adjusted:

(Analog output dBu value) = (Digital dBFS value) + 24 + (Knob adjustment
position dB)
For example, the output signal level is –21 + 24 - 12 = –9 dBu when the output level
meter is –21 dBFS and when the knob is set to -12 dB.

(3) When the “INPUT LEVEL knobs” are adjusted:

(Analog input dBu value) = (Digital dBFS value) + 24 – (Knob adjustment position
dB)
For example, the input signal level is -9 + 24 – 12 = +3 dBu when the input level
meter is –9 dBFS and when the knob is set to +12 dB.

Notes

• The level meter of the SRP-L300 displays the peak value based on a digital signal. Therefore, the
user may feel that the display level is higher than for the effective value display or VU meter value.

• In the input/output level meter, the adjustment value of the INPUT LEVEL knobs is reflected on
the input level meter after A/D conversion because of its’ digital signal's level display. However,
the adjustment value of the OUTPUT LEVEL knobs after D/A conversion is not reflected on the
output level meter.

24

7. PARAMETER CHANGE

The effect of sound can be changed by changing the parameter value while monitoring the
liquid-crystal display. This operation is called “edit.” The range or unit of a change value
in these parameters differs.
However, the procedure for change is almost the same. The basic procedure of the edit is
described next.
(For the type of parameters, refer to the “Signal Processing Block” in Section 6.)

Note

No algorithm can be changed by the edit operation.

7-1. Basic Procedure of Edit Operation

EDIT

A Press several times.

EDIT

B Turn.

SELECT

−+

PUSH ENTER/YES

SELECT

−+

PUSH ENTER/YES

SELECT

−+

PUSH ENTER/YES

Press the “EDIT” button to initiate the edit operation.

≥

Specify the block of the parameter to be changed in procedure A or B below.

A. Press the “EDIT” button several times until the

P01 DYNAMICS(A)

INPUT BLOCK

-

P01 DYNAMICS(A)

MAIN BLOCK

-

1

36912151821242730

1

36912151821242730

CH-1
CH-2

OVER/GR(dB)

CH-1
CH-2

OVER/GR(dB)

desired block name blinks.

B. Turn the “SELECT” knob until the desired block

P01 DYNAMICS(A)

OUTPUT BLOCK

-

CH-1
CH-2

1 OVER/GR(dB)36912151821242730

name blinks.

≥

Press the “SELECT” button when the desired

D-IN Level <SYNC

0.0 [dB]

-

1

36912151821242730

OVER/GR(dB)

≥

InputSelect<
Ana+Dig Normal

-

1

36912151821242730

OVER/GR(dB)

parameter block is displayed.
The desired block is displayed.

CH-1
CH-2

The first parameter is then displayed. Turn the
“SELECT” knob and select the parameter to be
changed.
Turn the “SELECT” knob to sequentially display the
parameter name (upper) and current parameter state

CH-1
CH-2

(lower).

ADJUST

−+

≥

InputSelect<

Analog Normal

-

*P01 DYNAMICS(A)
In =

-

CH-1
CH-2

1 OVER/GR(dB)36912151821242730

CH-1
CH-2

1 OVER/GR(dB)36912151821242730

Turn the “ADJUST” knob to change the parameter
state.
The display is reflected in the sound as soon as it is
changed. (The “ENTER” operation is not required
after the value is changed.)

Note

The “＊” mark has been assigned to the beginning of a

program number when the default state is returned
with the parameter value changed. This indicates that
the current state is changed from the recall state. The

“＊” mark disappears when the program is stored.

25

To change the lastly displayed parameter again



The user can skip to the edit state of the latest displayed parameter by pressing the button

ADJUST

−+

only once even if other operations are executed after parameter setting or even if the
default display state is returned by the “EXIT” operation.

In the default display state, press the “ADJUST” button.

Notes

• After the edit screen is entered, the subsequent operation is the same as the normal
operation.

• The first parameter in a main block is recalled immediately after recall operation.
However, when other parameters are displayed, the first parameter is used as the last
parameter next time.

26

7-2. Sync

7-2-1. Sync

The SRP-L300 has two channel input/output terminals and processes internal signals for
each channel. The operation for interlocking the parameters in two processing channels
for change is called sync. The parameter to be changed at that time is called a sync
parameter.

The “SYNC” button is used to determine whether to execute the sync operation for each
parameter during editing.
However, some internal parameters for signal processing are not related to the sync
operation. For the parameter not related to the sync operation, one parameter is
collectively related to both CH-1 and CH-2. (Example: Input Select)

The parameter related to the sync operation can be changed by one of the two methods
below.

- Synchronize the parameter and change it.

- Change the CH-1 and CH-2 parameters separately without synchronizing them.

7-2-2. Treating the sync parameter

The synchronized parameter is treated as one parameter. The non-synchronized
parameter is separately treated as CH-1 and CH-2 parameters.

The display indicating whether a parameter is synchronized appears at the back of the
parameter name on the display screen below and on the indicator of the “SYNC” button.

a) Parameter name <SYNC : CH-1 and CH-2 parameters exist and are synchronized.

(The indicator lights.)

b) Parameter name <CH-1 : CH-1 and CH-2 parameters exist, and the “CH-1” parameter

is displayed. (The parameter is not synchronized.) (The
indicator goes off.)

c) Parameter name <CH-2 : CH-1 and CH-2 parameters exist, and the “CH-2” parameter

is displayed. (The parameter is not synchronized.) (The
indicator goes off.)

d) Parameter name < : This parameter is related to both channels from the

beginning. There is no distinction between CH-1 and CH-2
parameters. (The indicator goes off.)

The “SYNC” button is activated for the parameters in steps a) to c) above. This button can
set whether to synchronize these parameters.
The parameter in step d) is not related to the sync operation. Therefore, the “SYNC”
button is not activated.

27

7-2-3. How to use the SYNC button

1. To set CH-1 and CH-2 parameters separately with the parameters synchronized currently

SELECT

−+

PUSH ENTER/YES

SYNC

SELECT

−+

PUSH ENTER/YES

ADJUST

−+

∫

InputLevel <SYNC

0.0 [dB]

-

1

OVER/GR(dB)

36912151821242730

≥

InputLevel <CH-1

0.0 [dB]

-

1

OVER/GR(dB)

36912151821242730

≥

InputLevel <CH-2

0.0 [dB]

-

1

OVER/GR(dB)

36912151821242730

Turn the “SELECT” knob to display “parameter name
<SYNC” during edit operation. (The SYNC indicator

CH-1
CH-2

lights.)

Press the “SYNC” button. “Parameter name <CH-1” is
then displayed. (The SYNC indicator goes off.) Next,

CH-1
CH-2

turn the “ADJUST” knob to change the CH-1
parameter.

Turn the “SELECT” knob clockwise once again to
display “parameter name <CH-2”. Next, turn the

CH-1
CH-2

“ADJUST” knob to change the CH-2 parameter.

2. To synchronize parameters with the parameters set separately

SELECT

−+

PUSH ENTER/YES

InputLevel <CH-1

-1.0 [dB]

-

1

OVER/GR(dB)

36912151821242730

InputLevel <CH-2

-2.0 [dB]

-

1

OVER/GR(dB)

36912151821242730

Turn the “SELECT” knob to display “parameter name
<CH-1” or “parameter name <CH-2” during the edit

CH-1
CH-2

operation. Next, press the “SYNC” button.

CH-1
CH-2

≥

SYNC

InputLevel <SYNC

-1.0 [dB]

-

Note

The parameter value in one channel is erased when separate parameters are used as a
sync parameter.

1

OVER/GR(dB)

36912151821242730

The CH-1 value is used as a sync parameter value
(irrespective of the CH-2 value) when the display is

CH-1
CH-2

shifted from CH-1 to SYNC. “Parameter name
<SYNC” is then displayed.
The CH-2 value is used as a sync parameter value
(irrespective of the CH-1 value) when the display is
shifted from CH-2 to SYNC. “Parameter name
<SYNC” is then displayed.
(The SYNC indicator lights.)

28

7-3. Editing of Delay Time

Note

•The delay parameter is a value that does not contain the minimum delay time when an
analog input/output signal is used.
An output signal is delayed with respect to the input signal by 1.416 msec (68 samples)
even if the delay parameter is set to zero (0.000 msec).
(The minimum delay time is the time required for A/D conversion, internal
transmission, and D/A conversion.)

•The digital input/output of the SRP-L300 are the non-synchronous, then they cannot be
used under synchronous facilities.
When using the SRP-L300 for video editing, use the analog input/output.

7-3-1. Change in parameter value of delay time

The delay time is a parameter with a high value range. Therefore, the change in two types
of values can be selected for the rotation click of the “ADJUST” knob during parameter
setting.

1 Coarse setting

In this setting method, the change value per one knob click automatically increases
when the parameter value of delay time increases.
The value is set at intervals of six samples (0.125 msec) even if the delay time is zero.
Moreover, the value can be changed at intervals of one frame when the delay time is
set to the unit display of a video frame.

2 Fine setting

In this setting method, the value is changed by the minimum resolution (0.0208 msec)
per click.

The setting method is switched as follows.

When the parameter edit screen of delay time is

Delay <SYNC
c 0.250[msec]

-

1

OVER/GR(dB)

36912151821242730

displayed, press the “ADJUST” button, then release it.

CH-1
CH-2

≥

¯

The coarse and fine settings are alternately switched,

Delay <SYNC
f 0.229[msec]

-

1

OVER/GR(dB)

36912151821242730

and the current state is displayed. Displays “c” and

CH-1

“f” on the screen are switched.

CH-2

29

7-3-2. Setting the display unit of delay time

The display unit for setting the delay time by edit operation can be specified from among
the following.

[msec] : Displays in units of time.
[samples] : Displays in units of sampling periods.

One sample is 1/48,000 seconds (about 0.0208 msec.).

[meter] : Displays in units of meters.

Displays the value calculated as sound velocity = 344 m/s.

[feet] : Displays in units of feet.

Displays the value calculated based on sound velocity = 1130 ft/s.

[NTSC] : Displays in units of NTSC video frame periods for video editing.

One frame is 1/30 seconds.

[P/S] : Displays in units of PAL/SECAM video frame periods for video

editing.
One frame is 1/25 seconds.

The display unit can be switched by the operation procedure below.

ADJUST

−+

≥

ADJUST

−+

≥

Delay UNIT
fine feet

-

Delay UNIT
fine meter

-

1

OVER/GR(dB)

36912151821242730

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

CH-1
CH-2

Press the ADJUST button when the parameter for
delay time is displayed.

≥

Turn the ADJUST knob clockwise or counterclockwise
while pressing the ADJUST button.

≥

The current unit is displayed by the first one click.
Turn the ADJUST knob again to change the display
unit.

≥

Release the ADJUST button when the desired display
unit appears.
The edit state is then returned. (Do not release without
turning the ADJUST knob with the ADJUST button
pressed. At that time, notice that the coarse and fine
settings are switched.)

30

8. PROGRAM STORE AND RECALL

The signal processing state at that time, that is, the setting state of algorithms and
parameters used is called a “program.”
In the SRP-L300, a maximum of 20 “programs” can be stored in internal nonvolatile
memory. After that, the “programs” can be recalled to reproduce the operation state in
which they were stored.
The “program” storage or recall operation is described below.

8-1. Selection of Program Operation

The four types of program operations below are available.

1 Recall : Recalls programs from memory (memory circuit).
2 Store : Memorizes programs in memory.
3 Delete : Deletes programs from memory.
4 Protect : Sets so that the programs in memory cannot be deleted or changed.

Select the program operation according to the procedure below.

PROGRAM

A Press several times.

PROGRAM

B Turn.

SELECT

−+

PUSH ENTER/YES

SELECT

−+

P01 DYNAMICS(A)

PROGRAM RECALL

-

1

OVER/GR(dB)

36912151821242730

Press the “PROGRAM” button once. The level meter
display then disappears, and the set enters the

CH-1
CH-2

program operation state.

Specify the type of program operation by procedure A or B below.

A. Press the “PROGRAM” button several times until

the desired operationname blinks.

P01 DYNAMICS(A)

PROGRAM RECALL

-

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

B. Turn the “SELECT” knob until the desired

operation name blinks.

P01 DYNAMICS(A)

PROGRAM STORE

-

P01 DYNAMICS(A)

PROGRAM DELETE

-

P01 DYNAMICS(A)

PROGRAM PROTECT

-

1

OVER/GR(dB)

36912151821242730

1

OVER/GR(dB)

36912151821242730

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

CH-1
CH-2

CH-1
CH-2

Press the “SELECT” button when the desired operation name blinks.
The blink display changes to the normal display, and the desired operation is selected.

PUSH ENTER/YES

After that, continue according to the procedure for each operation.

31

8-2. Using the recall program

The recall function is used to recall and execute the programs stored in memory as a
temporary program.

After the recall operation is selected, do the following procedure.

SELECT

−+

PUSH ENTER/YES

SELECT

−+

PUSH ENTER/YES

Recall execution

SELECT

−+

PUSH ENTER/YES

P01 DYNAMICS(A)

PROGRAM RECALL

-

P02 DAL-1000(A)
SURE? (RECALL)

-

1

OVER/GR(dB)

36912151821242730

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

CH-1
CH-2

Recall stop

EXIT/NO

P02 DAL-1000(A)
RECALL Complete!

-

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

The program number blinks when “PROGRAM
RECALL” is selected.

Turn the “SELECT” knob to select the program
number to be recalled.

Press the “SELECT” button to determine the program
when the program you wish to recall is displayed.
Message “SURE (RECALL)?” is then displayed in the
lower low.

To execute the selected recall, press the “SELECT”
button.
(To stop the recall operation, press the “EXIT” button
and return to the program number selection.)

After the recall operation is completed, the temporary
program is changed and message “RECALL
Complete!” is displayed for about 4 seconds. After
that, the default state is returned.

32

Note

The existing temporary program is deleted when the recall operation is executed.
When message “SURE (RECALL)?” is displayed, reconfirm whether to delete the program
and store it as required.

8-3. Using the Store Program

The store function is used to assign a name to the contents of a temporary program and
memorize it in the internal memory.

After the store operation is selected, do the following procedure.

SELECT

−+

PUSH ENTER/YES

SELECT

−+

PUSH ENTER/YES

SELECT

−+

PUSH ENTER/YES

P01 DYNAMICS(A)

U01 User01

-

P01 DYNAMICS(A)

U02 --------

-

P01 DYNAMICS(A)
U02 User-0ISC

-

1

36912151821242730

1

36912151821242730

1

36912151821242730

CH-1
CH-2

OVER/GR(dB)

CH-1
CH-2

OVER/GR(dB)

CH-1
CH-2

OVER/GR(dB)

The program number that can be stored blinks (in the
rower line) when “PROGRAM STORE” is selected.
The program that can be stored is a user program in
which no program protection has been set.

Turn the “SELECT” knob to display the number to be
stored.
The name displayed together with a number indicates
that a program has been already stored under the
number.
If the number you wish to store is displayed, press the
“SELECT” button.

After the number selection is completed, assign
a name to it.

Eight alphanumeric characters can be assigned as
the name.
The program name when a program is recalled is
displayed first. Change one character at a time
using two knobs.

1 Turn the “SELECT” knob clockwise or

counterclockwise.
>The cursor position moves.

2 Turn the “ADJUST” knob clockwise or

counterclockwise.
>The character in which the cursor is put is
changed.

3 Press the “ADJUST” button.

>The current characters are cleared. A

space (blank) then occurs.
After all characters are entered, press the “SELECT”
button.

SELECT

−+

PUSH ENTER/YES

Overwrite?
U02 User02

-

Overwrite stopOverwrite execution

EXIT/NO

U02 User02 (A)
STORE Complete!

-

If a program has been already stored with that
number, a message on whether to delete the previous

CH-1
CH-2

1 OVER/GR(dB)36912151821242730

program by overwrite is displayed.

To overwrite the previous program, press the
“SELECT” button.
(To stop the overwrite operation, press the “EXIT”
button. The program number selection state is then
returned.)

No confirm message is displayed if the overwrite
operation is not performed.

After the store operation is completed, message
“STORE Complete!” is displayed for about four

CH-1
CH-2

1 OVER/GR(dB)36912151821242730

seconds. The default state is then returned.
The program name and name displayed in the default

33

state is used as a newly stored number and name.

8-4. Using the Delete Program

The delete function is used to delete the unnecessarily stored program.

After the delete operation is selected, do the following procedure.

SELECT

−+

PUSH ENTER/YES

SELECT

−+

PUSH ENTER/YES

Delete execution

SELECT

−+

PUSH ENTER/YES

U01 User01 (A)

PROGRAM DELETE

-

1

OVER/GR(dB)

36912151821242730

U02 User02 (A)

PROGRAM DELETE

-

1

36912151821242730

OVER/GR(dB)

U02 User02 (A)
SURE? (DELETE)

-

Delete stop

EXIT/NO

1

36912151821242730

OVER/GR(dB)

The program number blinks when “PROGRAM
DELETE” is selected.

CH-1
CH-2

Turn the “SELECT” knob to display the program
number to be deleted.

CH-1
CH-2

The program that can be deleted is a user program in
which no program protection is set.

If the number you wish to delete blinks, press the
“SELECT” button.

The confirm message on whether to delete the
program is displayed.

CH-1
CH-2

To delete the program, press the “SELECT” button.
(To stop the delete operation, press the “EXIT” button.
The program number selection state is then returned.)

34

U02 User02 (A)
DELETE Complete!

-

1

36912151821242730

OVER/GR(dB)

After the delete operation is completed, message
“DELETE Complete!” is displayed for about 4

CH-1
CH-2

seconds. After that, the default state is returned.

Note

Even if the program with a temporary program number is deleted, only the information in
nonvolatile memory is erased. In this case, the signal processing is continued in the same
manner as before. The temporary program number at that time is lost and displayed as
“U – –.”

U-- User02 (A)
In =

-

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

8-5. Using the Protect Program

The protect function is used to protect the stored program from being deleted or
overwritten accidentally.

SELECT

−+

PUSH ENTER/YES

SELECT

−+

PUSH ENTER/YES

SELECT

−+

PUSH ENTER/YES

U01 User01 (A)

PROGRAM PROTECT

-

U02 User02 (A)

PROGRAM PROTECT

-

U02 User02 (A)

NOT PROTECTED

-

1

OVER/GR(dB)

36912151821242730

1

OVER/GR(dB)

36912151821242730

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

CH-1
CH-2

CH-1
CH-2

√

U02 User02 (A)

*PROTECTED

-

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

After the protect operation is selected, do the
following procedure.
The program number blinks when “PROGRAM
PROTECT” is selected.

Turn the “SELECT” knob to display the program
number and name for protect setting.

Turn the “SELECT” knob to switch the setting when
the program number for setting change is displayed.
“PROTECTED” and “NOT PROTECTED” (writable)
are alternately switched every time the “SELECT”
knob is clicked. When the former state is changed, a

“＊” mark is displayed on the beginning of the state

display.

Press the “SELECT” button to define the “＊” marked

state.
After the “SELECT” button is pressed, do not carry
out other operations before defining the
corresponding state. Otherwise, the change is
invalidated.

U02 User02 (A)
Set Complete!

-

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

After the definition is completed, the setting is stored
and the message “SET Complete!” is displayed for
about four seconds. The default state is then returned.

35

9. LOCK FUNCTIONS

The lock function is used to prevent the completed setting from being changed accidentally.

The two types of lock functions below are available.
A Simple lock : Any user can unlock in a simple unlock procedure.
B Code lock : Four-digit identification (ID) numbers are assigned for locking. Only

the user who recognizes the (ID) numbers can unlock it.

Note

During locking, the indicator of the LOCK button lights to indicate that the set is in the
lock state.

9-1. Lock Procedure

LOCK

A Press several times.

LOCK

B Turn.

SELECT

−+

PUSH ENTER/YES

√

SELECT

−+

PUSH ENTER/YES

Press the LOCK button.

Specify the type of lock in procedure A or B below.

Lock?
SimpleLock

-

1

36912151821242730

OVER/GR(dB)

A. Press the “LOCK” button several times.

CH-1
CH-2

¯

Lock?
Code Lock

-

1

36912151821242730

OVER/GR(dB)

B. Turn the “SELECT” knob.

CH-1
CH-2

Press the “SELECT” button when the type of specified
lock is displayed.

36

A. When a simple lock is selected

SELECT

−+

PUSH ENTER/YES

√

LOCK

Indicator lights.

B. When a code lock is selected

ADJUST

−+

SURE?(Lock)
SimpleLock

-

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

Lock stop

EXIT/NO

Locked! Locked!
SimpleLock

-

Enter Lock Code

- - - -

-

1

OVER/GR(dB)

36912151821242730

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

CH-1
CH-2

Enter numeric characters.

SELECT

−+

The confirm message on whether to lock is displayed.

Press the “SELECT” button. (To stop the lock
operation, press the “EXIT” button.)

The lock state is then entered.

Enter four-digit lock codes (identification (ID)
numbers).

Turn the “SELECT” knob to select the cursor position,
then turn the “ADJUST” knob to enter numeric
characters.

SELECT

−+

∫

PUSH ENTER/YES

Indicator lights

LOCK

PUSH ENTER/YES

Note

Enter all of the four numeric characters for lock operation.
Be careful not to forget the ID numbers. If so, you cannot
unlock it.

Press the “SELECT” button after four numeric
characters are entered.

Locked! Locked!
Code Lock

-

1

36912151821242730

OVER/GR(dB)

The lock state is then entered.

CH-1
CH-2

Note

During lock, the indicator of the LOCK button lights to indicate that the set is in the lock state.
Operations other than described below cannot be accepted.

• Unlock operation

• Operation that selects the type of a level meter (Turn the “SELECT” knob.)

The lock in progress is displayed on the screen for about two seconds when any button is
pressed.

37

9-2. Unlock Procedure

LOCK

Press the “LOCK” button.

The next operation varies depending on the lock state.

A. When the lock state is a simple lock

SURE?(Unlock)
SimpleLock

-

Unlock

SELECT

−+

PUSH ENTER/YES

Unlock stop

EXIT/NO

SURE?(Unlock)
SimpleLock

-

Unlock

SELECT

−+

Unlock stop

EXIT/NO

1

36912151821242730

1

36912151821242730

CH-1
CH-2

OVER/GR(dB)

CH-1
CH-2

OVER/GR(dB)

The message on whether to unlock is displayed.

Press the “SELECT” button to unlock.
To stop the unlock operation, press the “EXIT” button.

The confirm message on whether to unlock is
displayed again.

Press the “SELECT” button to unlock.
To stop the unlock operation, press the “EXIT” button.

PUSH ENTER/YES

After the unlock operation is completed, the lock
indicator goes off.

38

B. When the lock state is a code lock

ID entered after press

SELECT

−+

PUSH ENTER/YES

Enter Lock Code

- - - -

-

1

OVER/GR(dB)

36912151821242730

CH-1
CH-2

Enter four-digit lock codes (identification (ID)
numbers) in the same procedure as during lock.

Enter the same numbers as the lock codes entered
during lock for unlock.

Press the “SELECT” button after four numeric
characters are entered.
If the lock codes are the same, the lock is released. The
default display then appears, and the LOCK indicator
goes off.

If the lock codes are incorrect, the lock state is
entered again.

Note

If you have forgotten lock codes and cannot release
the lock, unlock forcibly in the procedure below.

1) Turn off the power.

2) Push the “POWER” switch with the “LOCK” and

“EXIT” buttons pressed and turn on the power.

3) Release the “LOCK” and “EXIT” buttons.

At that time, the set can be activated with the lock
released.

During this operation, be sure to press the proper
button. If not, the message “the contents of internal
memory are erased”, or “the set cannot be activated
normally” appears.
Be sure to carry out the operation correctly.

39

10. DIGITAL INPUT AND OUTPUT

10-1. Digital Input

Digital input To signal processing block

The digital signal input to the SRP-L300 is converted into a sampling frequency of 48 kHz
using a sampling rate converter.
For the sampling frequency of the input signal, 32 kHz, 44.1 kHz, or 48 kHz can be
received.

If the digital input signal is properly received and valid, the “PLL” indicator lights.
When this indicator does not light, no data is received properly.
The possible cause is as follows:

The emphasized signal is automatically deemphasized when it is input.

10-2. Digital Output

The SRP-L300 always operates in a sampling frequency of 48 kHz in asynchronization
with a digital input signal. Therefore, a digital output signal is also asynchronized with
the digital input signal and fixed to a sampling frequency of 48 kHz at all times.

Decoder Deemphasis filter

• A cable is not connected to the digital input terminal.

• The equipment on the send side transmits no data.

• The transmission state is bad. (Noise mixing)

• The validity flag in input data is set to 1.

Sampling rate
converter

The channel status is always output as described below.

Mode :Professional
Audio mode :Audio mode fixing
Emphasis :No emphasis
Sampling frequency :Lock state, fixed to 48 kHz.

All user bits are output in a zero (“0”) level.

Note

• The channel status and user bit contained in the digital signal input into the SRP-L300
are not sent to an output signal.

• The digital input/output of the SRP-L300 are the non-synchronous, then they cannot be
used under synchronous facilities.

40

11. MAIN SPECIFICATIONS

Input/output interface

Analog input Terminal : XLR-3-31 type × 2

Circuit : Electronic balanced circuit

(1: GND, 2: HOT, 3: COLD)

Input impedance : 33 kΩ

Reference input level : +4 dBu
Maximum input level : +24 dBu
A/D conversion sampling frequency : 48 kHz
A/D resolution : 20 bits

Analog output Terminal : XLR-3-32 type × 2

Circuit : Electronic balanced circuit

(1: GND, 2: HOT, 3: COLD)

Load impedance : 600 Ω or more

Reference input level : +4 dBu
Maximum input level : +24 dBu
D/A conversion sampling frequency : 48 kHz
D/A resolution : 20 bits

Analog stacking Terminal : XLR-3-32 type × 2

Circuit : Connected directly with the analog input terminals.

(1: GND, 2: HOT, 3: COLD)

Digital input Terminal : XLR-3-31 type × 1

Format : AES/EBU format
Sampling frequency : 32 kHz, 44.1 kHz, 48 kHz
Allowance of bit length : 20 bits

Digital output Terminal : XLR-3-32 type × 1

Format : AES/EBU format
Sampling frequency : 48 kHz
Allowance of bit length : 20 bits

Digital through Terminal : XLR-3-32 type × 1

Circuit : Outputs a digital input signal through a buffer.

Audio characteristics (when analog input/output

signals are used)

Frequency response : 20 to 20,000 Hz +0/–1 dB
T.H.D : 0.01% or less

(Output level +14 dBu)

Dynamic range : 105 dB or more

(Input short, IHF-A)
Minimum signal delay time : 1.416 msec
0 dBu = 0.775 V

RS-232C remote terminal

Shape : D-sub, 9-pin (male)
Cable : Null modem

General

Power requirements : Refer to the “WARNING”
Power consumption : 24 W
Dimensions : Refer to the “External

Mass : Approx 4.7 kg (10 lb 6 oz)
Operating temperature : 0 ˚C to 40 ˚C
Storage temperature : –20 ˚C to 60 ˚C
Supplied accessories : Operating Instructions (1)

Dimensions” in Section 12.

Design and specifications are subject to change without notice.

41

12. EXTERNAL DIMENSION

STCKING

CH-2 CH-1

DIGITAL I/O ANALOG OUTPUT ANALOG INPUT

CH-2 CH-2CH-1 CH-1

THRU IN OUT

PUSH PUSH PUSH

REMOTE(RS-232C)

R

35016

370

POWER

ON OFF

INPUT LEVEL

CH-1 CH-2

0

−12 +12

dB

430
482

ADJUST

OUTPUT LEVEL

CH-1 CH-2

OVER

0

0

−12 +12

−12 +12

dB

dB

−12 +12

INPUT

ANALOG

0

DIGITAL

-

PLL

dB

LIMITER / DELAY

CH-1
CH-2

1

OVER/GR(dB)

36912151821242730

−+

−+

PUSH ENTER/YES

SELECT

EDIT PROGRAM

SYNC EXIT/NO

DIGITAL LIMITER/DELAY SRP-L300

LOCK

BYPASS

44

44

Unit: mm

42

PRESET PROGRAM

Preset Program Description and Parameter

SettingOutline

Twelve preset programs (P01 to P12) have been installed in advance in the SRP-L300.
P01 to P03 are a default program of each algorithm.

They are used when a program is newly created. P01 to P03 set no effect
independently.

P04 to P12 are an example of program settings. During recall, an effect is set in P04 to
P12. In this case, they can be used directly. In the (A) dynamics algorithm processing,
however, the parameter setting is closely related to an input signal (level). Therefore,
the desired effect may not be obtained during setting in the recall state. At that time,
adjust the parameter according to the actual operation state. Refer to the description of
each program below.

Even if you use no preset programs, read this manual as the reference for program
creation.

Preset List

Number

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

P11

P12

Name

DYNAMICS

DAL-1000

Tap Delay

NTSC 1fr

P/S 1fr

Cmp&Gate

PA Limit

Limiter

De-Esser

DAL A70%

Echo

Vo Reverb

algorithm

(A)

(B)

(C)

(A)

(A)

(A)

(A)

(A)

(A)

(B)

(C)

(C)

Description

(A) DYNAMICS algorithm default program

(B) DAL-1000 algorithm default program

(C) Tap Delay algorithm default program

Audio 1 frame delay during video editing (NTSC)

Audio 1 frame delay during video editing (PAL/SECOM)

Setting example of level equalization control. Gain make 10 dB

Setting example of PA limiter

Setting example of limiter

Setting example of de-esser

Operation example of DAL-1000 algorithm

Repeat echo example in which Tap Delay algorithm is used

Reverb setting example in which Tap Delay algorithm is used

43

DYNAMICS (A)

P01

DAL-1000 (B)

P02

P03

Tap Delay (C)

P04 NTSC 1fr (A)

P01 to P03 are the default program of each algorithm. They set no effect independently.
P01 to P03 are recalled to initiate the parameter setting when each algorithm program is
newly created.

P04 is a delay program corresponding to the one-frame time of a video signal (NTSC
format).
The delay value of an output signal is set to 1 frame time = about 33.354 [msec] when
analog input/output signals are used.
The parameter value of delay is a value from which the minimum delay time 1.416 msec
(= 68 [samples]) used for analog input/output signals is subtracted. The actual delay time
is about one frame time (= 33.354 [msec]).

Since the delay in a (A) DYNAMICS algorithm is used, the level control setting such as
preset programs P06 to P09 can also be combined using a compressor and expander in the
former stage by changing parameters.

Parameter used as setting point

(Block)

Main block

(Parameter name)

Delay

(Paramter setting)

31.937 [msec] (= 1533 [samples])

P05 P/S 1fr (A)

P05 is a delay program corresponding to the one-frame time of a video signal (PAL/
SECAM format). The delay value of an output signal is set to 1 frame time = 1/25 Seconds
(=40,000 [msec]) when analog input/output signals are used.
The parameter value of delay is a value from which the minimum delay time 1.416 msec
(= 68 [samples]) used for analog input/output signals is subtracted. The actual delay time
is 1/25 seconds (= 40.000 [msec]).

Since the delay in a (A) DYNAMICS algorithm is used, the level control setting such as
preset programs P06 to P09 can also be combined using a compressor and expander in the
former stage by changing parameters.

Parameter used as setting point

(Block)

Main block

Note

When using the SRP-L300 for video editing, use the analog input/output.
The SRP-L300 cannot be used under synchronous facilities of digital input/output.

(Parameter name)

Delay

(Paramter setting)

38.583 [msec] (= 1852 [samples])

44

P06 Cmp&Gate (A)

P06 is a control example in which the level is equalized using a (A) DYNAMICS algorithm.

• Compressor
The compressor raises a low-level signal, suppresses a high-level signal, equalizes the
level of an input signal, then outputs it (Fig. 1 on page 47).
A unity gain is almost obtained when the input level is –20 [dBFS]. (–20 [dBFS]
corresponds to +4 dBs (reference input level) with the INPUT LEVEL knobs set to 0
[dB].)
The level is lowered by approximately 13 [dB] (maximum) for an input signal higher
than –20 [dBFS]. A gain of 10 [dB] (maximum) is gained for an input signal lower than
–20 [dBFS].

The attack (compressor attack) and release (compressor release) are set to the longer
time so that a fine change in sound volume does not occur and so that a natural level
control occurs.
The operation trigger (main block/compressor trigger) is set to LINK (MIX) and all
parameters are synchronized. Therefore, the balance (image-assigned position) on the
right and left is maintained for a stereo signal. If no link is required, the balance is
changed to “SEPARATE” during use.
Moreover, the level for a unity gain can be adjusted when the compressor threshold
level is changed according to the input level or desired output level (Dotted line in Fig.
1 on page 47).

• Expander/gate
The expander/gate is set as a noise gate that cuts noises at the time of silence.
Adjust the threshold (expander threshold) level according to the noise level of an input
signal. (The noise in an internal A/D converter is reduced in that state when an analog
input signal is used.)
The same signal as for a compressor is input to the expander/gate. The expander and
gate perform the processing (calculation of gain reduction) independently and in
parallel. Therefore, the threshold level is also simply set according to the noise level of
an input signal irrespective of the compressor setting. (Refer to the block diagram on
page 16 of the Instruction Manual.)

Parameters used as setting point

(Block)

Main block

(Refer to the description on page 51)

(Parameter name)

Compressor

Expander

Dynamics Level

Trigger

On/Off

Attack

Release

Threshold

Ratio

Trigger

On/Off

Attack

Hold

Release

Threshold

Ratio

Maximum GR

(Parameter setting)

LINK (MIX)

On (SYNC)

33 [msec] (SYNC)

3300 [msec] (SYNC)

–35 [dB] (SYNC)

3.0 [:1] (SYNC)

LINK(MIX)

On (SYNC)

22 [msec] (SYNC)

200 [msec] (SYNC)

200 [msec] (SYNC)

–90 [dB] (SYNC)

2.5 [1:] (SYNC)

–60 [dB] (SYNC)

10.0 [dB] (SYNC)

45

P07 PA Limit (A)

P07 is a setting example of a limiter for PA application using a DYNAMICS algorithm
(Figs. 2 on page 47).

• Compressor
The compressor reduces the gain so as to protect an amplifier or speaker when the
threshold level is more than –20 [dBFS]. (–20 [dBFS] corresponds to +4 dBu (reference
input level) with the INPUT LEVEL knobs set to 0 [dB].) The gain reduction exceeding
the threshold level is 12 [dB] (maximum).
Since the soft knee level is set to 5 [dB], the gain reduction is gradually initiated when
–25 [dBFS] is exceeded.

The threshold (compressor threshold) level and ratio (compressor ratio) are changed
for use according to the desired output level.

P07 is set so that CH-1 and CH-2 are linked. To operate P07 independently, change the
trigger (compressor trigger) to “SEPARATE.”

• Expander/gate
The expander/gate is set as the same noise gate as for P06.
If the noise gate is not used, change the expander On/Off parameter to “OFF” or
change the ratio (expander ratio) to the set value lower than 2.5. If the ratio is set to 1.0
(minimum), the operation is the same in meaning as the expander off operation.

Parameters used as setting point

(Block)

Main block Trigger

(Parameter name)

Compressor

On/Off

Attack

Release

Threshold

Ratio

Soft Knee Level

Expander

Trigger

On/Off

Attack

Hold

Release

Threshold

Ratio

Maximum GR

(Parameter setting)

LINK (MIX)

On (SYNC)

AUTO (SYNC)

AUTO (SYNC)

–20 [dB] (SYNC)

2.5 [:1] (SYNC)

5 [dB] (SYNC)

LINK (MIX)

On (SYNC)

22 [msec] (SYNC)

200 [msec] (SYNC)

200 [msec] (SYNC)

–90 [dB] (SYNC)

2.5 [1:] (SYNC)

–60 [dB] (SYNC)

46

–100 –80 –60 –40

–35

–20

0

–20

–40

–60

–80

–100

Fig. 1
Relation between Input/
Output Levels in P06
(Compressor and Gate)

(The dotted line indicates
the case where the
“Compressor Threshold”
was changed.)

–100 –80 –60 –40 –20

0

–20

–40

–60

–80

–100

Fig. 2
Relation between Input/
Output Levels in P07 (PA
Limiter)

(The dotted line indicates
the case where the
“Compressor Threshold”
was changed.)

47

P08 Limiter (A)

P08 is a program in which the compressor is used as a peak limiter.
A distortion-free peak limiter is obtained when this compressor is used instead of the
limiter in the later stage of an algorithm. Set the threshold (compressor threshold) level
according to the level you wish to limit.

The compressor attack is set to 0.1 [msec] (maximum) so as to trace the peak value of
waveforms.
The soft knee level is maximized to reduce the unnaturalness that is caused by a sudden
change in gain reduction near the threshold level.

The compressor ratio is set to ∞:1. However, the peak value of actual output waveforms

instantaneously goes higher than the set threshold level by 2 or 3 [dB] when a sudden
change in level occurs. To completely suppress the peak value, set the threshold level
lower than the limit level by 2 to 3 [dB].

In addition to this setting, the peak value can be set using a side equalizer so that it reacts
on specific frequencies or not.

Parameter uses as setting point

(Block)

Main block

(Parameter name)

Compressor Trigger

On/Off

Attack

Release

Threshold

Ratio

Soft Knee Level

(Parameter setting)

LINK (MIX)

On (SYNC)

0.1 [msec] (SYNC)

AUTO (SYNC)

–20 [dB] (SYNC)

∞ [:1] (SYNC)

18 [dB] (SYNC)

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P09 De-Esser (A)

P09 is a dossier program in which a DYNAMICS algorithm is used. It is an example in
which the frequency sensitivity was set using the side equalizer of a compressor.

A side equalizer is set in the bandpass filter, and the fricative sound of a human voice is
extracted and used as a trigger signal for compressor operation. As a result, the gain
reduction is set to reduce an unnecessary fricative sound only when the fricative sound*
exceeding the set level is contained.

* Fricative sound Consonant components of a sound (sa, shi, su, se, so, chi, or tus)

contained in the human voice. The fricative sound may be heard
as distortion.

Adjust the threshold (compressor threshold) level according to the input level while
monitoring a gain reduction meter (DGR). (Only specific frequency components are
extracted using a bandpass filter. Therefore, notice that the trigger signal level is lower
than the former input level).
A high effect is obtained when the threshold level is set so that compression is slightly
placed even in the portion free of a fricative sound. At that time, adjust the gain make
level (dynamics level) in the later stage so as to set a unity gain in the input/output signal.

The side equalizer is set in a bandpass filter with a center frequency of 5 kHz. The
frequency of the sound to be reduced changes when this center frequency is changed.
It is recommended to change the frequency according to the voice quality.

Parameters used as setting point

(Block)

Main block

(Parameter name)

Compressor

Dynamics Level

Trigger

On/Off

Attack

Release

Side EQ Type

Threshold

Ratio

Soft Knee Level

Freq

(Parameter setting)

LINK (MIX)

On (SYNC)

0.1 [msec] (SYNC)

130 [msec] (SYNC)

BPF (SYNC)

5.00k [Hz] (SYNC)

–35 [dB] (SYNC)

10 [:1] (SYNC)

18 [dB] (SYNC)

4.0 [dB] (SYNC)

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P10 DAL A50% (B)

P10 is a program in which a DAL-1000 algorithm is used by type A with a ratio of 50%.
The variable parameter of a DAL-1000 algorithm is only a type (DAL type) and ratio (DAL
ratio effect value).

Therefore, this algorithm requires no complicated adjustment and can obtain a constant
gain. In this program, the ratio (DAL ratio) is set to 50%, and the output signal level is
more increased in gain than an input signal by 3.5 [dB].
For an increase of 3.5 [dB] in gain, signal waveforms are digitally hard-clipped when they
are set to more than –3.5 [dBFS]. An unpleasant noise is generated in this case. In the
DAL-1000 algorithm, however, the waveforms are soft-clipped, so the acoustic distortion
is suppressed to the minimum.

The delay at the end of an algorithm can also be combined for use. No time lag is
generated by soft clipping.
There is another way to use this algorithm. If the gain (3.5 dB for this program) obtained
by ratio (DAL ratio) setting is lowered by the level parameter in a main block, the basic
output level is used as a limiter that soft-clips the waveforms when the maximum value of
waveforms is less than –3.5 [dBFS].

Parameters used as setting point

(Block)

Main block

(Parameter name)

DAL Type

DAL Ratio

(Parameter setting)

Type A

50 [%] (SYNC)

P11 Echo (C)

P12 VoReverb (C)

P11 is an example in which a repeat type echo was created using a Tap Delay algorithm.
The delay time in CH-1 and CH-2 is changed to obtain the stereo sense of a delay sound.
Change the delay level and adjust the volume of the whole delay sound.

Parameters used as setting point

(Block)

Main block

The parameter values of each tap are omitted.

P12 is a setting example in which a reverb sound is added using a Tap Delay algorithm.
Especially, it is recommended to use P12 for vocal.
Change the delay level and adjust the volume of the whole delay sound.

Parameters used as setting point

(Block)

Main block

(Parameter name)

Delay Level

Direct Level

(Parameter name)

Pra Delay

Delay Level

Direct Level

(Parameter setting)

–6.0 [dB]

0.0 [dB]

(Parameter setting)

0.000 [msec] (SYNC)

–6.0 [dB]

0.0 [dB]

50

The parameter values of each tap are omitted.

Complementary explanation on (A)DYNAMICS algorithm — Setting the input/output level of compressor

During compressor operation, the three parameters below determine the basic relation of
the input/output level.

Compressor Threshold in main block (Sets the threshold level.)
Compressor Ratio in main block (Sets the ratio.)

Dynamic Level in main block (Sets the gain make.)
The level control can be set according to the situation by changing the three parameters.
To understand these parameters, represent the relation of the input/output level using a
graph as shown in Figs. 1 and 2 on page 47. The parameter value can be easily grasped in
this case.

Reference

As described above, the relation of the input/output level determined by three parameters
(threshold, ratio, and gain make) is almost accurate for a constant-level input signal such as a 1 kHz
sine wave. However, the relation of the actual input/output level may not be slightly accurate for a
music signal.

• Effect of signal on fine peak values

The level meter of the SRP-L300 is a peak meter for both input/output signals and gain
reduction. The level meter display is higher in value than the effective value or VU display.
Especially, do not monitor only the output level meter during compressor operation. The peak
value of rising waveforms before compression starts is displayed in the output peak level meter,
and the output level seems higher in whole. Therefore, monitor the gain reduction meter together
with the output level meter.

• Effect of attack and release

The setting of attack and release that are a time-base parameter slightly influences the gain
reduction level.
As the attack is set to the longer time, the rising of a signal is no longer traced in the level
detection block. As a result, the input level is estimated to be low on the average. As the release is
set to shorter time, the reaction on the falling of a signal becomes more quick. The input level in
this case is also estimated to be low. In other words, the response in the level detection circuit
comes near the peak level of an input signal as the attack becomes shorter and as the release
becomes longer. Conversely, the response becomes lower than the peak level as the attack
becomes longer and as the release becomes shorter.
To set the attack and release, adjust parameters such as a threshold level while monitoring the
level meter in consideration of the above description.

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