Junger Audio d06 User Manual

2ch digital audio leveller

d06

LEVEL MAGIC™

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pag

FOREWORD

Thank you for buying and using the 2-channel Digital Audio Level Processor
d06.

You have acquired the latest generation of digital dynamic range processing
and also a piece of equipment which is unique in its design and
specification.

Please read this manual carefully to ensure you have all the information you
need to use the 2 - channel Digital Audio Level Processor d06.

The unit was manufactured to the highest industrial standards and went
through extensive quality control checks before it was supplied.

1

If you have any comments or questions about installing, setting-up or using
the d06, please do not hesitate to contact us.

Operation manual do6, chapter 1 – Content

e 1 of 4

CONTENT

2. Function description

2.1 Basic description

2.2 Block diagram

2.3 Audio signal processing

2.3.1 Gain

2.3.2 Audio Leveler Level Magic™

2.3.3 Limiter

2.4 The Jünger Audio Dynamics Principle

2.4.1 Program

2.4.2 Influence of signal delay time

3. Installation

3.1 Unpack the unit

3.2 Power supply

3.3 Connections

3.4 Rack mounting

3.5 Operation safety

3.6 Synchronization the digital output

3.7 Rear panel connectors

3.7.1 Audio connections

3.7.2 GPI

3.7.3 GPO (tally)

3.7.4 Serial RS422 or RS232 or CAN

3.7.5 LAN ( Ethernet)

3.8 Switches and jumpers for configuration

3.8.1 Selection of the serial remote interface

3.8.2 Calibration of the analog inputs and outputs

Operation manual do6, chapter 1 – Content – page 2 of 4

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4. Network integration

5. Operation

5.1 GUI operation

5.1.1 Setting the d06 parameters

5.1.2 Setup the device

5.1.3 General settings

5.1.4 Preset operation

5.1.5 GPI/O set up

5.1.6 LAN Controller set up

5.1.6.1 System Configuration

5.1.6.2 Backup 6 restore

5.1.6.3 Software update

5.1.6.4 Reboot the LAN Controller

5.2. Front Panel Operation (optional)

5.2.1 Setting the reference levels

5.2.2. Menu selection

5.2.3. Preset menu

5.2.4. Configuration menu

5.3.5. Parameter menu

6. Technical specifications

7. Warranty and service information

8. CE Declaration of Conformity

Operation manual do6, chapter 1 – Content

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Operation manual do6, chapter 1 – Content – page 4 of 4

2. FUNCTIONAL DESCRIPION

FUNCTIONAL DESCRIPTION

The digital dynamics processor d06 is a professional studio device that is
performing automated levelling of digital audio signals.

The dynamic range processor principles developed by Jünger Audio enable
level managing devices like compressors, AGC and limiters to be produced
with exceptionally high audio quality, without coloration, pumping, breathing,
distortion or modulation effects sometimes associated with this type of
processor.
In short, almost inaudible processing - with ease of use. The outstanding
quality of the processing is based on the Multi-Loop dynamic range control
principle in combination with adaptive controlled processing algorithms
developed by Jünger Audio.

The unit is easy to operate and requires only a limited number of settings to
be made by the user to achieve optimum results. All other parameters
necessary for inaudible processing are continuously automatically controlled
in response to changes in the programme signal.

features

• 2-channel digital audio levelling processor

• various link modes: stereo 1/2 or ch1 and ch2 independent

• adjustable input gain (channel independent) -20...+20 dB

• adaptive controlled audio levelling processing

- Leveler, Transient Processor, Limiter

• user friendly preset and recall function (10 presets)

• extern sync mode, AES/EBU, WCLK or VIDEO

• RS-232/422 interface for serial remote

• GPI interface for parallel remote control, tally output

• operation via web interface (LAN)

• optional operation via front panel

2

2.1

BASIC
DESCRIPTION

operation manual d06, chapter 2 - Functional Description - page 1 of 8

2. FUNCTIONAL DESCRIPTION

2.2

BLOCK
DIAGRAM

operation manual d06, chapter 2 - Functional Description - page 2 of 8

2. FUNCTIONAL DESCRIPION

All signal processing is done in the digital domain by Texas Instruments
floating point signal processors. The use of 32 bit word length for calculation
ensures that there is no deterioration in signal quality, even if an audio signal
with a maximum word length of 24 bit is input into the processing of the unit.

GAIN means linear amplification of input signals. The input gain can be
changed in steps of 0.1 dB , within a range from -20...+20 dB for both
channels.

Level Magic ™ is a unique algorithm to make automated audio levelling
possible.

Input level change

Pic. 2 is showing a
theoretical level change of
+5dB and –5dB around
program level.

Working with AGC

In pic.3 a conventional
AGC is used to adjust the
level. As we can see the
AGC needs a certain time
to react, that is necessary
for mostly inaudible gain
correction. But that’s too
long to get a proper
correction of the input level
change.

Level Magic ™

Level Magic ™ is a unique
combination of a transient
processor and an adaptive
AGC process. The
transient processor can fill
the lack of level control
against the slow acting
AGC. The total gain of
Level Magic ™ is the
addition of the gain by the
transient processor and the
gain of the AGC.

Transient

Processor

AGC

adaptive

AGC

2.3

AUDIO SIGNAL
PROCESSING

2.3.1

GAIN

2.3.2

AUDIO LEVELLER
LEVEL MAGIC™

operation manual d06, chapter 2 - Functional Description - page 3 of 8

Adjustment
procedure

Process
description

2. FUNCTIONAL DESCRIPTION

The Level Magic ™ process needs to be setup in three steps

- select one of the default presets for your apllication
(see preset description in chapter 5)

- adjust the operation level and peak level referring to standards that
are used for your application

- if the default preset is not giving satisfying results change the
parameters indivdually

Level Magic ™ is using a unique combination of QP and RMS level detectors
to analyze the incoming audio signal. By comparing QP and RMS
measurement results we can find out how much transients are coming in.
Dependent on that the necessary resulting gain is controlled in relation
between transient processor and AGC.

Limiter

Transient

Processor

Level

Detection

AGC

Parameter
description

Transient processor is doing fast gain change and the AGC is doing slow gain
change (depending on settings). The way how Level Magic is acting on the
audio is mostly determined by balancing between slow and fast gain changing
process. The AGC should be set in a way that the gain change is mostly
inaudible (1dB per 5 seconds or slower). The Transient Processor should be
set that incoming level jumps are reduced but originally dynamic range is not
changed too much. As more possible gain by the Transient processor
(RANGE), as more reduction of the dynamic range will be.
SOFT level control: AGC range …15dB, time >=2min
Transient range …4dB, soft process
MID level control: AGC range …12dB, time >=1min
Transient range …6-8dB, mid process
HARD level control: AGC range …10dB, time >=40sec
Transient range …10dB, hard process

Parameter description:
AGC

OP-level operation level, target level for the AGC and for

the Transient Processor
Range max. gain by the AGC
Time time to reach the max. gain change
Gate threshold level where the AGC stops gain

change and moves gain slowly to the long

term average gain

Transient Processor

Process a combination of level ratio and release

characteristic for the fast gain change (soft, mid,

hard)

Range max. level change by the Transient Processor

operation manual d06, chapter 2 - Functional Description - page 4 of 8

2. FUNCTIONAL DESCRIPION

The static characteristics of the d06 limiter usually refers to a digital output
level of 0 dBFS (dB Full Scale). This is useful for most applications of the
dynamics processor as the on-following digital recording system is supposed
to be balanced down to the final bit.
For applications using headroom the output level can be adjusted within 0 ... -
20 dBFS in steps of 0.1 dB. The limiter threshold determines the maximum
output level.
The static characteristic for the limiter at a limiter threshold of -12dBFS is
illustrated in fig. 6.

limiter
threshold

0...-20dBFS

input

-40

-60

-50

max. output
level

-30

-20

-10

[dBFS]

-10

-20

-30

2.3.3

LIMITER

fig. 6:

basic function:
limiter

-40

-50

output

For the dynamics functions a signal delay of approx. 2 ms is built in. This
delay makes it possible to arrange the algorithm of the limiter in such a way
that the control mechanism is activated before maximum level is reached (look
ahead limiter). Within the rise time of the signal the peak level is recognised
and the maximum is calculated in such a way that limiter threshold level is
reached precisely without causing clipping.

A change in the dynamic range of an audio signal is a non-linear process. The
gain of a dynamic range processor is not constant as it is with the gain of a
linear amplifier. The gain varies in time depending on the input signal and
depending on the specific control algorithm of the dynamics processor. These
variations in the gain, which represent the real control process, should take
place without any bothersome side effects.
The dynamic range processor principle developed by Jünger Audio makes it
possible to realize dynamics processors (compressor, limiter, expander) with
very high audio quality, without signal discoloration, pumping or breathing,
without distortion and modulation products - in short, with almost inaudible
processing - and they are very easy to use.

2.4

THE JUNGER
AUDIO DYNAMICS
PROCESSOR
PRINCIPLE

operation manual d06, chapter 2 - Functional Description - page 5 of 8

2. FUNCTIONAL DESCRIPTION

The Junger Audio dynamics processors work according to a Multi-loop
principle, operating with an interaction between several frequency linear
control circuits. This is quite different to the popular multiband structure which
changes the sound.

A A

Multi - Band

f

delay

1

Multi - Loop

1
2

2

n

m

f

2.4.1

PROGRAM

The resulting attack and release times of the Multi-loop system are variable
and adapted to the evolution of the input signal. This allows relatively long
attack times during steady-state signal conditions but also very short attack
times when there are impulsive input transients.
The Multi-loop structure also permits a short time delay between the control
circuit and the gain changing element. The gain control circuit has time to
preview the signal and become active before it reaches the output. This is
particularly important for the limiter, which provides a precisely leveled output
signal absolutely free of overshoots (clipping).

For some of the control parameter it is possible to define a limited range of
time constant values which are allowed for the adaptive dynamic range
algorithms. Inside this range the time constants can be varied by the adaptive
processing. Setting the range of time constant values may be sometimes
useful, to get the best signal processing performance regarding specific
programme material.

Parameter related to the transient response of the control circuit are important
for distortionfree processing. These time constants are allways adaptive
controlled without remarkable limitation of parameter range. This is caused by
the presence of transient pulses in allmost each kind of programme material.
The algorithm has to guarantee best reaction for fast increasing level of
transient signals anytime even if classical music with slow dying out
characteristic is processed. In all cases the attack time of the limiter for very
short transients is zero.

operation manual d06, chapter 2 - Functional Description - page 6 of 8

2. FUNCTIONAL DESCRIPION

Especially the release time of the control circuit has more influence to the
increase of loudness as any other parameter. The ranging of time constants in
processing time groups reflects this fact. The range for processing time shows
influence on release time parameter mostly.
The selection of the parameter limiter PROCESS changes the range of time
constant values as follows:

PRO processing time

--------------------------------------------------------­ 0 2 ms to 0.2 sec
1 5 ms to 0.5 sec
2 10 ms to 0.8 sec
3 15 ms to 1.2 sec
4 30 ms to 2.5 sec
5 50 ms to 3.5 sec
6 70 ms to 5.0 sec
7 100 ms to 6.0 sec
8 150 ms to 8.0 sec
9 250 ms to 10.0 sec

The audio signal delay through the dynamics processor is approx. 2ms due
to delaying of the audio signal using internal memory. A small delay is
deliberately introduced to the audio signal in order to allow limiter and
compressor algorithms which can 'preview' the audio signal before
changing it. That is the signal curve can be changed before maximum level is
reached. This delay must be considered before attempting to mix signals
processed by the dynamics processor with other undelayed signals.
When mixing together a delayed signal and a direct signal there may be
cancellation of the signal waveform at some frequencies and re-inforcement
of the waveform at other frequencies (comb filter effect). Corresponding
2ms delay of direct signals should therefore be carried out before mixing
them with delayed processed signals.

2.4.2

INFLUENCE OF
SIGNAL DELAY
TIME

operation manual d06, chapter 2 - Functional Description - page 7 of 8

2. FUNCTIONAL DESCRIPTION

operation manual d06, chapter 2 - Functional Description - page 8 of 8

3. INSTALLATION

INSTALLATION

The digital audio level processor d06 was packed carefully in the factory and
the packaging is designed to protect the equipment from rough handling.
Please examine carefully the packaging and its contents for any signs of
physical damage, which may have occured in transit.

The digital audio level processor d06 is a device under the safety category

Schutzklasse 1 in keeping with the VDE 0804 standards and may only used

with power supply installations built according to regulations.
Check the voltage details printed at the rear panel are the same as your local
mains electricity supply.

The digital audio level processor d06 is equipped with standard connectors
(see also chapter 3).
Before connecting the digital audio level processor d06 switch the power off at
all connected units.

The digital audio level processor d06 is made as standard 19“ unit (EIA
format). It occupies 1 RU (44 mm height) space in a rack. Please allow at
least additional 3inch of space for the connectors on the rear panel.
When installing the unit in a 19“ rack the rear side of the unit needs some
support, especially for mounting in flight cases.

The digital audio level processor d06 should not be installed near units which
produce strong magnetic fields or extreme heat. Do not install the audio
processor directly above or below power amplifiers.
If, during operation, the sound is interrupted or displays no longer illuminate,
or if abnormal odor or smoke is detected immediately disconnect the power
cord plug and contact your dealer or Junger Audio.

3

3.1

UNPACK THE
UNIT

3.2

POWER SUPPLY

3.3

CONNECTIONS

3.4

RACK MOUNTING

3.5

OPERATION
SAFETY

operation manual d06, chapter 3 - Installation - page 1 of 10

3.6

SYNCHRONIZING
THE DIGITAL
OUTPUT

3.7

REAR PANEL
CONNECTORS

LAN-controller
web interface

3. INSTALLATION

The digital audio level processor d06 has a digital signal output. For the
problem-free combination of following digital devices, the digital signal
processing can be locked to an external clock reference. The selection of the
corresponding sync source is made in the SYNC MODE menu during setup. If
the chosen sync input is connected with the sync signal, this signal is used for
synchronization automatically. All sync sources can be used for locking A/D­converters at the analogue inputs as well. The digital output signal can be
clocked with the following clock frequencies:

INTERNAL locks both the A/D-converters and the digital output with

the internal reference 44,1 or 48 kHz. Digital inputs are
connected via sample rate converter

AES INPUT locks with the clock frequency of the input signal at
EXT AES locks with the AES signal at the sync input

EXT WCLK locks with the word clock signal at the sync input

EXT VIDEO locks with black burst at sync input (internal 48 kHz) Digital

Important Note! Video Sync is an option for the d06. For the very rare case

that you can not synchronize the d06 to AES, you may buy such option from
Junger Audio. Pls contact your local dealer for details.

GPI REMOTE
IN/OUT

POWER INPUT

IEC mains input connector 85-264V, 50/60 Hz with integrated fuse

REMOTE

serial remote interface RS-422 (232)
connector: 9pin SUB-D, female

GPI

parallel remote interface
TALLY-out open relay contact

connector: 25pin SUB-D, female
GPI-in optical coupler +3,5…+30V
connector: 15pin SUB-D, female

digital input CH 1/2 (AES/EBU, 44,1...48 kHz)

(AES, 44,1...48 kHz) Digital inputs are connected via sample

rate converter

(WCLK, 44,1...48 kHz) Digital inputs are connected via sample
rate converter

inputs are connected via sample rate converter

SERIAL
REMOTE

DIGITAL
I/O

SYNC IN
WCLK OUT

ANALOGUE
I/O

operation manual d06, chapter 3 - Installation - page 2 of 10

3. INSTALLATION

SYNC
SYNC IN input for ext. sync signals :

AES 3 format, 75 Ohm, unbalanced
video sync (black burst), 75Ohm, unbalanced
word clock (TTL level), 75Ohm, unbalanced
Connector : BNC socket

WCLK OUT output for word clock (system clock of d06)
(TTL level), 75Ohm
Connector : BNC socket

DIGITAL IN
AES/EBU standard format

Connector : XLR female

DIGITAL OUT

AES/EBU standard format
Connector : XLR male

ANALOG IN/OUT
Analog input 24bit A/D-converter

floating, balanced
Connector : XLR female
Analog output : 24 bit D/A-converter
Floating, balanced
Connector : XLR male

The analogue audio inputs are RFI filtered. Analog I/Os are balanced and
floating like transformer coupled devices. All the audio connectors are via rear
panel mounted connectors. Standard XLR connectors are used. These are
always wired to the AES standard:

pin 1 X Shield
pin 2 L Live audio 0°
pin 3 R Return audio 180°.

Balanced connections are preferred whenever the other equipment provides
balanced inputs/outputs. All line level connections should be wired with twin
shielded cable for low noise and reliability. The shields of the cable should be
connected at one end only. Input cable shielding therefore needs to be
derived from the signal source end as pin 1 is ground lifted for low frequencies
at the inputs.

If the equipment that drives the digital audio level processor d06 has
unbalanced outputs you must add a wire jumper to connect Pin 1 of the XLR
to Pin 3.
If the equipment connected to the d06 has unbalanced inputs only, we
recommend to use a balanced (i.e. 2 core shielded) cable where Pin 1 and
Pin 3 are connected in the XLR plug end away from the digital audio level
processor d06.

3.7.1

AUDIO
CONNECTIONS

operation manual d06, chapter 3 - Installation - page 3 of 10