Galaxy Audio DS-CP22 User Manual
DS-CP22
USER’S MANUAL
IN
DS-C P22
OUT
COMPRESSOR
PARAMETER
ESCAPE
Dual Channel Compressor Limiter
USB
19"
(482mm)
DIGITAL
DIGITAL
USB
Contents
Contents
Introduction..........................................................................................1
Safety Instructions................................................................................ 2
Overview........................................................................................ 3 - 8
Getting Started with Front Panel Controls.................................... 9 - 24
Using the PC Interface.................................................................. 25 - 33
Input Meter Table......................................................................... 34 & 35
Comp/Limiter Activity Meter Table........................................................ 36
Block Scheme..................................................................................... 37
Specifications..................................................................................... 38
Introduction
Introduction
Thank you for choosing a Galaxy DSPOT Digital Signal Processor. You have joined
hundreds of thousands of other satisfied Galaxy customers. Since 1977 Galaxy Audio’s
professional experience in design and manufacturing ensure our products' quality,
performance and reliability.
For the most up to date manual and information
visit www.galaxyaudio.com.
1
Safety Instructions
Safety Instructions
This symbol indicates that dangerous voltage
Constituting a risk of electric shock is present
within this unit.
READ these instructions.
1.
KEEP these instructions.
2.
HEED all warnings.
3.
FOLLOW all instructions.
4.
DO NOT use this apparatus near water.
5.
CLEAN ONLY with dry cloth.
6.
DO NOT block any ventilation openings. Install in accordance with the manu-
7.
facturer's instructions.
DO NOT install near any heat sources such as radiators, heat registers, stoves,
8.
or other apparatus (including amplifiers) that produce heat.
DO NOT defeat the safety purpose of the polarized or grounding-type plug. A
9.
polarized plug has two blades with one wider than the other. A grounding type
plug has two blades and a third grounding prong. The wider blade or the third
prong are provided for your safety. If the provided plug does not fit into your
outlet, consult an electrician for replacement of the obsolete outlet.
PROTECT the power cord from being walked on or pinched, particularly at plugs,
10.
convenience receptacles, and the point where they exit from the apparatus.
ONLY USE attachments/accessories specified by the manufacturer.
11.
IMPORTANT SAFETY INSTRUCTIONS !
!
This symbol indicates that there are important
Operating and maintenance instructions in the
Literature Accompanying This Unit
12.
UNPLUG this apparatus during lightning storms or when unused for long periods of
13.
time.
REFER all servicing to qualified service personnel. Servicing is required when the
14.
apparatus has been damaged in any way, such as power-supply cord or plug is damAged, liquid has been spilled or objects have fallen into the apparatus, the apparatus
has been exposed to rain or moisture, does not operate normally, or has been
dropped.
DO NOT expose the apparatus to dripping and splashing. DO NOT put objects filled
15.
with liquids, such as vases, on the apparatus.
16.
Remove the batteries from the receiver if the system will not be used for a long
period of time. This will avoid any damage resulting from a defective, leaking
battery.
17.
DO NOT throw used batteries into a fire. Be sure to dispose of or recycle used
batteries in accordance with local waste disposal laws.
USE only with a cart, stand, tripod, bracket, or table
Specified by the manufacturer, or sold with the
Apparatus. When a cart is used, use caution when
moving the cart/apparatus combination to avoid
injury from tip-over.
2
Overview
Below are the controls and functions of the front panel control buttons and encoders for the DS-CP22.
PARAMETER
5
6 7 8 9 10
DS-C P22
COMPRESSOR
1 2
IN
OUT
3
4
1 - Input Level: Analog Input Gain Left/Right
2 - Button Compressor IN/OUT: RMS Compressor Active/Bypass
3 - Output Level: Analog Output Volume Left/Right
4 - LCD Display
5 - LED Clip: Input/Process Overflow
6 - Enc Parameter: Adjust Parameters Value
7 - Enter Key: Access to Editing Pages and Parameter Values Confirm
8 - Enter LED Indicator
ESCAPE
11 12
13
9 - Enc Navigation: Compressor's Ratio and Knee selection
10 - Escape Key: Exit from Editing Pages
11 - Escape LED Indicator
12 - Power LED
13 - Power
3
The DS-CP22 is a Stereo RMS Compressor and Peak Limiter with the addition of a Noise Gate, an
AGC, a 7 bands Eq and a Sub Harmonic Synthesizer.
With reference to the following RMS Compression process representation:
The DS-CP22 implements a REAL RMS Compressor, compressing a pure sinusoidal signal at the
same threshold as a squared wave.
Particularly, the RMS Compressor is a Compression process applied with fast Slow Attack and
Release times to the INPUT signal of a Unit, in order to maintain the amplitude of the OUTPUT
signal at a defined level when input level exceeds a defined Threshold.
The Compressor implemented in the DS-CP22 reacts to the RMS value of the input signal,
resulting in a more musical compression.
The DS-CP22 Compressor has adjustable Ratio and Hard/Soft Knee parameters. The input to
output ratio is accurate to 0.1dBu.
4
The Hard Knee and Soft Knee allow for instant or gradual compression once threshold is reached.
Together with the RMS Compressor, the DS-CP22 also includes 2 very useful Dynamic Processes,
An Automatic Gain Controller (AGC) and a Peak limiter.
In order to understand the operation of the AGC, please refer to the following graphic:
The AGC is an Expansion/Compression process applied with fairly slow Attack and Release times
To the INPUT signal, in order to maintain the average amplitude of the OUTPUT signal at a defined
level, independently from the averaged amplitude of the input sources.
The AGC expands the signal when below the threshold setting, and compresses when above the
threshold setting.
The process uses RMS levels resulting in a more musical sounding process. The AGC process is
useful in maintaining a consistent output level.
The Speed and the amount of the Expansion can be defined through the “Exp Time” and
“Exp Ratio” parameters. The speed and the amount of the Compression can be defined through
the “Cmp Time” and “Cmp Ratio” parameters.
When the Signal coming out from the AGC process (Output), applied to the AGC input, is above the
“Exp Thr” and below the “Thr Hold”, it is expanded up to the max expansion coefficient defined by
the Exp Ratio.
When the Signal coming out from the AGC process (Output), applied to the AGC input, is above the
“Cmp Thr”, it is compressed up to the minimum compression coefficient defined by the
“Cmp Ratio”.
When the AGC output is comprised within the “Thr Hold” and the “Cmp Thr” Thresholds, no further
expansion or compression actions will be taken and the expansion/compression coefficient, will be
maintained with its current value.
If the averaged AGC output level is “entering” the signal “hold” area coming from the
expansion area, then the Coefficient computed by the AGC for multiplying the input level in order to
get the proper output signal, will be higher than one (if the “Exp Ratio” will be set at 1:2), and the
coefficient will be lower than one (if the “Cm Ratio” will be set between 2:1 and 16:1) if the
Averaged AGC output level is “entering” the signal “hold” area coming from the compression area.
5
The last dynamic process available with the DS-CP22, is a Peak Limiter. This is useful when used
before an amplifier to limit the signal to avoid over-driving the amplifier input, or to help protect
speakers from excessive level.
This kind of Limiter is acting on the Signal Peak detection and therefore the limiting is on the output
Peak value.
6
In addition to the Dynamic Processes, in the DP-CP22 there is also a Sub Harmonic Synthesizer
available.
The Sub Harmonic Synthesizer generates sub Harmonics based on the Harmonic content of the
original signal.
The amplitude distribution of the generated Sub Harmonics follows the shape of a band
pass filter set on the low part of the band.
The peak of this “band pass” filter, is centered on 2 possible frequencies, 60Hz and 90Hz. Setting
the filter peak at 60Hz (24-36Hz), the Harmonics added to the original sound will bring a “deep” and
very low extra body to the original sound.
Setting the filter peak at 90Hz (36-56Hz), the Harmonics added to the original sound will bring a
“lighter and more booming” extra body to the original sound.
Finally, the DS-CP22 includes 7 bands of equalization:
A 1st or 2nd Order Highpass, a 1st or 2nd Order Lowpass, and 5 bands of 1st or 2nd Order
Peaking/Shelving filters.
The DS-CP22 has a bypass control which bypasses the entire digital process.
7
Input and Output Level
The Input and Output levels of the DS-CP22 can be adjusted by Analog Potentiometers.
The potentiometers operate in the analog domain before the A/D converter (Input Level) and after
The D/A converter (Output Level). There is not an absolute and fixed relationship between the
Input and Output Levels and the levels in front of the A/D and after the D/A converters.
5
4.5
5.5
MAX
OUTPUT
LEVEL
6
6.5
7
7.5
8
8.5
9
9.5
2.5
2
1.5
3.5
3
1
0.5
MIN
4.5
4
INPUT
LEVEL
5
5.5
MAX
6
6.5
7
7.5
8
8.5
9
9.5
4
3.5
3
2.5
2
1.5
1
0.5
MIN
Figure A Figure B
The figures A and B are show in detail the possible positions of the potentiometers controlling the
Analog Input and Output Level.
Referring then to the above precise divisions of the available range between the MIN and MAX
Position of the potentiometers, the Max Analog Input/Output levels can be understood, so the
proper setting for the best use of the RMS Compressor can be found.
8
Getting Started
Getting Started
As soon as the DS-CP22 is turned ON the device model name will appear in the LCD screen:
DS-CP22
Compressor Limiter
And after quickly showing the “Firmware Version X.XXX”, the LCD will show the “Input Level” Page.
The default level is indicated by graphic meters.
Input Level
A: |||||||||| B: ||||||||||
When the Input Level reaches clipping, the symbol ”>” will appear (as on channel B in the
example).
From this initial condition, and if an RMS Compressor or a Peak Limiter (or both) are set to be
Active, their compression/limiting activity can be seen on the “Compressor Activity” and “Limiter
Activity” windows. This is accessible from the Input Level page by rotating the NAVIGATION
encoder clock/counter-clock wise once.
If from the Input level window, the user wants to see the RMS Compressor ’s activity, rotate the
NAVIGATION Encoder clockwise twice, accessing the following screen:
Compressor Activity
A: |||# B: ||||||#
Here, the compression activity is shown from right to left, indicating the amount of compression.
For the relationship between the bars in the Input Level, Compression/Limiting Activity windows,
Input signal level, and compression depth, refer to the tables.
9
Encoders and ENTER, QUIT buttons
The DS-CP22 is equipped with 2 Relative Encoders, “PARAMETERS” and “NAVIGATION”. These
Encoders are used to navigate the user interface and edit sections of the processor. They allow the
User to navigate within the screen for the selection of sub-menus, pages and parameters, and to
select the values to be assigned during the editing operations.
The “ENTER” and “QUIT” buttons allow the user to confirm or NOT confirm the operations
performed by the encoders.
Particularly, the “ENTER” button is used to enter the editing pages from the initial Input Level and
Compressor/Limiter Activity screens.
The “QUIT” button is used to get back from any editing page to those screens.
From any one of the Initial windows, the editing menus and pages can be accessed by pressing the
“ENTER” button.
Once leaving the Input Level and Compressor/Limiter Activity windows, the screen will show on the
top row, the currently running preset and name, and on the lower row, the sub-menu for the
DS-CP22 functions/parameters access and editing.
Once leaving the Input Level and Compressor/Limiter Activity windows, if the currently running
Preset is the number 16 called “DeepCmp”, the screen will then appear as follows:
Preset 16 DeepCmp
Load Preset
To access all sub-menus you just need to rotate the NAVIGATION Encoder counter-clock wise.
The available Sub-menus are:
˜Load Preset: Loading one of the 32 available presets (16 factory and 16 users)
˜Save Preset: Store up to 16 user presets
˜Utility Function: Communication Interface setting (USB or MIDI)
˜Edit Parameters: Access to the parameters’ editing of all the DS-CP22 processes
10
Load Preset - this page allows the Loading of a preset program from one of the 16 factory presets
(1-16) or from one of the 16 user presets:
Preset 16: DeepCmp
Load Preset
By pressing ENTER and rotating the “NAVIGATION” encoder, it is possible to scroll through all
current available user presets.
Load Preset
<Preset:21 AGC_Fat>
If the Preset 21 is chosen (AGC_Fat), then pressing the “ENTER” button, the current temporary
window will appear,
Wait : Loading . . . . . .
<Preset:21 AGC_Fat>
And the AGC_Fat preset number 21 will be loaded and the sub-menu page will go back to the
previous level, updated:
Preset 21: AGC_Fat
Load Preset
Save Preset: this page allows you to store a new preset, up to 16, in the DS-CP22’s memory from
location 17 up to location 32, skipping the locations 1 to 16 that are reserved to the Factory
presets:
Preset21: AGC_Fat
Save Preset
By pressing the ENTER button and rotating the “PARAMETERS” encoder, it is possible to scroll
through the previously saved presets and the available empty locations (identified by “Empty”).
If no user presets are stored, the “Save a Program” screen will show empty memory locations for
All 17-32 presets as shown in the example below for location 30:
Save Preset
<Preset:30 Empty >
11
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