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Attention
Please carry on the operation according to the below security principle to protect C-MARK DRD28A
audio processor from potential damage and guarantee your safety.
When operating DRD28A audio processor and system
When operating DRD28A audio processor and system, Please carry on the operation
according to the below security principle:
Warning: Please do not operate C-MARK DRD28A audio processor when the processor
protecting cover is unloaded.
l In order to avoid damaging C-MARK DRD28A audio processor, please guarantee the voltage on
power supply equipment to be the same with the AC power supply at your location.
In most north and south Americas and some Far East countries and regions in , for
example, Japanese, South Korean and Taiwan, the voltage is 115V/60Hz
While in most countries in Europe, the Middle East and Far East, the voltage is 230V/50Hz ,
please guarantee that rated voltage value of the additional auxiliary equipment to be set in
accordance with alternating current power supply in your area.
l Before carrying on internal installation of C-MARK DRD28A processor, please remove the power
supply plug first to avoid electric shock or damaging the motherboard. For some motherboards, as
long as the main engine is connected with the alternating current supply, a continuous circuit flowing
will be available.
l Please do not try repairing C-MARK DRD28A audio processor by yourself, unless you are a
technician and have accepted special training. Please operate strictly according to the installation
instruction.
l In order to avoid electric shock, please connect the power supply cables of C-MARK DRD28A
processor and ancillary equipment to the power socket which grounding correctly. These cables all
have three-phase plugs to guarantee the correct grounding. Please do not use the transfer plug, nor
unload power supply cable's grounded feet. If the extension power supply cable must be used,
please use the three-line cables with correctly grounded plug.
l To avoid potential electric shock, please do not use C-MARK DRD28A under thunderstorms.
l To avoid potential electric shock, please do not connect or disconnect any cable, nor repair or
reconfigure this product.
l Before cleaning C-MARK DRD28A audio processor, please disconnect it from the power supply
socket. Clean the DRD28A with a soft cloth or a brush with soft feathers. Do not use fluid or spray
detergent because they may contain corrosive or inflammable materials.
l To avoid potential damage to the system mother board, please wait 10 seconds after powering off
the DRD28A processor. Then disconnect the devices from DRD28A.
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l Please use high-quality surge protectors, voltage regulation, and/or an uninterruptible power supply
(UPS) to avoid instantaneous high- or low-voltage damage to the DRD28A.。
l Make sure there is no strain on the cables to avoid trampling them and stumbling.
l Never push objects of any kind through the openings of the DRD28A, as this may cause an interior
short circuit and may result in fire, electric shock, or other hazards.
l Do not use the DRD28A near a source of heat and do not block its cooling vents. Do not operate the
DRD28A on any surface which could create a risk of scorching or fire, such as fabric or paper.
l Do not use the DRD28A near water or other liquids, or in rainy/moist situations. If liquid gets into
your DRD28A, turn it off and take it to your dealer for inspection.
Technical instruction:
Note: Trademarks and names mentioned in this manual belong to Shenzhen Bao Ye Heng Industrial
Development Co.,Ltd. There may be description or typographical errors in the technical specifications of
the manual.
l Because of fast development of science, our products are always being improved and updated. So
some specifications in this manual may be out of date and inapplicable. Hope you understanding.
l We make the manual seriously, but we don't guarantee that there are not any negligence and errors.
Maybe we will issue updated ones. The information contained in this manual is subject to
modification without notice.
l The modification information contained in this manual will be issued in time on
www.c-markaudio.com Please visit our website for the latest documentation.
Warning: Do not attempt to repair this equipment by yourself. Otherwise it can damage devices
and what's worse, hurt people, etc.
l The labels on DRD28A show information about its production and sales, which are very important
for cognizance technology of the manufacturer and maintenance.
l
l The labels on DRD28A are the criterion of lifelong service. If they're tore up, it will make it difficult
to judge its guarantee period.
l
l If any problem with the DRD28A sound processor, please contact your supplier. You can also
contact our technician for technical support.
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ABOUT THIS GUIDE
This manual will help you to become acquainted with the functions of the DRD28A
processor by presenting recommended procedures for installation, configuration, operation,
and maintenance. If you encounter any problems, or if this is your first use of
U.S.A.C-MARK LIGHT& AUDIO INC's DRD28A, please read this manual first for relevant
information and technical support. Note that some descriptions and illustrations in the
manual may not correspond to your product because of interim updates. Please visit
http://www.c-markaudio.com from time to time for the latest documentation.
How to use this manual
Reading this manual from beginning to end is not mandatory, but by doing so, you will receive
All of the information needed to install, operate, and maintain the DRD28A. A Table of Contents,
Glossary, and Index are provided for your convenience.
* For first-time users:
We recommend you read all of the contents of the manual and observe the Notes, Cautions, and
Warnings.
During hardware installation, refer to the safety guidelines in the manual.
* For system administrators and operators:
System administrators and operators may read the sections necessary for operating the DRD28A.
Please refer to the General Description section of the manual for more information. If the content of the
manual can't solve the problem, please contact the facility's technical support personnel or professional
engineers authorized by Shenzhen Bao Ye Heng Industrial Development Co., Ltd for assistance.
* For qualified engineers:
Because C-MARK products are continuously updated, please check the updated information on our
service and support website.
General description
Part 1: Synopsis of DRD28A audio processor, which includes the main features and hardware
configuration.
Part 2: Technical specifications, which includes the applicable modes and operation steps.
Part 3: System installation includes the specifications for various interfaces and their dimensions.
Declaration and provisions
The manual does not provide any form of guarantee, clear or implied, including but not limited to, implied
guarantees or a special-purpose commercial reasonableness. In some areas of specific transactions a
clear or implied guarantee is not allowed, therefore, this statement may not apply to you.
The manual may contain technical inaccuracies or typographical errors terminology. Identify changes
and updating information regularly updated content will be updated to version. Bao Ye Heng may make
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improvement or updates for the products and procedures described in this document, at any time as it
sees fit.
The manual applies to DRC Network Audio Transmitters configured with different channels.
For more technical information, please consult your Shenzhen Bao Ye Heng Industrial Development Co.,
Ltd sales representative and retailers.
The usage, reproduction and distribution of this manual are subject to Shenzhen Bao Ye Heng Industrial
Development Co., Ltd provisions. Without the prior written permission obtained from Bao Ye Heng, this
manual shall not be reproduced and distributed.
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Chapter 1 introduction of DRD28A audio processor
The DRD28A audio processor is a 1U device with multifunction of signal mixing, route, equalizer, etc,
which simultaneously handles up to 8 channels analog signal with Line/Mic input.
With an internal 200 MIPS SHARC processor, it processes audio signals with 40-bit floating-point
precision by using C-MARK DRD28A software.
Therefore DRD28A audio processor is capable of processing high quality audio signal. It has been
widely applied in various occasions, including professional and entertainment applications.
1 C-MARK DRD28A FEATURES
l DSP processor with powerful computation function;
l Support the computation of 40-bit precision floating-point;
l Various built-in audio computation processing modules;
l 8 analog inputs, 8 analog outputs;
l The gain for each Mic/Line input channel is from 0dB to +66dB;
l The 48V Phantom power supply of each channel can be controlled separately;
l 8 different DSP processing modes, which can be optionally set through front panel;
l It can be configured in a PC based on Windows system, simple operation and easy to
understand;
l Suitable for various applications.
2 DSP PROCESSING FUNCTIONS
l Delays: 50 ms, 100 ms, 200 ms, 500 ms, 1000 ms;
l Routers: 4×4, 8×8, 16×16;
l Mixers: 4×1, 4×2, 4×4, 8×1, 8×2,8×4,8×8 mixers
l Dynamics: Levelers, Compressors, Limiters, Noise Gates, Expanders, Clipper;
l Signal Generator: Sine, White Noise, Pink noise;
l Equalizers: Parametric Equalizers, Graphic Equalizers;
l Filters: High-pass, Low-pass, Low-pass shelving, High-pass shelving;
l Crossovers: 2-way, 3-way, 4-way;
l Level Meters: Level Meters of 1-channel, 2-channels, 8-channels.
3 FRONT PANEL INTRODUCTION
C-MARK DRD28A The front panel layout shown below:
1— LCD display
The initiation information is shown when starting the device.
After device starting is completed, the current pre-installation pattern is shown;
Relevant contents will be shown through the rotation of program selection button.
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2— Preset program selection button
Select different modes of interface through rotation button. Pre-set program, input channel set and
output channel set are three tacitly approved modes.
Set the above 3 modes of interface by pressing “Down”
(1) Select the needed mode from the 01-08 pre-set modes; when selecting the mode for
changing current pre-set program, “changing mode, please wait…” will be displayed on the LCD
screen. Later it will show the sequence No. and name of the selected program mode.
(2) Set the diameters Of input channel: diameters like input channels sequence No. (IN 1-8),types of
audio input（Line/Mic）,Line property(Sensitivity and Trim),Mic property(gain and phantom power
switch)and norm/anti can be set.
(3) Set the diameters Of output channel: diameters like output channels sequence No. (OUT
1-8),level value(Db), MUTE- Y/N，norm/anti can be set.
3—Corresponding LED light for 1-8 signal input channels
Green light means signal input is available in the channel;
Red light signifies channel examination when starting the device, while after device started; it means
the channel input signal level exceeds the preset threshold.
4—Corresponding LED light for 1-8 signal output channels
Green light means signal output is available in the channel;
Red light signifies channel examination when starting the device, while after device started, it means
the channel output signal level exceeds the preset threshold.
4 Rear panel instructions
C-MARK DRD28A Rear panel shown as below:
1—Power supply plug 100-240V AC 50/60Hz
2—Power supply switch ON/OFF
On means power connected, off means cut off
3— RS232
The DB9 female head can be interconnected to computers or other equipment through the RS232
agreement.
4— RS485
DB9 female head，can be interconnected to computer or other equipment through the RS485
agreement.
5— External control interface
DB25 female head can control the internal part of the processor through GPI0 signal.
6—Input interfaces 1,2,3,4
Two channels for each input interface, which input audio signal to DRD28A audio processor.
7—Output interfaces 1,2,3,4
Two channels for each output interface, which output audio signal to DRD28A audio processor.
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5 Application
Because C-MARK DRD28A can provide users with high quality audio signals, it has a wide application,
which can match the demand of sound reinforcement for most professional fields and social
entertainment.
Professional fields:：
■Broadcast and television ■Live concert
■Recording room ■Professional performance venue
■Stadiums
Social entertainment:
■Station ■Subway
■Airport ■Convention center
■Amusement place ■Theme park
■Intelligent building
Chapter 2 Technical specifications
1 Analog signal input specifications
l The analog signal input is transformed into 24-bit and 48 kHz digital signal
l Frequency response: +/-0.2dB, 20Hz~20 kHz
l Highest gain: +66dB
l Phantom power supply: +48V DC (10mA/output)
l Dynamic range: 103dBA, 101dB
l Highest input level: +30dBu, balanced differential motion
l Input impedance: 6.3kohms
2 Analog signal output specifications
l 24-bit and 48khz digital signal is transformed into analog signal output;
l Frequency response: +/-0.2dB,20Hz~20kHz
l THD+N: <0.05% @4dbu 1KHz；
l Phantom power supply: +48V DC (10mA/input)
l Dynamic range: 103dBA,101dB
l Highest output level: +24dBu, balanced differential motion
l Output impedance: 100ohms, able to drive at least 600ohm load
3 Interface specifications
l 1 RS232 interface (9 pin female)
Interface schematic drawing is on the right
Pin definition:
1,4,6,7,8,9: NC, undefined
2: RX Data data receiving
3: TX Data data transmitting
5: Groundings
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291mm
44.5mm
430mm
430mm
l 1 RS485 interface (9 pin female)
Interface schematic drawing is on the right
Pin definition:
1,4,6,7,8,9: NC, undefined
2: RX Data data receiving
3: TX Data data transmitting
5: Groundings
l 1 GPIO external control interface (25 pin female heads, this interface has not yet been defined)
l 8 line input
l 8 line output
4 Other specifications
l Power supply: 110-240V AC,40~60hz
l RMS Power: less than 30W
l Temperature: +5-40°C
l Humidity: 5-85%
5 Size specifications
l Size (length x width x height): 430mm x 291mm x 44.5mm (rack not included)
l The size schematic drawing is as follows
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Chapter 3 System installation
C-MARK DRD28A equipment is simple to be installed and used. You only need to connect C-MARK the
DRD28A to a computer with the serial port cable. Then by operating the software of the computer, the
processing and setup of 8 channels’ audio signal input can be achieved.
A consolette can be set up through software control of C-MARK the DRD28A. It is suggested that this
mode be used in small audio amplifying fields.
The operation and installation steps are as follows:
Step 1:
Connect C-MARK DRD28A equipment with the computer directly through a serial port cable, and
connect the audio source input to the Line/MIC input interface of C-MARK DRD28A rear panel,
and connect the external amplifying device to the output interface of the rear panel (shown as the
following schematic drawing).
Line/
Mic input
Computer
Audio signal processors
Amplifiers
Serial cable
Audio cable
Step 2:
Switch on C-MARK DRD28A equipment, then wait for the lighting of its LCD screen and all indicating
light, and enters the normal working condition.
Step 3:
Add C-MARK DRD28A to its software. For more details, please refer to the chapter four “Fast
installation setting of the control software”.
Step 4:
Adjust the parameter setting of C-MARK DRD28A DSP processor through the DRD28A software in
line with application requirement.
Step 5:
By downloading current DSP parameter setting, the DRD28A can work seperately according to the
setup parameter, with computer control no longer needed.
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FAQ Answers to frequently asked questions
1．What features does C-MARK DRD28A has?
C-MARK DRD28A audio processor has 8 analog input and 8 analog output ports. It can
simultaneously process 8 channels signal through the analog input, and output the signal to the
corresponding port. Point to point or point to multipoint signal transmission can be realized。
Specially designed DRD28A software helps the testers to carry on the system setting conveniently.
This software is direct-viewing. By dragging the mouse, you can complete may complete the
parameter setting of the audio signal transmitting. All the parameter settings are solidified in the
equipment. Once the setting is completed, the system can work separately from the computer.
2．What is the delay for C-MARK DRD28A?
The delay can reach 87s when the signal is transmitted through C-MARK DRD28A.
3．Must there be a real-time connection between C-MARK DRD28A software system and C-MARK
DRD28A system?
No. Each DRD28A equipment has memory cells, once the route connection setting is completed, we
only need to download and solidify this setting information to C-MARK DRD28A equipment, and the
DRD28A system will run separately, without any connection to the computer.
4．In which fields can C-MARK DRD28A be applied?
C-MARK DRD28A audio processor can be widely used in fields such as stadiums, schools, hotels,
parks.
5．Why can not C-MARK DRD28A software work properly?
Check whether C-MARK DRD28A software has been installed.
6．Why can not the route configuration information be downloaded to correctly to the DRD28A
equipment?
Please check whether the equipment is online, or whether the parameter configuration in software is
consistent with the actual parameters or the equipment is connected correctly.
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Appendix A Control protocol
1. Control functions
1.1 Input
l “Line input” volume adjustment
l “Mic input” volume adjustment
l “Mic and line input” switch
l “Mic +48V” power on/off
l “Input mute” on/off
l “Input signal phase” normal/reverse
1.2 Output
l “Output” volume adjustment
l “Output mute” on/off
l “Output signal phase” normal/reverse
1.3 Save/call
l “Save” adjusted data
l “Call” the mode saved beforehand
2. Precondition
The current mode belongs to one of the 8 modes, instead of real-time control mode; and the operation
channel is valid.
3. Control protocol command description
3.1．SETIN——input hardware control
Command: *SETINaabcdee#
Return code: *OK#
Parameter Function Width (byte) Value
aa input channel number 2（DEC） 01~08
b mic or line 1（DEC） 0~1 (1=MIC, 0=LINE)
c phantom power 1（DEC） 0~1 (1=on, 0=off）
d input sensitivity 1（DEC） 1~4 (1=30dBu, 2=24dBu, 3=18dBu, 4=12dBu)
ee gain position 2（DEC） MIC or LINE, determined by parameter b
NOTE 1:
For parameter b: b=1 (when MIC), parameter d is irrelative.
b=0 (when LINE), it is requested that c=0, ee=16, that is turn off phantom power, and hardware trim is 0.
NOTE2:
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For parameter ee: b=1 (when MIC), the range is 0~71 (15db~50.5dBu), increased by 0.5db each step.
b=0(when LINE), it is requested that c=0, ee=16, that is turn off phantom power, and hardware trim is 0.
3.2.GETIN——get input hardware control
Command: *GETINaa#
Return code: *GETINaabcdee#
Parameter Function Width (byte) Value
aa input channel number 2（DEC） 01~08
b mic or line 1（DEC） 0~1 (1=MIC, 0=LINE)
c phantom power 1（DEC） 0~1 (1=on, 0=off）
d input sensitivity 1（DEC） 1~4 (1=30dBu, 2=24dBu, 3=18dBu, 4=12dBu)
ee gain position 2（DEC） MIC or LINE, determined by parameter b
3.3.STINV——phase setting
Command: *STINVxaab#
Return code: *OK#
Parameter Function Width (byte) Value
x input or output 1（DEC） 0~1 (0=input, 1=output)
aa channel number 2（DEC） 01~16
b reversed phase parameter 1（DEC） 1= reverse phase, 0=NOT reverse phase
3.4.GTINV——get phase
Command: *GTINVxaa#
Return code: *GTINVxaab#
Parameter Function Width (byte) Value
Refer to the “phase setting” part above.
3.5.SMUTE——mute setting
Command: *SMUTExaab#
Return code: *OK#
Parameter Function Width (byte) Value
x input or output 1（DEC） 0~1 (0=input, 1=output)
aa channel number 2（DEC） 01~16
b mute parameter 1（DEC） 1=mute, 0=NOT mute
3.6.GMUTE——get mute
Command: *GMUTExaa#
Return code: *GMUTExaab#
Parameter Function Width (byte) Value
Refer to the “mute setting” part above.
3.7 STLEV——level setting
Command: *STLEVxaabbb#
Return code: *OK#
Parameter Function Width (byte) Value
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x input or output 1（DEC） 0~1 (0=input, 1=output)
aa channel number 2（DEC） 01~16
bbb level parameter 3（DEC） No.000~223 （-99.5~+12dBu, increase 0.5dBu for
each step）
3.8.GTLEV——get level
Command: *GTLEVxaa#
Return code: *GTLEVxaabbb#
Parameter Function Width (byte) Value
Refer to the “level setting” part above.
3.9.SOTML——output amplitude setting
Command: *SOTMLxaab#
Return code: *OK#
Parameter Function Width (byte) Value
x fixed as output 1（DEC） 1 (1=output)
aa channel number 2（DEC） 01~08
b output amplitude parameter 1（DEC） 1~4 (1=24dBu, 2=18dBu, 3=12dBu, 4=6dBu）
3.10.GOTML——get output amplitude
Command: *GOTMLxaa#
Return code: *GOTMLxaab#
Parameter Function Width (byte) Value
Refer to the “output range setting” part above.
3.11.SAVEA——save all adjusted parameters
Command: *SAVEA#
Return code: *OK#
3.12.CHANM——change current processing mode
Command: *CHANMaa#
Return code: *OK#
Parameter Function Width (byte) Value
aa mode number 2（DEC） 01~08
3.13.GETCH——get processed input/output channel configuration and mode number
Command: *GETCH#
Return code: *GETCHxxxxxxxxyyyyz#
Parameter Function Width (byte) Value
x input channel validity 8（DEC） 0~1 (0=invalid, 1=valid)
(8 x correspond to 4 local+4 network stereo)
y output channel validity 4（DEC） 0~1 (0=invalid, 1=valid)
(4 y correspond to 4 output stereo)
z current mode number of control PC 1（DEC） 0~8 (0=real time adjustable mode, instead of
solidified mode)
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安全说明
感谢您使用 C-MARK DRD28A 音频处理器产品 ！
融合了人性化高科技的技术精华，C-MARK DRD28A 音频处理器产品将给您一个全新的应用体验。
请遵循以下安全原则，以保护您的C-MARK DRD28A 音频处理器产品和工作环境避免潜在的损坏危
险，并可确保您的人身安全。
在使用C-MARK DRD28A 音频处理器产品或系统时
在使用您的C-MARK DRD28A音频处理器产品时，请按照以下安全原则进行操作：
警告：请勿在卸下机箱护盖时使用操作 C-MARK DRD28A 音频处理器产品。
l 为避免损坏C-MARK DRD28A 音频处理器产品，请确保电源设备上的电压设定与您所在地的交流电源相
同：
—在多数南北美洲和一些远东国家和地区，例如，日本、韩国和台湾地区为115V/60Hz
— 在欧洲、中东和远东的多数国家为230V/50Hz
同时，请确保附加外围设备的电压额定值也按照您所在地区的交流电源进行设置。
l 在进行C-MARK DRD28A 音频处理器产品内部安装之前，请先拔下电源插头，以避免触电或损坏主板。
有的主板只要是主机连接在交流电源上就会继续通电。
l 请勿尝试自行维修C-MARK DRD28A 音频处理器产品，除非您是经培训的维修技术人员。请始终严格按
照安装说明进行操作。
l 为避免触电，请将C-MARK DRD28A 音频处理器产品和周边设备的电源电缆连接至已正确接地的电源插
座。这些电缆均配有三相插头以确保正确接地。请勿使用转接插头，也不要卸下电缆的接地插脚。如
果必须使用延长电缆，请使用带有正确接地插头的三线电缆。
l 为避免潜在的电击危险，请勿在雷暴期间使用C-MARK DRD28A 音频处理器产品。
l 为避免潜在的电击危险，在雷暴天气时请勿连接或断开任何电缆，也请勿维修或重新配置本产品。
l 在清洁C-MARK DRD28A 音频处理器产品之前，请断开C-MARK DRD28A 音频处理器产品与电源插座的连
接。用一块干燥的软布或是带软毛的板刷来清洁C-MARK DRD28A 音频处理器产品，请勿使用液体或喷
雾清洁剂，它们可能含有腐蚀性或易燃物质。
- 15
l 为避免可能对系统主板造成损坏，请在关闭C-MARK DRD28A 音频处理器产品后等待 10 秒钟，然后再
从C-MARK DRD28A 音频处理器产品上断开设备的连接。
l 为保护您的C-MARK DRD28A 音频处理器产品免受电压瞬间升高或降低所导致的损坏，请使用电涌保护
器、线路调节器或不间断电源设备 (UPS)。
l 请确保没有任何物品压在C-MARK DRD28A 音频处理器产品电缆上，并避免将电缆放在容易被踩踏或绊
到的地方。
l 请勿将任何物品塞入C-MARK DRD28A 音频处理器产品的开口处，否则可能会导致内部组件短路而引起
火灾或触电。
l 将C-MARK DRD28A 音频处理器产品置于远离暖气片和有热源的地方。另外，请勿堵塞冷却通风孔。不
要将纸张垫在C-MARK DRD28A 音频处理器产品下；也不要将C-MARK DRD28A 音频处理器产品置于封闭
式无通风环境内或放置在床、沙发或地毯上。
l 请勿将食物或液体溅落在C-MARK DRD28A 音频处理器产品上。
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寻求技术支援
警告：请勿自行维修设备，否则可能会损坏设备，甚至可能导致更严重的后果，比如人身伤害等。
l C-MARK DRD28A 音频处理器产品的维护工作由生产厂家指定的维修特约单位维修。
l C-MARK DRD28A 音频处理器产品的维修必须由拥有专业资格的工程师进行，请不要直接维修您的
C-MARK DRD28A 音频处理器产品。
l 若有任何问题，请直接联络您的产品供应商，您也可以与本公司服务部技术支持人员联络，寻求技术
支持人员的支持。
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关于本手册
本手册帮助您熟悉您的C-MARK DRD28A 音频处理器产品和它的一些功能，并且告诉您
怎样安装、配置、操作和维护您的C-MARK DRD28A 音频处理器产品。如果您在使用中遇到问题，或者您是
初次使用C-MARK DRD28A 音频处理器产品，请务必阅读本手册。您可以在本手册中找到相关信息以及获得
技术支持。 由于产品的改良和更新，本手册中的某些说明或图示可能与您的硬件稍有不同，敬请谅解。
阅读本手册的方法
阅读本手册不需要特别的顺序。
您可以从一页跳到您所要信息的一页。当然，如果您从头到尾阅读本手册，您会找到一个系统的完整
使用流程。
本手册提供了目录和索引，为不同的使用习惯提供不同的查询方式。
对于第一次使用此系统的人员：
建议您务必阅读本手册的全部内容，特别要认真阅读所有标示了“注、注意和警告”符号的文字。并
且要求严格按照本手册中的说明进行操作。
在硬件安装过程中，请经常地去阅读本手册的“安全说明”部分。
对于普通使用者、系统管理员和操作员
您可以选择需要内容进行阅读。具体的手册内容说明，请参阅“本手册的内容概述”。如果在使用过
程遇到问题，而在本手册中未得到解决，请及时联络有经验的技术支持人员或经过认证的专业工程师。
对于有经验或经过认证的专业工程师
因为我们的产品一直在持续的改良与更新，请您及时并经常的关注本手册的更新部分。具体的更新说
明会被及时发布于服务与支持网站，并在下一版本的手册中加入这些更新的内容。
本手册的内容概述
第一章 “C-MARK DRD28A 音频处理器介绍说明” 主要介绍了 C-MARK DRD28A 音频处理器的主要特点、
硬件结构。
第二章 “技术规格”主要介绍了 C-MARK DRD28A 音频处理器可应用的工作模式及实际操作步骤。
第三章 “系统安装”主要介绍了 C-MARK DRD28A 音频处理器各种接口的信号规格及外部尺寸大小。
本手册声明和条款
此手册不带有任何形式的担保，明确的或暗示的，包括但不限于，暗示的商业担保或某一特殊目的的
合理性。一些地区在特定交易中不允许进行明确或暗示的担保，因此，此声明可能不适用于您。
本手册可能包含技术不准确词汇或印刷错误。此处的信息会定期更改和更新，更新的内容会加入更新
版本。本公司可能随时对此手册中描述的产品和（或）程序进行改进和更新。
本手册仅适用于C-MARK DRD28A 音频处理器。
请向本公司的销售代表或分销商咨询有关的产品技术信息。
本手册的使用、复制或散发传播受到公司的条款限制，未得到书面许可，不得擅自复制或散发传播本
手册。
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第一章 C-MARK DRD28A 介绍说明
C-MARK DRD28A 音频处理器产品是1U尺寸大小的，具有信号混合、路由，均衡等多种处理功能的一种
设备，可同时处理8路Line/Mic输入的模拟音频信号。它内建一颗200MIPS的SHARC处理器，通过C-MARK
DRD28A软件以40位浮点运算的精度来处理音频信号。因此C-MARK DRD28A设备可以处理和传输高品质的音
频信号，从而适用于多种不同的领域，包括专业场所和社会场所。
1.C-MARK DRD28A 产品特点
l 具有强大计算功能的 DSP 处理器。
l 支持 40 位精度的浮点运算能力。
l 内建多种多样的音频算法处理模块。
l 8 个平衡模拟输入，8 个平衡模拟输出。
l 每个 MIC/Line 输入通道的增益 0dB 到+66dB。
l 每个通道的 48V 幻象电源可独立控制。
l 预设 8 种不同的 DSP 处理模式并可通过前置面板进行选择设定。
l 可通过 PC 计算机基于 Windows系统进行配置，操作简单方便易于掌握。
l 可适应不同的应用需求，应用场所广泛。
2.DSP 处理器功能
l 延时器：提供 50ms，100ms，200ms，500ms，1000ms 多种延时模式。
l 路由器：4x4.8x8,16x16 路由器。
l 混音器：4x1,4x2,4x4,8x1,8x2,8x4,8x8 混音器。
l 动态处理器：包含自动增益器，压限器，限制器，噪声门，扩展器，削峰器。
l 信号产生器：可产生正弦波，白噪声，粉噪声。
l 均衡器：参数均衡器和图像均衡器。
l 滤波器：低通滤波器，高通滤波器，低通斜坡滤波器，高通斜坡滤波器。
l 分频器：2 波段分频器，3 波段分频器，4 波段分频器。
l 电平表：1 通道电平表，2 通道电平表，8 通道电平表。
3.前面板说明
C-MARK DRD28A 前面板示意图如下
1-LCD 显示屏
开机启动时显示初始化信息；
开机完成后显示当前的预设模式；
通过程序选择旋钮的转动会显示相应的内容；
2-预设程序（Program）选择旋钮
通过“旋转”旋钮选择不同模式界面，默认的有预设程序，输入通道设定，输出通道设
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定这三种界面；
通过“按下”旋钮对上述三种模式界面进行相应设置：
（1） 在预设模式 01--08 中选择需要的模式；当选择改变当前的预设程序时，LCD 屏幕会显示“ changing
mode, please wait…（正在切换模式，请稍候…）”,稍后就会显示选定的程序模式的序号和名称；
（2）对输入通道的参数进行设定；可 对 输 入 通 道 的 序号（IN 1 — 8 ），音源输入的种类（Line/Mic）,Line
属性（ 灵敏度和 Trim 值）， Mic 属性（ 增益大小和幻象电源开关）， 是 否 反 转 （ norm/anti）等进行设置；
（3） 对输出通道参数进行设定；可 对 输出通道的序号（OUT 1 — 8 ），电 平 dB 值，是否静音（ MUTE- Y/N），
是 否 反 转 (norm/anti)等进行设置；
3—输入信号通道 1—8 对应的 LED 灯
绿灯表示该通道有信号输入;
红灯在开机时表示正在检测该通道，在正常开机后表示该通道输入信号电平超出预设的阀值；
4—输出信号通道 1—8 对应的 LED 灯
绿灯表示该通道有信号输出；
红灯在开机时表示正在检测该通道，在正常开机后表示该通道输出信号电平超出预设的阀值；
4.后面板说明
C-MARK DRD28A 后面板示意图如下
1— 电源插座 100-240V AC 50/60Hz
2— 电源开关 ON/OFF
ON 表示电源接通；OFF 表示电源切断；
3— RS232
DB9 母头，可通过 RS232 协议与计算机或其它设备通讯互联；
4— RS485
DB9 母头，可通过 RS485 协议与其它设备实现通讯互联；
5— 外部控制口
DB25母头，通过GPIO信号来实现对处理器内部的控制；
6— 输入口 1,2,3,4：
每个输入口包含两个通道，向 C-MARK DRD28A 音频处理器输入音频信号；
7— 输出口 1,2,3,4：
每个输出口包含两个通道，将 C-MARK DRD28A 处理后的音频信号输出到对应的设备；
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5.应用领域
因为 C-MARK DRD28A 设备能够为用户提供高品质的音频信号，所以它的应用范围也非常广泛，能够适
用于目前大部分的专业领域和社会应用场所。
专业领域：
■广播电视 ■现场音乐会
■录音室 ■专业演出场所
*体育场馆
社会领域
■车站 ■地铁 ■机场
■会议中心 ■游乐场所 ■主题公园
■智能大厦
第二章 技术规格
1.模拟音频信号输入规格
l 模拟输入转换为 24-bit ,48khz 的数字信号
l 频率响应: +/-0.2dB，20Hz~20kHz
l 最大增益：+66dB
l 幻象电源：+48V DC（10mA/输出）
l 动态范围: 103dBA，101dB
l 最大输入电平: +30dBu,差动平衡
l 输入阻抗: 6.3kOhms
2.模拟音频信号输出规格
l 24-bit ,48khz 数字信号转换为模拟信号输出；
l 频率响应:+/-0.2dB，20Hz~20kHz；
l THD+ N : <0.05% @4dbu 1KHz；
l 动态范围 : 103dBA，101dB；
l 最大输出电平: +24dBu,差动平衡；
l 输出阻抗: 100 欧姆，可推动最小 600 欧姆的负载；
3.接口规格
l 1 个 RS232 接口(9 孔母头)
接口示意图如右
引脚定义：
1,4,6,7,8,9： NC，未定义
2：RX Data 数据接收
3：TX Data 数据发送
5：接地
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