Polycom C16 User Manual

Design Guidefor the Polycom SoundStructureC16, C12, C8, and SR123725-33186-001 Revision: B

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR128

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 20Since there is only one large input range on SoundStructure devices, it is ea

Customizing SoundStructure Designs5 - 21button which is labeled Phan.Ungated TypeThe ungated type user control refers to which signal path to use for

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 22input basis.As described in Chapter 2, there are four different types of unga

Customizing SoundStructure Designs5 - 23where a program audio source can be processed with parametric equalization, automatic gain control, dynamics

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 24Delay TypeWhen the Sound Reinforcement ungated type is selected, there are tw

Customizing SoundStructure Designs5 - 25following figure. The low delay type corresponds to a processing path that completely bypasses the processing

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 26sound reinforcement paths. Delay CompensationThe delay compensation control a

Customizing SoundStructure Designs5 - 27Bypass ungated signal type is selected as shown in the following figure. TrimThe trim command is used with st

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 28gain of 64 dB will be added in the digital domain.EqualizationThe equalizatio

Customizing SoundStructure Designs5 - 29enabled.To enable a filter, click the button next to the filter, and then adjust the param-eters for the filt

1 - 11IntroductionThe Polycom SoundStructure™ products are professional, rack-mountable audio processing devices that set a new standard for audio per

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 30• Notch filter• Allpass filterParametric filters emphasize or de-emphasize th

Customizing SoundStructure Designs5 - 31figure.There is a safe mode attenuation that defines the amount of attenuation that can be applied to the sig

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 32selecting the Snd Reinforcement option of the gated/automixed as shown in the

Customizing SoundStructure Designs5 - 33group.References can be selected from any output signal or from any submix signal. A reference can be either

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 34dynamics processing, fader, delay, and mute. The acoustic echo canceller is a

Customizing SoundStructure Designs5 - 35nals so that the average signal level is close to the SoundStructure nominal signal level of 0 dBu. The AGC p

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 36input signals.SoundStructure devices include the following styles of look-ahe

Customizing SoundStructure Designs5 - 37Compressors And LimitersThe peak limiter monitors the peak signal magnitude and compares it to a threshold.

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 38Decreasing the attack time will allow the compressor/limiter to work more agg

Customizing SoundStructure Designs5 - 39input signal level and the gate threshold. For example, if the gate ratio is 10:1 and the input signal level

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR121 - 2• Ethernet port for easy configuration and device managementSoundStructure devi

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 40ing the Remove Channels button.There are two styles of automixer groups – gat

Customizing SoundStructure Designs5 - 41Camera Activity TimeCamera Activity Time specifies how long the microphone must be considered active before a

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 42have to be eligible to be considered active. Higher settings will make the ch

Customizing SoundStructure Designs5 - 43Gain Sharing Automixer ParametersSlopeThe Slope parameter determines the selectivity of how the gain is adjus

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 44in the digital domain. The fader control is shown in the following figure.A m

Customizing SoundStructure Designs5 - 45Signal GeneratorEach SoundStructure device can have a single signal generator defined can generate white nois

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 46Output SignalsThis section describes the user interface for configuring outpu

Customizing SoundStructure Designs5 - 47DynamicsThe output dynamics processing available on the outputs is the same as the input dynamics processing

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 48Output EQ Type parameter as shown in the following figure.The center frequenc

Customizing SoundStructure Designs5 - 49following table.These band edges are exactly between the center frequencies. At the band edges, the gain of t

Introduction1 - 3• Chapter 9 provides example applications with SoundStructure products including stereo audio conferencing applications, room combin

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 50Submix SignalsThis section describes the processing that is available for eac

Customizing SoundStructure Designs5 - 51• High Pass,• Low Shelf,• High Shelf, and• 10 parametric equalizersas shown in the following figure. To enabl

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 52Allpass filters do not modify the gain of the signal, but change the phase. F

Customizing SoundStructure Designs5 - 532. When a mono input signal is mapped to a stereo output signal with a gain of 0 dB, the mono input is mapped

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 54The collapsed view simplifies the configuration and setup of the system as th

Customizing SoundStructure Designs5 - 55and mute status may be adjusted on the matrix page or on the channels page.To edit a crosspoint, double left

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 56adjustment directly.MuteThe matrix crosspoint may be muted by clicking the Mu

Customizing SoundStructure Designs5 - 57cessing should be selected.To select the conferencing version of the input processing, select the Gated and C

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 58selected.To select the ungated/recording version of the crosspoint, select th

Customizing SoundStructure Designs5 - 59shown in the following figure.BalanceThe balance control allows the designer to adjust how a stereo input sig

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR121 - 4

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 60path on the SR-series), light blue indicates the sound reinforcement path, an

Customizing SoundStructure Designs5 - 61described in this section.Input GainThe telephone input gain has a range from -20 to +20 dB for adjusting the

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 62analog input gain adjustment on the telephone input virtual channel. The inpu

Customizing SoundStructure Designs5 - 63meter and the text box next to the AGC meter.The range of the AGC can be adjusted by expanding the AGC contro

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 64figured to have different equalization.To enable a filter, click the check bo

Customizing SoundStructure Designs5 - 65FaderThe fader control enables the user to add gain or attenuate the telephone signal from +20 dB to -100 dB

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 66The telephony channel controls are shown in the following figure.Phone Connec

Customizing SoundStructure Designs5 - 67Ring ToneRing tone enabled will cause the SoundStructure device to play ring tones into the local room when t

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 68Line Voltage and Loop CurrentThe line voltage and loop current are active whe

6 - 16Connecting Over Conference Link2This chapter describes how the Conference Link2 interface can be used to easily interface with other Polycom equ

2 - 12SoundStructure Product FamilyThere are two product lines in the SoundStructure product family - the SoundStructure C-series designed for audio c

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 2The rear-panel of the SoundStructure product with the Conference Link2 con-nec

Connecting Over Conference Link26 - 3The Conference Link2 interconnect allows for the transmission and reception of multiple digital audio signals be

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 4Input Channels From The Polycom HDXOnce the Polycom HDX video system is select

Connecting Over Conference Link26 - 5The input channels from the Polycom HDX are described in the following table.HDX Signal to SoundStructure Descri

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 6Processing On The Signals The Polycom HDX Sends To SoundStructureEach of the s

Connecting Over Conference Link26 - 7Output Channels To The Polycom HDXSoundStructure Studio creates several output virtual channels that are sent to

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 8The output processing on SoundStructure that is available for these output cha

Connecting Over Conference Link26 - 9channel, the SoundStructure “Program Audio” signal is routed to the “HDX Line Mix Out” channel, and the SoundStr

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 10or set mute “Mics” 0depending on whether the HDX system is being muted or unm

Connecting Over Conference Link26 - 11There is tremendous design flexibility by mapping the HDX Mute command to affect the “Mics” virtual channel or

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 2the following figure for a SoundStructure device that has N inputs and N output

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 12It is also possible to limit the minimum and maximum user gain settings via S

Connecting Over Conference Link26 - 13As shown in the following figure, the three microphone elements are labeled as A, B, and C within SoundStructur

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 14The following table shows the number of analog inputs that are available base

Connecting Over Conference Link26 - 15device. If the version of firmware on the microphones is older than the version of firmware included with the S

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 16Because microphone arrays may be shipped with a firmware version that may be

Connecting Over Conference Link26 - 17The first step of the design process is to select the input signals as shown in the following figure. Notice th

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 18In the third step, the equipment is selected. In this case a C12 is required

Connecting Over Conference Link26 - 19Assigning Digital Microphone Array Channels To Physical InputsWhen HDX digital microphone arrays are used withi

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 20In this example, up to six analog inputs can be used (three analog inputs are

Connecting Over Conference Link26 - 21Digital Microphone Array NumberingExamples of the microphone connections and their numbering within Sound-Struc

SoundStructure Product Family2 - 3echo cancellation while the SR-series products do not include acoustic echo cancellation. The processing capabiliti

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 22The orientation of the microphone does not affect the sequential numbering as

Connecting Over Conference Link26 - 23Installation OptionsThere are several installation options available depending on whether tabletop or ceiling m

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 24The digital tabletop microphone arrays are connected via Walta terminated cab

Connecting Over Conference Link26 - 25PIN 2: TXDPIN 3: RXDPIN 5: GROUNDPIN 7: CTSPIN 8: RTSLANC-LINK2OBAM IRRS-232IN OUT12VPIN 2: TXDPIN 3: RXDPIN 5:

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 26A summary of the cables is shown in the following table. The pin outs for the

Connecting Over Conference Link26 - 27The digital microphones should be connected to the right rear CLink2 port and the HDX video codec should be con

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126 - 28

7 - 17Installing SoundStructure DevicesThis chapter describes how to take the SoundStructure designs created in Chapters 4 and 5 and upload and confir

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 2Wiring The DevicesOne of the most important steps when working with SoundStruc

Installing SoundStructure Devices7 - 3input 9 and the VSX8000 input is connected to input 10. On the outputs, the amplifier output is connected to ph

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 4• It is easier to work with the system because all the input signals feed into

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 4There is a wiring report that can be created by clicking the Save Report butto

Installing SoundStructure Devices7 - 5Uploading A Configuration FileConfiguration files are uploaded to a SoundStructure device or downloaded from a

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 6dio.If the Serial control is checked, the system will also search for devices

Installing SoundStructure Devices7 - 7If the device is running a configuration file that had previously been uploaded, the output channels will be mu

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 8Once connected to a device as described in the previous sections, click on the

Installing SoundStructure Devices7 - 9Select the file by double clicking on the desired file name. Once the file has been selected, the firmware upda

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 10Configuring The Signal GainsOnce the SoundStructure device settings are synch

Installing SoundStructure Devices7 - 11sense, the meter segment label represents the minimum signal level required to light the meter segment. The cl

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 12For example, a common tabletop microphone has a sensitivity of -27.5 dBV/Pa.

Installing SoundStructure Devices7 - 13The following figure shows different room gain measurements that may be found in a typical room. Room gain is

SoundStructure Product Family2 - 5SoundStructure C-series ProductsThe SoundStructure C16, C12, and C8 devices are designed for audio conferencing app

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 14When two mono AEC references are used, or a stereo virtual channel is used as

Installing SoundStructure Devices7 - 15Phone InChannelPhone OutChannelFaderToneGeneratorDelayA/DConverterAnalogGainD/AConverterAnalogGainInput from P

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 16Output Signal LevelsOutput signals from the SoundStructure device are connect

Installing SoundStructure Devices7 - 17Setting Amplifier LevelsIt is important to set the proper level of the audio amplifier in the room. This can b

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 182. Set the analog output gain on the amplifier output channel to be either +4

Installing SoundStructure Devices7 - 195. Set the output fader from the SoundStructure device to 0 as shown in the next figure and unmute the signal

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 20be performed by adjusting the level of the fader on the “Amplifier” channel w

Installing SoundStructure Devices7 - 21Preset OperationSoundStructure devices store presets in non-volatile memory to ensure the preset settings are

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 22Preset NamesWhen presets are stored, the preset name may be customized to any

Installing SoundStructure Devices7 - 23The preset page shows the presets and also the preset contents to make it pos-sible to determine the settings

Polycom Inc.4750 Willow RoadPleasanton, CA 94588-2708USANo part of this document may be reproduced or transmitted in any form or by any means, electro

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 6Each SoundStructure C-series device may be used with traditional analog microph

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 24Saving a preset to the SoundStructure system will cause the preset to be writ

Installing SoundStructure Devices7 - 25• Creating new blank partial presetsPartial presets consist of a sequence of commands that will be executed in

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 26New partial presets may be created by selecting ‘New Partial’ as shown in the

Installing SoundStructure Devices7 - 27Once the empty partial preset has been created, the next step is to add com-mands to the partial preset by cli

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 28Once entries have been moved, select “Save Selected” to save the new execu-ti

Installing SoundStructure Devices7 - 29Removing PresetsPresets may be removed from the system by left clicking on the preset and then clicking Remove

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR127 - 30

8 - 18Network ManagementThis chapter describes the network and control aspects of SoundStructure sys-tems including managing the device over IP and co

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR128 - 2Dynamic IP AddressesBy default, the SoundStructure device accepts an IP addres

Network Management8 - 3By default the system name is set to “SoundStructure System” as shown in the next figure.The system name is used to easily ide

SoundStructure Product Family2 - 7C-Series Input ProcessingThe input processing on the SoundStructure C-series devices is designed to make it easy to

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR128 - 4To configure the device to have a static IP address, use the eth_settings com-

Network Management8 - 5To set the address to a static IP address, follow this example:set eth_settings 1 “mode='static',addr='172.22.2

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR128 - 6The command responses are received back and include the mute status for all vi

Network Management8 - 7Depending on the network router configurations in the network, SoundStruc-ture device discovery may not work across different

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR128 - 8The RS-232 port may be used for control sessions or for configuration with Sou

Network Management8 - 9API commands correspond to the commands that were sent to the system and how they were transmitted, IP or RS-232. API command

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR128 - 10

9 - 19Advanced ApplicationsThis chapter describes several applications of the SoundStructure products and the steps required to create these applicati

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 2Before proceeding with the design, install SoundStructure Studio software from

Advanced Applications9 - 3Step 2 - Select OutputsFor the second step, select a mono amplifier as the output source. The VSX8000 output is automatical

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 8analog input signal is digitized and available for processing. The digital sign

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 4Step 4 - Work Offline Or OnlineIn this step offline operation is selected to c

Advanced Applications9 - 5nel is set to 0dB, in other words, no gain is applied. It is also assumed that the Amplifier can accept the nominal 0dBu le

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 6Matrix SettingsThe matrix page shows how the input signals are mapped to the o

Advanced Applications9 - 7output 2. If this wiring scheme does not match how the system has been wired, the channels may be moved around on the wirin

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 8Volume ControlVolume control in the room can be accomplished by adjusting the

Advanced Applications9 - 94 digital Array Microphones And A SoundStation VTX1000This example creates a typical audio conferencing system with four di

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 10The block diagram of this system is shown in the following figure. The From V

Advanced Applications9 - 11SoundStructure Studio StepsThe steps to create this project are shown in the following figures. The names for the channels

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 12Step 2 - Select OutputsSelect a mono amplifier as the output source. The VTX1

Advanced Applications9 - 13Step 4 - Work Offline Or OnlineIn this step offline operation is selected to create a file for later upload into a SoundSt

SoundStructure Product Family2 - 9 These three different versions of the input signal mean that, at the same time, an output signal to the loudspeake

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 14The microphones “Table Mic 1 A” through “Table Mic 4 C” are routed to the “VT

Advanced Applications9 - 15The matrix may be collapsed by clicking the up arrows next to the “Mics” group. Because all the microphones are used in th

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 16By default the AEC reference has been set to the mono virtual channel “Ampli-

Advanced Applications9 - 17On the VTX1000 out channel, change the gain from -5 to -10 as shown in the following figure. This change is to ensure the

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 18After this output gain change, and any other changes that are made to the fil

Advanced Applications9 - 19tion. The digital microphone arrays require the processing of 12 analog inputs and are assigned to inputs 5 - 16 automatic

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 208 Microphones, Video, And Telephony ApplicationThis example creates a typical

Advanced Applications9 - 21SoundStructure Studio StepsThe steps to create this project are shown in the following figures. The names for the channels

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 22Step 3 - Select DevicesSelect the equipment required to create this design. B

Advanced Applications9 - 23The input virtual channels that include remote audio are the “Phone In”, “Pro-gram Audio”, and “VSX8000 In”. These channel

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 10automatic gain control on the sound reinforcement path from increasing the mic

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 24The matrix may be collapsed by clicking the up arrows next to the “Mics” grou

Advanced Applications9 - 25By default the AEC reference has been set to the mono virtual channel “Ampli-fier” because this audio includes all the rem

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 26Wiring InformationThe system should be wired according to the layout on the w

Advanced Applications9 - 27set mute “Mics” 1 will mute all the microphones in the system andset mute “Mics” 0 will unmute the microphones in the syst

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 28Two PSTN Line Positional “Receive” Audio ConferencingThis example creates a p

Advanced Applications9 - 29The block diagram of this system is shown in the next figure. The channel names are labeled with the virtual channel names

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 30Step 1 - Select InputsSelect 8 table microphones, a stereo program audio sour

Advanced Applications9 - 31Step 3 - Select EquipmentSelect the equipment required to create this design. By default the SoundStruc-ture C12 with a du

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 32By default the two telephone lines are routed to both “Amplifier 1” and “Ampl

Advanced Applications9 - 33amplifier outputs can be adjusted with the balance control as shown in the fol-lowing figure. The program audio is balance

SoundStructure Product Family2 - 11processing on an input signal. This version of the signal has no acoustic echo cancellation processing and will co

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 34The matrix may be collapsed by clicking the arrows next to the “Mics” group r

Advanced Applications9 - 35By default the two AEC references have been set to the two mono amplifiers “Amplifier 1” and “Amplifier 2” and is then sho

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 36Wiring InformationThe system should be wired according to the information fou

Advanced Applications9 - 37will unmute the microphones in the system.Volume ControlVolume control in the room can be accomplished by adjusting the fa

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 38No change to the AEC reference would be required as the AEC reference uses bo

Advanced Applications9 - 398 Microphones And Stereo Video ConferencingThis example creates a stereo video conferencing system with eight table microp

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 40Once the design is completed, the matrix looks very similar to the mono con-f

Advanced Applications9 - 41The remote participants at site 2 will see the site 1 talker at microphone 1 on the right side of their screen when the re

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 42The relative position for microphone 1 can be set at the matrix crosspoint to

Advanced Applications9 - 43The other microphones also have relative positions as shown in the following figure.Site 1RoomLeftRoomRightCameraADisplayL

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 12Recording/Ungated - Sound ReinforcementFinally, the sound reinforcement record

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 44By estimating their pan position, the resulting matrix will look like the nex

Advanced Applications9 - 45By default the AEC reference has been set to the stereo virtual channel “Ampli-fier” and is then shown to be in stereo mod

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 46Wiring InformationThe system should be wired according to the information fou

Advanced Applications9 - 478 Mics With The Polycom HDX Video Conferencing SystemThis example shows how to use 8 analog microphones with a SoundStruct

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 48Step 1 - Select InputsSelect eight table microphones and a Polycom HDX video

Advanced Applications9 - 49Step 3 - Select DevicesSelect the equipment required to create this design. By default the SoundStruc-ture C8 is selected.

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 50The input virtual channels include microphones that are included in the vir-t

Advanced Applications9 - 51By default the AEC reference has been set to the mono virtual channel “Ampli-fier” because this audio includes all the rem

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 52Wiring InformationThe system should be wired according to the layout on the w

Advanced Applications9 - 53When connected to the Polycom HDX system, the microphones on the Sound-Structure by muting the microphones on the Polycom

SoundStructure Product Family2 - 13The following figure highlights how to interpret the matrix crosspoints in the matrix.C-Series Output processingAs

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 548 Mics With Reinforcement Of Wireless And Lectern MicsThis example shows how

Advanced Applications9 - 55The block diagram of this system is shown in the following figure. The channel names are labeled with the virtual channel

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 56Matrix SettingsThe matrix that is created by SoundStructure Studio is shown i

Advanced Applications9 - 57All microphones are sent to the remote telephony participant as shown with the routing of the conferencing version of the

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 58Channels SettingsThe next step is to enable the feedback processing on the wi

Advanced Applications9 - 59To ensure the wireless microphone will be the active microphone if the pre-senter with the wireless microphone is picked u

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 60The first step to creating the wireless microphone’s reference is to build th

Advanced Applications9 - 61The same approach can be taken with the lectern microphone, creating a submix called “LecternRef” that includes the reinfo

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 62Finally, the reference for the table microphones can be set to include both t

Advanced Applications9 - 63The “RemoteAudio” submix will also be routed to the different amplifier zones and remote telephone participants.

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 14C-Series Submix ProcessingSubmixes are outputs from the matrix that can be rou

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 64Wiring InformationThe system should be wired according to the information fou

Advanced Applications9 - 65The reinforcement of the wireless microphone may be disabled by muting the reinforced crosspoints as shown next.set matrix

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 6616 Mics With 6-Zone Sound ReinforcementThis example shows how to use the soun

Advanced Applications9 - 67SoundStructure Studio StepsStep 1 - Select InputsThe system is designed with 16 table microphones, one lectern mic, one wi

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 68Step 2 - Select OutputsSix mono audio amplifiers are added to the system in t

Advanced Applications9 - 69Step 4 - Work Offline Or OnlineAs there are many matrix settings to change, we’ll work off line and adjust the crosspoints

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 70Matrix SettingsThe default matrix with the desired inputs and outputs is show

Advanced Applications9 - 71The next step is to create the microphone zone groups that will simplify setting up the reinforcement levels. The designed

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 72zones. For example, the zone 1 microphones are mapped to zones 2, 3, 4, 5, an

Advanced Applications9 - 73The next step is to map the stereo program audio and video codec audio to the appropriate left and right loudspeakers in t

SoundStructure Product Family2 - 15As shown in the following figure, each submix signal from the matrix can be processed with dynamics processing, pa

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 74Channels SettingsOnce the matrix has been configured, the next step is to ena

Advanced Applications9 - 75ences, and Zone 3 and Zone 4 microphones will have Zone 3 and Zone 4 amplifiers selected as shown in the next figure. This

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 76The first C12 is configured to be bus id 1 and the second is configured to be

Advanced Applications9 - 77set mute “Mics” 0The in-room volume for the remote audio may be increased with the fader command on the phone or video cod

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 78Room combining application with two roomsThis example shows how to use the So

Advanced Applications9 - 79The room configuration will operate as follows.Combined ModeIn the combined mode, the system is configured as follows:• Al

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 80• Both telephone lines are routed to the loudspeakers• Both program audio sou

Advanced Applications9 - 81SoundStructure Studio StepsStep 1 - Select InputsThe system should be designed in the combined mode with two HDX table mic

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 82Step 2 - Select OutputsTwo mono amplifiers will be selected in this step. The

Advanced Applications9 - 83Step 4 - Work Offline Or OnlineAs there are many matrix settings to change, we’ll work off line and adjust the crosspoints

11 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–12 SoundStructure Product Family . . . . . . .

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 16In order for the local acoustic echo canceller to cancel the acoustic echo of

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 84Combined Room SettingsThe default matrix with the desired inputs and outputs

Advanced Applications9 - 85The updated matrix is shown in the following figure.In this matrix, the submix “Amplifier” is used to route the remote aud

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 86On the channels page, set the AEC reference for all the Room 1 microphones as

Advanced Applications9 - 87Split Room SettingsIn the split room configuration, the matrix settings must be adjusted to route the audio to meet the or

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 88The automixer settings for the Room 1 mics is shown in the following figure a

Advanced Applications9 - 89The automixer settings for the Room 2 mics is shown in the following figure after setting the Automixer Group to 2 and add

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 90Finally, confirm that there is a power on preset - in this example it should

Advanced Applications9 - 91In this example, a single C8 device was used to implement the design. This device is wired as shown in the following figur

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR129 - 92to increment the gain in the combined Amplifier by 1 dB. In the split mode, t

10 - 110TroubleShootingThis chapter presents a series of situations and troubleshooting steps to resolve the situation. Troubleshooting is most effect

SoundStructure Product Family2 - 17reinforcement, and broadcasting. The following figure shows an example of using the SoundStructure SR12 to provide

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1210 - 2Is the amplifier turned on? Can other sources of audio be heard in the local

TroubleShooting10 - 3Also ensure the sound reinforcement signal path is selected at the matrix cros-spoint. There should be a light blue background o

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1210 - 4Echo TroubleshootingMany echo problems can be traced to:1. Check loop-back ec

TroubleShooting10 - 5Mute all the microphones except for one and on the unmuted microphone, check the value of the AEC reference. In the following fi

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1210 - 6reduce room gain by lowering the audio amplifier level and increasing the inp

TroubleShooting10 - 7Because the AEC reference is available after the fader as presented in Chapter 3 and shown in the following figure, the result i

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1210 - 8the following figure. The result of this is that the proper signal levels are

TroubleShooting10 - 9API TroubleshootingWhen using TeraTerm 3.1 and connecting over Telnet, why do I have to select CR-LF termination for commands se

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1210 - 10will cause this error message. Fix this syntax by putting double quotes arou

TroubleShooting10 - 11set mute “Mics” 1and set mute “Mics” 0to mute and unmute, respectively the microphones. This command should generate a series o

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 18particular SoundStructure C-series device, either the next largest C-series de

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1210 - 12RS-232 TroubleshootingI Can’t Connect Over RS-232 To The System, How Do I Co

TroubleShooting10 - 13What Is Flow Control And How Does It Work?Hardware flow control on the SoundStructure device requires two additional handshakin

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1210 - 14The connection status can also be viewed within the System Information page

TroubleShooting10 - 15Use SoundStructure Studio and from the Channels Page select the phone Set-tings... button to open a telephone keypad. Click the

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1210 - 16SoundStructure Studio Can’t Find My SoundStructure Device Over EthernetDepen

TroubleShooting10 - 17OBAM TroubleshootingThere are status LEDs associated with both the OBAM input and output con-nections. These LEDs are positione

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1210 - 18Troubleshooting The IR InterfaceIf you are not receiving command acknowledge

TroubleShooting10 - 19

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1210 - 20

11 - 111SpecificationsTechnical SpecificationsDimensions• 19" (483 mm) W x 13.5" (343 mm) L x 1.75" (45 mm) H (one rack unit)Weight• 12

SoundStructure Product Family2 - 19SR-Series Input ProcessingThe input processing on the SoundStructure SR-series devices is designed to make it easy

11 - 2Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12Thermal• Thermal Dissipation (Btu/hr): 266 Btu/hr (C16), 230 Btu/hr (C12), 215

Specifications11 - 3• THD+N: < 0.005%, -20 dB FS input signal• Common mode rejection ratio: <-61 dB, 20-20,000 Hz, no weighting• Cross talk: &l

11 - 4Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12Pin Out SummaryPSTN CableTo build a custom telephone cable, use 26AWG twisted-

Specifications11 - 5Conference Link2To build a custom Conference Link2 cable, use shielded CAT5e, or better, and terminate both end connectors, P1 an

11 - 6Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12OBAM LinkThe OBAM cable is a standard 1394b BETA style cable. The maximum leng

Specifications11 - 7IR ReceiverThe IR receiver port on the rear-panel of a SoundStructure device is shown in the next figure.The IR receiver port acc

11 - 8Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12Logic InterfaceSoundStructure Control SystemPin Signal Pin Signal1- 1 -2TX 2 R

Specifications11 - 9Audio ConnectionsSoundStructure devices provide balanced audio input and output connections that are terminated with 3.5 mm termi

11 - 10Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12SoundStructure device's audio input and output to other balanced or unba

12 - 112Using SoundStructure Studio ControlsThe SoundStructure Studio software environment includes various user inter-face controls for adjusting the

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 20Each analog input signal has an analog gain stage that is used to adjust the g

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1212 - 2Adjusting Matrix CrosspointsIndividual crosspoints can be adjusted by double

Using SoundStructure Studio Controls12 - 3

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR1212 - 4

A - 1ACommand Protocol Reference GuideIntroductionThis chapter describes the SoundStructure™ command protocol used to control and configure the SoundS

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 2time over the ethernet interface than the RS-232 interface and signal meters ar

Command Protocol Reference GuideA - 3EthernetEach SoundStructure device has a rear-panel Ethernet interface for connecting to the local area network

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 4used to connect the SoundStructure devices to more than one network. Multiple n

Command Protocol Reference GuideA - 5The motivation for using virtual channels is both to allow the control system programming to start before the ph

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 6Virtual Channel TypesVirtual channels are operated on by the command set which

Command Protocol Reference GuideA - 7As an example of a virtual channel group, consider in the following figure the creation of the virtual channel g

SoundStructure Product Family2 - 21The automixer processing is only applied to the noise cancelled and sound reinforcement signal paths to ensure tha

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 8Controlling SoundStructure ParametersThe SoundStructure command and control fun

Command Protocol Reference GuideA - 9voidVoid commands take no argument, and must be write-only. For example, the sys_reboot parameter is a write-onl

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 10Command FormatReferring to the command hierarchy below, each sub-category of c

Command Protocol Reference GuideA - 11Command LengthAll commands must be less than or equal to 2048 bytes in length, including the terminator.Control

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 12Floating-Point ArgumentsFloating-point arguments represent a floating-point va

Command Protocol Reference GuideA - 13Virtual Channel Definition CommandsVirtual channel definition commands are a type of control command that provi

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 14<pctype> The <pctype> argument defines the physical channel type o

Command Protocol Reference GuideA - 15<num>One or more <num> arguments are required to define the global channel index (indices) of the p

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 16vcdef Acknowledgements When a virtual channel definition command with the vcde

Command Protocol Reference GuideA - 17<pctype> The <pctype> argument defines the physical channel type of the physical channels in the vi

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 22microphone audio to paging zones that are not acoustically coupled to the micr

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 18The <label> argument is a user-defined text argument that specifies the

Command Protocol Reference GuideA - 19vcgdef <label> [<vcmember> [<vcmember> ... ]]<term>Each of the command arguments is des

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 20vcgrename ActionThe vcgrename action is a virtual channel group definition com

Command Protocol Reference GuideA - 21respond with an error message. If the virtual channel is already a member of the virtual channel group, the So

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 22Each of the command arguments is described below.<label>The <label>

Command Protocol Reference GuideA - 23Parameter Command SyntaxAll parameter commands have the following syntax.<action> <param> [<limi

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 24Some parameters support user-definable minimum and maximum values. For these c

Command Protocol Reference GuideA - 25Thus, read-write commands support the get and set actions and support the inc, dec, or tog actions depending on

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 26Float parameter commands support the get, set, inc and dec actions according t

Command Protocol Reference GuideA - 27Acknowledgements are generated when either a parameter command is issued or a parameter changes value for some

SoundStructure Product Family2 - 23For additional flexibility in audio applications, there are four different versions of the recording/ungated signa

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 28Command ListThe complete system parameter command reference is found in the fi

Command Protocol Reference GuideA - 29DescriptionThis parameter sets the fader level (in dB) in the digital domain.Interpretation of the ArgumentsThe

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 30set fader "Amplifier" 10val fader "Amplifier" 10.0set fade

Command Protocol Reference GuideA - 31DescriptionThis parameter sets the fader level (in dB) in the digital domain.Examplesline_out_gain Line Output

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 32DescriptionThis parameter sets the gain (in dB) of the line output.Examplesmic

Command Protocol Reference GuideA - 33mute Digital MuteDescriptionThis parameter sets the mute status of the virtual channel. A value of 0 indicates

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 34phantom 48 V Phantom PowerDescriptionEnables or disable phantom power on mic i

Command Protocol Reference GuideA - 35trim Gain Trim For Virtual ChannelsDescriptionThis parameter applies gain (in the analog domain) to the individ

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 36Matrix Parametersmatrix_balance Matrix Crosspoint BalanceDescriptionThe matrix

Command Protocol Reference GuideA - 37matrix_gain Matrix Crosspoint GainDescriptionThis parameter sets the gain (in dB) for the specified crosspoint

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 24Recording/Ungated - Noise CancelledThe noise cancelled recording input include

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 38DescriptionThis parameter selects whether the gated (1) or ungated (0) version

Command Protocol Reference GuideA - 39DescriptionThis parameter selects the gating style for crosspoints with conferencing inputs. TODO: describe pro

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 40matrix_mute Matrix Crosspoint MuteDescriptionMutes or unmutes the specified cr

Command Protocol Reference GuideA - 41DescriptionThe matrix_pan parameter is available at crosspoints where mono virtual channels are mixed to stereo

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 42Command Input channel Output channelphone_auto_answer_en✔phone_connect✔phone_d

Command Protocol Reference GuideA - 43phone_auto_answer_en Enable Auto-Answer For Telephony InterfaceDescriptionThis parameter enables (1) or disable

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 44phone_dial Dial The Telephony InterfaceDescriptionThis command dials the speci

Command Protocol Reference GuideA - 45phone_dial_tone_gain Dial Tone GainDescriptionThis parameter controls the gain that is applied to the incoming

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 46DescriptionThis parameter sets the gain (in dB) applied to DTMF tones generate

Command Protocol Reference GuideA - 47DescriptionThis parameter enables or disables exit tone generation for the telephony interface. If exit tones a

SoundStructure Product Family2 - 25represented with different background colors at the matrix crosspoint. The SoundStructure Studio software allows t

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 48DescriptionThis parameter sets the delay (in milliseconds) for the phone_flash

Command Protocol Reference GuideA - 49DescriptionThis parameter indicates the ringing state for the telephony interface. While the telephony interfac

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 50DescriptionThis parameter sets the gain (in dB) applied to tones generated to

Command Protocol Reference GuideA - 51Values argentina : Argentinaaustralia : Australiaaustria : Austriabahrain : Bahrainbelgium : Belgiumbrazil : Br

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 52Values italy : Italyjapan : Japanjordan : Jordankazakhstan : Kazakhstankuwait

Command Protocol Reference GuideA - 53DescriptionThis parameter configures the PSTN interface for operation in a specific country.pstn_flash_delay_ov

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 54pstn_line_voltage PSTN Line VoltageDescriptionThis parameter indicates the lin

Command Protocol Reference GuideA - 55DescriptionThis parameter indicates the loop current (in milliamps) of the PSTN interface. The value is only va

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 56eq_en Enable All Equalizer ProcessingDescriptionThis parameter enables (1) or

Command Protocol Reference GuideA - 57geq_compensate Enable Gain Compensation For Graphic EqualizerDescriptionThis parameter enables (1) or disables

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122Step 3 - Device Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 26SR-Series Submix ProcessingThe submix processing for the SR-series of products

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 58DescriptionSet the gain of the specified band in the graphic equalizer. The in

Command Protocol Reference GuideA - 59DescriptionThis parameter enables (1) or disables (0) the high shelving filter for the specified virtual channe

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 60high_shelf_gain Gain Of High Shelving FilterDescriptionThis parameter sets the

Command Protocol Reference GuideA - 61horn_en Enable Horn EqualizerDescriptionThis parameter enables (1) or disables (0) the constant directivity hor

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 62hpf_en Enable High-Pass FilterDescriptionThis parameter enables (1) or disable

Command Protocol Reference GuideA - 63hpf_order Order of High-Pass FilterDescriptionThis parameter sets the order of the high-pass filter. Linkwitz-R

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 64low_shelf_en Enable Low Shelving FilterDescriptionThis parameter enables (1) o

Command Protocol Reference GuideA - 65low_shelf_gain Gain Of Low Shelving FilterDescriptionThis parameter sets the gain (in dB) of the low shelving f

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 66lpf_en Enable Low-Pass FilterDescriptionThis parameter enables (1) or disables

Command Protocol Reference GuideA - 67lpf_order Order Of Low-Pass FilterDescriptionThis parameter sets the order of the low-pass filter. Linkwitz-Ril

SoundStructure Product Family2 - 27Telephony ProcessingBoth the C-series and SR-series SoundStructure devices support optional plug-in cards. Current

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 68peq_band_en Enable Parametric Equalizer BandDescriptionThis parameter enables

Command Protocol Reference GuideA - 69DescriptionThis parameter sets the bandwidth (in octaves) of the specified parametric equalizer band. In the ca

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 70DescriptionThis parameter sets the gain (in dB) of the specified parametric eq

Command Protocol Reference GuideA - 71Dynamics Processing ParametersDescriptionDynamics processing is available on all physical channels except the s

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 72DescriptionThis parameter sets the amount of time (in milliseconds) it takes t

Command Protocol Reference GuideA - 73dp_gate_en Enable GateDescriptionThis parameter enables (1) or disables (0) the gate function of the dynamics p

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 74dp_gate_ratio Gate RatioDescriptionThis parameter sets the ratio of the target

Command Protocol Reference GuideA - 75DescriptionThis parameter sets the RMS level (in dBFS) of the input signal below which the gate engages. The le

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 76DescriptionThis parameter sets the amount of time (in milliseconds) it takes t

Command Protocol Reference GuideA - 77DescriptionThis parameter sets the ratio of the target gain applied by the expander versus the difference betwe

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 28The SoundStructure telephony cards have been designed to meet various regional

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 78dp_comp_attack Compressor Attack timeDescriptionThis parameter sets the amount

Command Protocol Reference GuideA - 79DescriptionThis parameter sets the amount of time (in milliseconds) it takes the compressor to ramp the gain up

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 80DescriptionThis parameter sets the ratio of the target gain applied by the com

Command Protocol Reference GuideA - 81DescriptionThis parameter sets the amount of time (in milliseconds) it takes the limiter to ramp the gain down

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 82dp_lim_en Enable LimiterDescriptionThis parameter enables (1) or disables (0)

Command Protocol Reference GuideA - 83DescriptionThis parameter sets the ratio of the target gain applied by the limiter versus the difference betwee

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 84DescriptionThis parameter enables (1) or disables (0) the peak limiter functio

Command Protocol Reference GuideA - 85DescriptionThis parameter enables (1) or disables (0) the acoustic echo cancellation (AEC) algorithm.aec_noise_

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 86The index is used to specify the left (1) or right (2) reference channels. If

Command Protocol Reference GuideA - 87DescriptionThis parameter sets the maximum gain (in dB) that can be applied by the AGC.agc_min_gain AGC Minimum

SoundStructure Product Family2 - 29progress detector that analyzes the telephony input signal and reports if any call progress tones are present (for

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 88DescriptionThis parameter sets the amount of delay applied to the audio signal

Command Protocol Reference GuideA - 89fb_filter_bandwidth Feedback Reduction filter BandwidthDescriptionThis parameter sets the bandwidth (in octaves

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 90fb_filter_reset Reset One Of The Feedback Reduction FiltersDescriptionSetting

Command Protocol Reference GuideA - 91fb_safe_mode_atten Safe Mode Attenuation For Feedback ReductionDescriptionThis parameter defines the maximum am

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 92DescriptionThis parameter selects the index of the audio source for the corres

Command Protocol Reference GuideA - 93DescriptionThis parameter selects the audio source for the corresponding cr_mic_in or sr_mic_in physical channe

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 94nc_level Noise Cancellation LevelDescriptionThis parameter sets the amount of

Command Protocol Reference GuideA - 95sig_gen_sweep_start Signal Generator Sweep Start FrequencyDescriptionWhen the signal generator’s sig_gen_type i

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 96sig_gen_sweep_stop Signal Generator Sweep Stop FrequencyDescriptionWhen the si

Command Protocol Reference GuideA - 97sig_gen_tone_freq Signal Generator Tone FrequencyDescriptionThis parameter sets the frequency (in Hz) of the si

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR122 - 30

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 98Input Path Parameterscr_ungated_type Select Processing For Ungated SignalDescr

Command Protocol Reference GuideA - 99sr_ungated_type Select Processing For Ungated SignalDescriptionThis parameter selects the version of signal to

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 100Automixer Parametersam_adapt_thresh Automixer Adaptive ThresholdDescriptionTh

Command Protocol Reference GuideA - 101am_chairman Automixer Chairman MicrophoneDescriptionWhen this parameter is set to 1, the microphone is conside

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 102am_decay_time Automixer Decay TimeDescriptionThis parameter defines how long

Command Protocol Reference GuideA - 103am_gain_sharing Enable Gain-Sharing Automixer ModeDescriptionThis parameter selects gain-sharing mode for the

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 104Examplesam_hold_time Automixer Hold TimeDescriptionThis parameter defines how

Command Protocol Reference GuideA - 105am_nom_limit NOM LimitDescriptionThis parameter sets the NOM limit for the microphone with respect to its auto

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 106am_priority Automixer Microphone PriorityDescriptionThis parameter sets the p

Command Protocol Reference GuideA - 107am_slope Gain Sharing Automixer SlopeDescriptionThis parameter defines how much attenuation (in dB) is applied

3 - 13SoundStructure Design ConceptsBefore creating designs for the SoundStructure devices, the concepts of physical channels, virtual channels, and v

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 108DescriptionThis parameter gets or sets the value of the analog gpio pin. Writ

Command Protocol Reference GuideA - 109DescriptionThis parameter gets or sets the minimum value of the analog gpio pin. This parameter along with ana

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 110DescriptionThis parameter gets or sets the value of the digital gpio array. W

Command Protocol Reference GuideA - 111set eth_settings 1 "mode='dhcp'"val eth_settings 1 "mode='dhcp',addr='

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 112DescriptionThis parameter selects the method for obtaining the IP address of

Command Protocol Reference GuideA - 113ir_key_held Key Held On IR RemoteDescriptionWhen queried, this parameter returns the keycode value of the last

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 114ser_flow RS-232 Flow ControlDescriptionThis parameter sets the type of flow c

Command Protocol Reference GuideA - 115dev_firmware_ver Firmware VersionDescriptionThis parameter returns the device’s firmware version.Examplesdev_n

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 116DescriptionThis parameter returns the status of the system. A value of ok ind

Command Protocol Reference GuideA - 117dev_type Device TypeDescriptionThis parameter returns the type of the device.dev_uptime System UptimeDescripti

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 2be used and take extra care to ensure that commands are referencing that exact

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 118DescriptionThis parameter returns the voltage (in Volts) of the ConferenceLin

Command Protocol Reference GuideA - 119DescriptionThis parameter returns the voltage (in Volts) of the +15 V power supply.sys_factory_reset Restore S

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12A - 120sys_reboot Reset The DeviceDescriptionSetting this parameter causes all linke

B - 1BDesigning Audio Conferencing SystemsReprinted from the BICSI AV Design Reference Manual, the following audio conferencing design material is aut

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 2The challenge in audio conferencing is that the loudspeaker audio is not only h

Designing Audio Conferencing SystemsB - 3Microphone Selection And PlacementThe type of microphones used and their location will have the largest impa

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 4Directional microphones are most often used in conferencing systems due to the

Designing Audio Conferencing SystemsB - 5audio signal. When this happens, a noticeable beeping or chipping sound that sounds modulated such as if it

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 6moving microphones closer to the talkers, moving noise sources away from the mi

Designing Audio Conferencing SystemsB - 7Tabletop MicrophonesIn many conferencing applications boundary tabletop microphones are used and mounted at

SoundStructure Design Concepts3 - 3The physical input channels and the physical output channels will be numbered from 1 to the maximum number of phys

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 8Wireless MicrophonesWireless microphones are also commonly used in conferencing

Designing Audio Conferencing SystemsB - 9installed. With the use of a microphone amplifier and powered loudspeaker, it is a simple matter to have t

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 10Noise CancellationThe ambient noise in the room caused by HVAC, projectors, co

Designing Audio Conferencing SystemsB - 11However, if ceiling microphones are swaying due to the air flow from nearby HVAC ducts, noise cancellation

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 12around. The following figure illustrates the block diagram of an AEC system an

Designing Audio Conferencing SystemsB - 13AEC ReferenceThe AEC reference provides the AEC with the information of what signals it should cancel from

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 14200 msec for larger rooms. As shown in the following figure, if the room is li

Designing Audio Conferencing SystemsB - 15may occur in the data as it is transmitted through the network. It is not uncommon for networks to require

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 16would be the ratio of 10 Log (B/C) which, due to the acoustic echo canceller,

Designing Audio Conferencing SystemsB - 17left side of the following figure), each local talkers' voice will be processed by the same noise redu

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 4The OBAM link is bidirectional - data flows in both an upstream and downstream

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 18If the microphones are muted in the signal chain before the acoustic echo canc

Designing Audio Conferencing SystemsB - 19The most common reason for acoustic echo is that the echo return loss of the room is not high enough to all

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 20While side-tone is desirable while talking on a handset, it is not desirable i

Designing Audio Conferencing SystemsB - 21AmplifiersThere are two broad classes of amplifiers - low impedance and constant voltage. The low impedanc

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 22the following figure, not only are listener 2 and listener 3 farther away from

Designing Audio Conferencing SystemsB - 23Another rule of thumb about loudspeaker positioning with listeners is to distribute the loudspeakers no gre

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 24following figure. As discussed in an earlier section, the microphones should b

Designing Audio Conferencing SystemsB - 25Loudspeakers - How Much Power Is RequiredOnce the locations of the loudspeakers have been determined, the n

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 26device, the reinforcement of the ceiling loudspeakers can be delayed slightly

Designing Audio Conferencing SystemsB - 27intelligibility. If they do, then the system is set correctly. The reinforced levels should never exceed co

SoundStructure Design Concepts3 - 5continue for additional devices. This connection strategy, shown in the following figures, simplifies the sequenti

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 28the reinforcement system - zones twice as far away will typically have 6 dB mo

Designing Audio Conferencing SystemsB - 29In a room that has sound-reinforcement with inappropriately high gain settings, there is no longer any such

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12B - 30

3Adjusting Crosspoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–54Matrix summary . . . . . . . . .

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 6Following the connections in the previous figure, as an example of this linking

SoundStructure Design Concepts3 - 7Device A's inputs and outputs become the first sixteen physical inputs and sixteen outputs on the system, dev

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 8finally device B becomes the third device in the link. The result is that the i

SoundStructure Design Concepts3 - 9The organization of the devices in this example would make it confusing to properly terminate inputs and outputs t

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 10Virtual ChannelsA virtual channel can be thought of as a layer that is wrapped

SoundStructure Design Concepts3 - 11example, mutes or changes volume) the SoundStructure devices through the virtual channel names, not the underlyin

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 12Using SoundStructure virtual channels is the only way to configure and control

SoundStructure Design Concepts3 - 13group “Mics” has been created, it is possible to configure and control all the microphones at the same time by op

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 14As an example of using physical channels, virtual channels, and virtual channe

SoundStructure Design Concepts3 - 15Virtual channel definitions could be defined as shown in the following figure.The virtual channel definitions mak

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR124Signal Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 16Virtual Channel Group SummaryVirtual channel groups are an easy way to create

SoundStructure Design Concepts3 - 17Physical Logic PinsThe physical logic pins and their labeling is shown in the following figure.The logic inputs a

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 18When multiple devices are OBAM linked as shown in the next figure, the logic i

SoundStructure Design Concepts3 - 19Logic InputsAll digital logic inputs (logic inputs 1 - 22) operate as contact closures and may either be connecte

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 20Logic OutputsAll logic outputs are configured as open-collector circuits and m

SoundStructure Design Concepts3 - 21Logic pins can be defined via the command line interface from SoundStructure Studio or a control terminal with th

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 22The value of the digital control array is the binary sum of the individual log

SoundStructure Design Concepts3 - 23IR Receiver Virtual ChannelThe IR receiver input on the SoundStructure device will respond with acknowledgments w

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR123 - 24

4 - 14Creating Designs with SoundStructure StudioSoundStructure Studio is the software environment for creating, managing, and documenting SoundStruct

5Wiring Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9–26Controlling The System . . . .

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR124 - 2• Follow the on-screen steps to specify the output signals• Select the SoundStr

Creating Designs with SoundStructure Studio4 - 3SoundStructure StudioThe first step to creating a SoundStructure design is to launch the SoundStructu

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR124 - 4of input (Ceiling, Lectern, …) and the quantity of the input and then click “Ad

Creating Designs with SoundStructure Studio4 - 5A typical system is shown in the next figure where a stereo program audio source, eight table microph

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR124 - 6Step 2 - Output SignalsIn step 2 of the design process, the outputs from the sy

Creating Designs with SoundStructure Studio4 - 7Step 3 - Device SelectionIn Step 3, the devices that will be used with the design are selected as sho

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR124 - 8Step 4 - Uploading Or Working OfflineIn step 4, the decision is made to either

Creating Designs with SoundStructure Studio4 - 9Once the finish button is clicked, the SoundStructure Studio software will create the entire design f

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR124 - 10Online vs. OfflineSoundStructure Studio has been designed to fully operate in

Creating Designs with SoundStructure Studio4 - 11In this example the virtual channel group “Mics” was muted and the console shows the command in blue

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR126API Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR124 - 12

5 - 15Customizing SoundStructure DesignsOnce a SoundStructure project file has been created as described in the previ-ous chapter, the SoundStructure

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 2physical channel.If it is necessary to change the wiring from the default wiri

Customizing SoundStructure Designs5 - 3When a virtual channel is moved, SoundStructure Studio redefines the virtual channel to use the new physical i

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 4Edit DevicesWhen working offline, the Wiring Page includes an “Edit Devices” c

Customizing SoundStructure Designs5 - 5fit into the next smaller SoundStructure device requires removing audio chan-nels from the “Edit Channels” con

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 6figures for examples of the different user controls.It is possible to change w

Customizing SoundStructure Designs5 - 7button as shown in the following figure.Editing Virtual ChannelsTo add or delete additional virtual channels,

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 8Channels page and there will be default gain settings for the devices and defa

Customizing SoundStructure Designs5 - 9Collapse buttons respectively.To create additional virtual channel groups, click the Edit Groups button on the

7Adjusting Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–22Command List . . . . . . . . . .

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 10Once a virtual channel group has been defined, virtual channels may be added

Customizing SoundStructure Designs5 - 11Any commands that are sent to configure the virtual channel group “Zone 1 Mics” will in turn be sent to the m

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 12there are no dashed lines around the gain for the “Zone 1 Mics” group.If a pa

Customizing SoundStructure Designs5 - 13Input Signal MetersAll these input channels have meters that will show the signal activity. The meters may be

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 14to the SoundStructure device, however the meters will be most responsive over

Customizing SoundStructure Designs5 - 15meter will show less signal activity. Since the level_pre meter position is before any processing has been ap

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 16adjustments.Line Input level_postLine input channels, such as program audio o

Customizing SoundStructure Designs5 - 17any processing and the level_post is after the processing.Conference Link ChannelsThe Conference Link channel

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR125 - 18Input Channel ControlsThis section discusses the input controls in the order

Customizing SoundStructure Designs5 - 19collapsed.Analog Signal GainSoundStructure devices have a continuous analog input gain stage that oper-ates o