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TroubleShooting
10 - 5
Mute all the microphones except for one and on the unmuted microphone,
check the value of the AEC reference. In the following figure the AEC refer-
ence is set to the “Amplifier” stereo virtual channel.
Next, check the matrix to ensure the “Amplifier” virtual channel includes the
remote audio sources. An example of the “Amplifier” channel and all the
remote audio sources that make up the “Amplifier” channel is shown in the
following figure. Notice that the audio from the Polycom HDX, the telco
audio, the program audio, and the audio from the remaining remote source
are all part of the “Amplifier” virtual channel and consequently used as the
AEC reference.
If the AEC reference does not include a particular remote audio source, then
whenever that remote audio source is active, there will be residual echo sent
back to that remote source. For example, if the telephone signal is not part of
the reference, then when the telephone participants speak, they will hear an
echo of their voice being sent back to themselves.
If the reference is set properly, and the reference is configured properly in the
matrix, the next step is to check the room gain of the system and make sure it
is not too high. Chapter 7 discusses acceptable room gain levels, and how to
- Design Guide 1
- C16, C12, C8, and SR12 1
- Trademark Information 2
- Patent Information 2
- Contents: 3
- Introduction 11
- Introduction 13
- SoundStructure Product Family 15
- C16 C12 C8 SR12 16
- # inputs 16 12 8 12 16
- # outputs 16 12 8 12 16
- # submixes 16 12 8 12 16
- OBAM™ - One Big Audio Matrix 17
- 16x16 12x12 8x8 18
- 36x12 36x8 18
- SoundStructure Installation 20
- C-Series Input Processing 21
- UNGATED - Bypass 25
- C-Series Matrix Crosspoints 26
- C-Series Output processing 27
- C-Series Submix Processing 28
- Local Room 29
- SR-Series 31
- SR-Series Input Processing 33
- Noise Cancelled 35
- SR-Series Output Processing 40
- Telephony Processing 41
- Physical Channels 46
- OBAM IIN OUT 48
- SoundStructure C16 49
- Device A 50
- Device B 50
- Device C 50
- Physical Channel Summary 53
- Virtual Channel Summary 55
- Virtual Channel Groups 56
- Telephone Virtual Channels 60
- Logic Pins 60
- Physical Logic Pins 61
- Chassis GroundChassis Ground 64
- IR Receiver Virtual Channel 67
- Creating Designs with 69
- SoundStructure Studio 69
- Step 2 - Output Signals 74
- Step 3 - Device Selection 75
- Online vs. Offline 78
- Wiring Page 81
- Edit Devices 84
- Editing Virtual Channels 87
- Monaural Stereo 88
- Input Signals 92
- Input Signal Meters 93
- Input Channel Controls 98
- Analog Signal Gain 99
- Phantom Power 100
- Ungated Type 101
- Favorite Content 103
- Delay Type 104
- Delay Compensation 106
- Equalization 108
- Feedback Elimination 110
- Recording/ 111
- Conferencing 111
- Reinforcement 111
- Noise Cancellation 113
- Automatic Gain Control (AGC) 114
- Dynamics Processing 115
- Input Level (dB) 117
- Output Level (dB) 117
- Threshold 117
- Automatic Microphone Mixing 119
- Signal Generator 125
- Output Signals 126
- Dynamics 127
- Submix Signals 130
- Matrix Page 132
- Adjusting Crosspoints 134
- Matrix summary 139
- Telephony Channels 140
- Input Gain 141
- Telephone Controls 145
- Physical Connections 149
- Polycom HDX Integration 150
- SoundStructure 151
- Inputs from 154
- Polycom HDX 154
- Outputs to 156
- Mute Control 157
- Volume Control 159
- Bottom ViewTop View 161
- Orientation 161
- OUTPUTS INPUTS 162
- Detecting CLink2 Devices 164
- HDX Mic 1 HDX Mic 2 169
- Installation Options 171
- POLYCOM POLYCOM 173
- Configuration Files 177
- Wiring The Devices 178
- Updating Firmware 183
- Configuring The Signal Gains 186
- Signal Meters 187
- Room Gain 188
- Telephony Signal Levels 190
- Phone In 191
- Phone Out 191
- Output Signal Levels 192
- Amplifier 195
- Preset Operation 197
- Saving Presets 198
- Creating Partial Presets 200
- Running Presets 204
- Removing Presets 205
- Network Management 207
- Dynamic IP Addresses 208
- Static IP Addresses 209
- Setting The Time Server 211
- Control And Command Sessions 211
- AMX Beacon 213
- Network Management 215
- Advanced Applications 217
- SoundStructure Studio Steps 218
- Advanced Applications 219
- Channels Page 220
- Matrix Settings 222
- Wiring Information 222
- Controlling The System 223
- CLink2 (R) 226
- CLink2 (L) 226
- Channels Settings 231
- Amplifier 1 Amplifier 2 244
- LEFTRIGHT 257
- POLYCOMPOLYCOMPOLYCOM 270
- POLYCOMPOLYCOM 270
- 4, 5, and 6 289
- Combined Mode 295
- Combined Room Settings 300
- Split Room Settings 303
- TroubleShooting 309
- TroubleShooting 311
- Echo Troubleshooting 312
- Output Processing 315
- API Troubleshooting 317
- RS-232 Troubleshooting 320
- System Status 321
- Telco Troubleshooting 322
- Ethernet 323
- Hardware Troubleshooting 324
- OBAM Troubleshooting 325
- Contacting Technical Support 326
- Specifications 329
- Specifications 331
- Pin Out Summary 332
- Conference Link2 333
- OBAM Link 334
- IR Receiver 335
- Logic Interface 336
- Audio Connections 337
- Balanced Audio Connections 338
- Unbalanced Audio Connections 338
- Using SoundStructure Studio 339
- Controls 339
- Adjusting Matrix Crosspoints 340
- Pin 1Pin 5 344
- Pin 9 Pin 6 344
- Virtual Channels 346
- Warni ng 347
- Virtual Channel Group 348
- SoundStructure Command Syntax 349
- Command Format 352
- Control Commands 353
- <pctype> 356
- Adjusting Parameters 364
- Command List 370
- SoundStructure Parameters 372
- Examples 373
- Matrix Parameters 378
- Telephony Parameters 383
- Equalizer Parameters 397
- Algorithm Parameters 426
- Input Path Parameters 440
- Automixer Parameters 442
- GPIO Control Parameters 449
- Control Port Parameters 452
- System Parameters 456
- Description 462
- Designing Audio Conferencing 463
- Large Room Environments 464
- Microphone Fundamentals 465
- Microphones For Conferencing 468
- Automatic Microphone Mixers 471
- Acoustic Echo Cancellation 473
- AEC Reference 475
- Tail Time 475
- Transmission Delay 476
- Echo Return Loss 477
- Muting Microphones 479
- Telephone Hybrid 481
- Amplifiers 483
- Loudspeakers 483
- Speaker Zoning And Placement 485
- Spatial Directionality 487
- In-Room Reinforcement 488
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