Polycom SoundStructure C16 Design Manual page 23

The signal processing follows the signal flow, as shown in the following figure.
SoundStructure C-Series Signal Processing and Signal Flow
Mic or Line A/D Parametric
Analog
Input Converter Equalization
Gain
Each analog input signal has an analog gain stage that is used to adjust the gain of the input signal to the
SoundStructure's nominal signal level of 0 dBu. The analog gain stage can provide from -20 to 64 dB of gain
in 0.5 dB steps. There is also an option to enable 48 V phantom power on each input. Finally the analog
input signal is digitized and available for processing. The digital signal is processed by five different DSP
algorithms: parametric equalization, acoustic echo cancellation, noise cancellation, feedback reduction, and
echo suppression (non linear processing).
Polycom, Inc.
Input
1
Processing
Input
2
Processing
Input
N
Processing
Non Linear
Acoustic Echo Noise
Processing
Cancellation Cancellation
Feedback
Cancellation
Telco
Telco
Telco
Processing
Telco
Processing
Processing
Processing
Output
1
Processing
Output
2
Processing
Matrix
Output
N
Processing
Submix SubMix
Processing
Processsing
AGC Dynamics
Automatic Dynamics
Gain Control Processor
Automixer
Automatic Dynamics
Automixer
Gain Control Processor
Automatic Dynamics
Automixer
Gain Control Processor
Fader Delay Mute
Input to
Fader Delay
Matrix
Input to
Fader Delay
Matrix
Input to
Fader Delay
Matrix
Recording/
Ungated
Conferencing
Sound
Reinforcement
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