Polycom C16 - Manual (Page 21)

SoundStructure Product Family
2 - 7
C-Series Input Processing
The input processing on the SoundStructure C-series devices is designed to
make it easy to create conferencing solutions either with or without sound
reinforcement. Each audio input on a SoundStructure C-series device has the
processing shown in the following table.
The signal processing follows the signal flow shown in the following figure.
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
Input Processing
Up to 8th order highpass and lowpass
1st or 2nd order high shelf and low shelf
10-band parametric equalization
Acoustic echo cancellation, 20-22kHz 200 msec tail-time, monaural or stereo
Automatic gain control: +15 to -15dB
Dynamics processing: gate, expander, compressor, limiter, peak limiter
Feedback Eliminator: 10 adaptive filters
Noise cancellation: 0-20dB noise reduction
Automixer: gain sharing or gated mixer
Signal fader gain: +20 to -100 dB
Signal delay to 1000 msec
1
2
N
1
2
N
Telco
Processing
Telco
Processing Telco
Processing Telco
Processing
Matrix
Processing SubMix Submix
Processsing
Output
Processing
Output
Processing
Output
Processing
Input
Processing
Input
Processing
Input
Processing
Mic or Line
Input
Input to
Matrix
Input to
Matrix
Parametric
Equalization
A/D
Converter
Analog
Gain
Acoustic Echo
Cancellation
Noise
Cancellation
Automatic
Gain Control
Automixer
AGC Dynamics Fader Delay
Fader Automixer
Automixer
Delay
Automatic
Gain Control
Non Linear
Processing
Feedback
Cancellation
Dynamics
Processor
Dynamics
Processor Fader
Input to
Matrix
Automatic
Gain Control Fader Delay Dynamics
Processor
Delay
Mute
Router
Recording/
Ungated
Conferencing
Sound
Reinforcement