Polycom C16 - Manual (Page 43)

SoundStructure Product Family
2 - 29
progress detector that analyzes the telephony input signal and reports if any
call progress tones are present (for example, if the telephony line is busy, the
phone is ringing, etc.).
Typically, the telephony cards will be used in the C-series devices for audio
conferencing applications. The telephony cards are also supported on the
SR-series allowing additional plug-in cards for multiple audio conferencing
telephone lines when C-series products are used with SR-series products. In
some commercial sound applications it is also useful to have telephony access
to either broadcast or monitor the audio in the system. Audio conferencing
applications will not work with only SR-series devices because there is no
acoustic echo cancellation processing in the SR-series devices.
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
Fader
Tone
Generator
Delay
A/D
Converter
Analog
Gain
D/A
Converter
Analog
Gain
Input from
PSTN Line
Output to
PSTN Line
From Telco
to Matrix
To Telco
from Matrix
Noise
Cancellation
Parametric
Equalization
Dynamnics
Processing Fader Delay
Line Echo
Cancellation
Call Progress
Detection
Automatic
Gain Control
Dynamics
Processing
Parametric
Equalization
Telephony Processing
The telephony cards should not be used with the SR-series of products for audio
conferencing applications (i.e., simultaneous two-way audio communication) unless
all the microphones in the system are connected to SoundStructure C-series
devices. The SR-series products do not have acoustic echo cancellation.