Polycom SoundStructure C16 Design Manual page 46

a call 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 rings.
.SoundStructure SR-Series Telco Processing
Telephony Processing
To Telco
from Matrix
Tone
Generator
From Telco
Fader
to Matrix
Typically, the telephony cards are 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 do not work with only SR-series devices because there
is no acoustic echo cancellation processing in the SR-series devices.
Note: Using Telephony Cards with the SR-Series
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.
Polycom, Inc.
Input
1
Processing
Input
2
Processing
Input
N
Processing
Dynamnics Parametric
Delay
Processing Equalization
Parametric Dynamics Automatic
Equalization Processing Gain Control
Call Progress
Detection
Telco
Telco
Telco
Processing
Telco
Processing
Processing
Processing
Output
1
Processing
Output
2
Processing
Matrix
Output
N
Processing
Submix SubMix
Processing
Processsing
Fader
Line Echo
Cancellation
Noise
Cancellation
Output to
D/A
Analog
PSTN Line
Converter
Gain
A/D Input from
Analog
Converter PSTN Line
Gain
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