Polycom SoundStructure C16 Design Manual page 100

Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
Phone In
Channel
To Telco
from Matrix
From Telco
to Matrix
5 - 18
Telephony leve_pre and level_post
For telephony channels, the level_pre and level_post for the phone input chan-
nel and level_post for the phone output channels are shown in the following
figure. As with the analog input and output channels, the level_pre is before
any processing and the level_post is after the processing.
Telephony Processing
Dynamnics Parametric
Processing Equalization
Tone
Generator
Parametric Dynamics
Fader
Equalization Processing Gain Control
Call Progress
level_post
Conference Link Channels
The Conference Link channels for HDX Program Audio in and HDX Video
Call In have a level_pre and level_post as shown on the following figure. The
HDX PSTN In and HDX UI Audio In channels do not have level_pre or
level_post meters as those signals are available directly at the matrix and do
not have any input processing on a SoundStructure device.
level_post
Delay Fader
Converter
Line Echo
Cancellation
Automatic Noise
Cancellation Converter
Detection
Output to
D/A
Analog
PSTN Line
Gain
A/D Input from
Analog
PSTN Line
Gain
level_pre
Phone Out
Channel