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Design Guide for the Polycom SoundStructure C16, C12, C8, and SR12
5 - 14
to the SoundStructure device, however the meters will be most responsive
over the Ethernet interface. If meters are viewed over the RS-232 interface, it is
recommended that the highest data rate of 115,200 baud be used to minimize
any lag between registering for meters and having the meter information dis-
played on the screen.
Meter Types
There are typically two types for meters that are available for each input chan-
nel - a level that is before, or pre, any processing known as a level_pre and a
level that is after, or post, any input processing known as level_post.
The level_pre meter always shows the signal level just after the A/D con-
verter. This meter shows the effect of the analog signal gain before any digital
processing takes place as shown in the following figure. Chapter 7 discusses
how the analog gain should be set for best performance. The level_pre for all
input signals is shown in the following figure.
Within SoundStructure Studio, the level_pre signal meter is adjacent to the
analog input gain slider in SoundStructure Studio, as shown in the following
figure. Adjustments to the gain slider will be reflected in the meter - add more
gain and the meter will show more signal activity. Lower the gain and the
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
C-Series Input Processing
e
Parametric
Equalization
A/D
Converter
Analog
Gain
level_pre
level_pre