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ViewStation EX, ViewStation FX, and VS4000 API Guide
© Polycom, Inc. 2003 197
h331audiomode <g728|g711u|g711a|g722-56|
g722-48|off|get>
Description
This command sets the H.331 audio protocol for transmitting audio
in broadcast mode. Broadcast configuration parameters should be
set to accommodate the lowest common denominator of the
systems which are receiving the broadcast.
g728 ITU-T Recommendation for audio encoding using Low
Delay Code Excited Linear Prediction (CELP). The
bandwidth of the analog audio signal is 3.4 kHz
whereas after coding and compression the digitized
signal requires a bandwidth of 16 Kbps.
g711u CCITT (now called ITU-T, which is International
Telecommunications Union's Telecommunications
Standardization Sector) Recommendation entitled
"Pulse Code Modulation (PCM) of Voice Frequencies."
G.711 defines how a 3.1 kHz audio signal is encoded at
64 Kbps using PCM and either mu-law (US and Japan)
or A-law (Europe).
g711a Same as g711u, but uses A-law (Europe).
g722-56 CCITT Recommendation that defines how a 7.5 kHz
audio signal is encoded at a data rate of 64 Kbps.
g722-48 CCITT Recommendation that defines how a 7.5 kHz
audio signal is encoded at a data rate of 64 Kbps.
off Turns the audio mode off.
get Displays the current setting for this option.
Example
h331audiomode g728
h331audiomode