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AT2004 Datasheet, PDF (12/25 Pages) List of Unclassifed Manufacturers – 4 Channels ADPCM Processor with Echo Cancellation and Conferencing | |||
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AT2004
4 Channels ADPCM Processor with Echo Cancellation and Conferencing
EC Description
reset
0 Normal operation without reset of echo cancellation
1 Reset echo canceller internal states, the output of echo canceller is â0â
Default: 1
ADPCM Description
reset
0
Normal operation without reset of ADPCM
1
Reset ADPCM internal states
Default: 1
When ADPCM reset bit is â1â, ADPCM encoder will output âffâ, ADPCM decoder will output âffâ for u-law and âd5 â for A-law.
ADPCM Description
bypass
0
Normal operation with ADPCM
1
Bypass ADPCM
Default: 0
LawA Description
0 ADPCM side u-law
1 ADPCM side A-law
Default: 0
LawP Description
0 PCM side u-law
1 ADPCM side A-law
Default: 0
Idle Description
0 Normal operation
1 The output is tri-state during its time slot. Once this bit is cleared, it will
come back to normal operation
Default: 0
Conferencing Command Sequence
The Conferencing Command Sequence allows the user to specify up to three different conferencing sources for conferencing with the
current channel. Conferencing Command Sequences length is variable, and is dependent on the number of channels that are specified.
The format of the conferencing command consists of a header, a begin channel number byte, and a data portion containing conferencing
command reference pair information. The data portion also contains information for Gain control configuration.
A sample 4 âhalf-channelâ conferencing command is given below.
Page 12 of 25
©2001 Atelic System, Inc
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