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AT2004
4 Channels ADPCM Processor with Echo Cancellation and Conferencing
Page 12 of 25
©2001 Atelic System, Inc
EC
reset
Description
0
Normal operation without reset of echo cancellation
1
Reset echo canceller internal states, the output of echo canceller is “0”
Default: 1
ADPCM
reset
Description
0
Normal operation without reset of ADPCM
1
Reset ADPCM internal states
Default: 1
When ADPCM reset bit is ‘1’, ADPCM encoder will output “ff”, ADPCM decoder will output “ff” for u-law and “d5 ” for A-law.
ADPCM
bypass
Description
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 ‘half-channel’ conferencing command is given below.
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