AT2004 Datasheet, PDF (18/25 Pages) List of Unclassifed Manufacturers – 4 Channels ADPCM Processor with Echo Cancellation and Conferencing

AT2004
4 Channels ADPCM Processor with Echo Cancellation and Conferencing
Channel 4: (encode ADPCM channel)
Conferencing:
Conferencing Disabled.
Gain Adjustment:
No output PCM gain adjustment (0 db gain).
Echo Canceling:
Echo canceling enabled with reference sample from Channel 0.
Delay (8ms)
MCU7byte Command:
• Encode (i.e. output is ADPCM sample sequence)
• u-Law input, 32k ADPCM algorithm.
• Input time slot: @xin[0:7]
• Output time slot: @xout[0:3]
Channel 5: (encode ADPCM channel)
Conferencing:
Conferencing Disabled.
Gain Adjustment:
No output PCM gain adjustment (0 db gain).
Echo Canceling:
Echo canceling enabled with reference sample from Channel 1.
Delay (8ms)
MCU7byte Command:
• Encode (i.e. output is ADPCM sample sequence)
• u-Law input, 32k ADPCM algorithm.
• Input time slot: @xin[16:23]
• Output time slot: @xout[16:19]
Channel 6: (encode ADPCM channel)
Conferencing:
Channel 0 + Channel 1 + Channel 5.
Gain Adjustment:
No output PCM gain adjustment (0 db gain).
Echo Canceling:
Echo canceling enabled with reference sample from Channel 2.
Delay (8ms)
MCU7byte Command:
• Encode (i.e. output is ADPCM sample sequence)
• u-Law input, 32k ADPCM algorithm.
• Input time slot: @xin[32:39]
• Output time slot: @xout[32:35]
Channel 7: (encode ADPCM channel)
Conferencing:
Channel 4 + Channel 5 + Channel 0.
Gain Adjustment:
No output PCM gain adjustment (0 db gain).
Echo Canceling:
Echo canceling enabled with reference sample from Channel 3.
Delay (8ms)
MCU7byte Command:
• Encode (i.e. output is ADPCM sample sequence)
• u-Law input, 32k ADPCM algorithm.
• Input time slot: @xin[48:55]
• Output time slot: @xout[48:51]
The following is command sequences of conferencing, per channel control and mcu7byte:
Command bytes sequence specifying conferencing.
20 // Begin conferencing command. This byte is fixed.
00 // This byte is fixed (usually begin specifying at channel 0).
00 // 0 channel high byte. Conferencing is disabled.
00 // 0 channel low byte
00 // 1 channel high byte
00 // 1 channel low byte
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©2001 Atelic System, Inc