AT2004 Datasheet, PDF (5/25 Pages) List of Unclassifed Manufacturers – 4 Channels ADPCM Processor with Echo Cancellation and Conferencing

AT2004
4 Channels ADPCM Processor with Echo Cancellation and Conferencing
Echo Canceller Block Diagram:
Dc_rmv
Comfort
Noise ^NLP_flag
EC
Bypass
DC
Remover
-
M
NLP
U
X
Stepsize
Freeze
Adaptive
Filter
Dc_rmv
DC
Remover
Double Talk
Detector
Narrow Band
Signal Detector
Disabling Tone
Detector
No. 5, 6, 7
Signalling Tone
Detector
Tone_flag
Note:
• A dotted line with arrow mark indicate the control bit in the per channel control command, such
as LawP, EC reset, LawA, ADPCM bypass, ADPCM reset, Channel bypass, Dc_rmv, Comfort
noise, NLP_flag, EC bypass, Stepsize, Freeze and Tone_flag. Please refer to page 10, 11 and
12 for detail information.
• Only one full channel is shown. AT2004 has additional capability to process up to 4 full
channels simultaneously.
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©2001 Atelic System, Inc