AT2004 Datasheet, PDF (14/25 Pages) List of Unclassifed Manufacturers – 4 Channels ADPCM Processor with Echo Cancellation and Conferencing

AT2004
4 Channels ADPCM Processor with Echo Cancellation and Conferencing
Reference Designs and Additional Notes
Sample Usage of Echo Canceling
Echo Cancellation Configuration
Far end talker
-9 ~ -35dBm
hybrid
X
-12 ~ -38dBm
Echo
RxF
-12 ~ -17dBm
ERL (-6 ~ -11dB)
TxF
Note:
EC: echo cancellation
ERL: echo return loss
ADC: analog to digital conversion
DAC: digital to analog conversion
ADC
yx
DAC
y
+ +
u
rh
EC
u
y
Combo
AT2004
Near end talker
Page 14 of 25
©2001 Atelic System, Inc