AT2004

Features:

·  4 full channels of ITU G.726 ADPCM
·  4 full channels of ITU G.165/G.168 complia nt echo cancellation with up to 20ms echo delay
·  Fast and robust convergence for adaptive echo canceller, even in the presence of background noise
·  Nonlinear processing with adaptive suppression threshold and comfort noise generation for echo canceller
·  Per channel selectable m-Law and A-law input/output
·  On-chip time slot assignment
·  Available internal clock generator and frame sync. generator
·  Simple 3-wire serial command port for chip configuration
·  Conferencing capabilities for up to 3 additional sound sources


Application

·  DECT
·  VoIP / VoDSL
·  Wireless telephone systems
·  Wireless PBX systems


Pinout




Description

The AT2004 is a four full-duplex channels, ADPCM processor with conferencing and echo cancellation capabilities. It follows the G.726 ITU Standard for ADPCM compression for 40k, 32k,24k and 16k bitrates with selectable mlaw and Alaw input/output. AT2004 conforms to ITU G.165/G.168 Digital Adaptive Echo Canceller specification for line echo delay up to 20ms. Using the command serial interface, each individual half-channel can be independently configured for ADPCM, conferencing and echo canceling features.