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AT2004

更新时间： 2024-09-16 21:54:59

品牌	Logo	应用领域
其他 - ETC		PC
页数	文件大小	规格书
25页	324K
描述
4 Channels ADPCM Processor with Echo Cancellation and Conferencing

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AT2004 数据手册

AT2004

4 Channels ADPCM Processor with Echo Cancellation and Conferencing

Atelic Systems, Inc.

AT2004 Application Note Preliminary

4 Channels ADPCM Processor with Echo Cancellation and Conferencing

Version 1.0 January 29, 2001

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 m-law and A-

law input/output. It 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.

Features

4 full channels of ITU G.726 ADPCM

4 full channels of ITU G.165/G.168 compliant 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

Applications

DECT

VoIP / VoDSL

Wireless telephone systems

Wireless PBX systems

Default Settings

4 channels of m-law PCM input on Xin in time slot 0, 1, 2, 3

4 channels of the corresponding ADPCM output at 32kbps on Xout in time slot 0, 1, 2, 3

4 channels of ADPCM input at 32kbps on Yin in time slot 0, 1, 2, 3

4 channels of corresponding PCM m-law output on Yout in time slot 0, 1, 2, 3

Echo cancellation enabled for four channels

Conferencing disabled

Note: To change the default settings, commands could be sent through the 3-wire interface.

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