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MSM7620 - Echo Canceler

Description

The MSM7620 is an improved version of the MSM7520 with the same basic configuration.

The MSM7620 includes following improvements: a modified through mode, timing control of the control pin input, and a thinner package.

The MSM7620 also provides a pin-for-pin replacement with the MSM7520.

Features

  • Handles both acoustic echoes and telephone line echoes.
  • Cancelable echo delay time: MSM7620-001 For a single chip: 23 ms (max. ) MSM7620-011 For a cascade connection (can also be used for a single chip) Master chip: 23 ms (max. ) Slave chip: 31 ms (max. ) Cancelable up to 213 ms (one master plus six slaves) For a single chip: 23 ms (max. ).
  • Echo attenuation : 30 dB (typ. ).
  • Clock frequency : 18 MHz (36 MHz cannot be used) External input and internal oscillator.

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Full PDF Text Transcription

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E2U0038-28-81 ¡ Semiconductor MSM7620 ¡ Semiconductor Echo Canceler This version: Aug. 1998 MSM7620 Previous version: Nov. 1996 GENERAL DESCRIPTION The MSM7620 is an improved version of the MSM7520 with the same basic configuration. The MSM7620 includes following improvements: a modified through mode, timing control of the control pin input, and a thinner package. The MSM7620 also provides a pin-for-pin replacement with the MSM7520. The MSM7620 is a low-power CMOS IC device for canceling echo (in an acoustic system or www.DataSheet4U.com telephone line) generated in a speech path. Echo is canceled (in digital signal processing) by estimating the echo path and generating a pseudo-echo signal.
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