This paper introduces the design and implementation of 2/4 lines speech interface and echo canceller. This 2/4 lines speech interface includes A/D,D/A conversion,ADPCM coding and decoding,and adaptive echo canceller etc.

• 文章介绍了一种2/4线话音接口和回波抵消器的设计与实现方案,该方案实现了2/4线的话音接口,包括A/D、D/A变换,ADPCM编解码,自适应回波抵消等。