基于CX20707 SPoC在安防楼宇对讲中的回声消除设计

Echo cancellation design in building intercom system based on CX20707 SPoC

针对安防楼宇对讲系统中回声难于消除的问题,简要阐述了回声产生的原因及原理和当前主要的回声消除技术,重点介绍了Conexant CX20707 SPoC回声消除芯片的基本特性,及在模拟楼宇对讲系统和数字楼宇对讲系统中CX20707的音频流处理设计流程。实践中基于CX20707设计的楼宇对讲产品,其声学回声和线路回声都得到比较好地抑制,各项语音通话技术指标均满足公安部楼寓对讲系统技术标准的测试要求,值得在楼宇对讲系统中进行推广和应用。

In view of the problem which it is difficult to cancel echo in building intercom system, briefly expounds the echo causes and principle and the current main echo cancellation technology, introduced the Conexant CX20707 SPoC echo cancellation chip basic characteristic, and the audio stream processing design flow of CX20707 in analog building intercom system and digital building intercom system. In the practice, the building intercom system which based on CX20707 design, its acoustic echo and line echo are under quite good suppression, and each voice telephone conversation technical specification meet the ministry of public security building intercom system technology standard testing requirements. Therefore, it is worthy to be promoted and applied in the building intercom system.