ip电话的关键技术,包括语音编码,压缩,打包,分组交换,以及保证语音质量而采取的回声抵消技术.-ip telephone key technologies, including voice coding, compression, packing and packet switching, and voice quality assurance and the echo cancellation technology.

子带回波消除综述subband echo cancellation-Summary of sub-band wave eliminate subband echo cancellation

Diagram of Echo Cancellation FM2018