TI 的回声抵消编程 Guide，详细介绍了 echo cancellation 的流程 并附有 C 编写的源代码-TI s echo cancel pragramming guide, it introduced the flow of echo cancellation in detail and also attached with the source code written in c.

ITU G.723.1编码算法的软件实现流程图,很好的指导实践！-G.723.1 coding algorithm realize the software flow chart