立体声回波对消的算法性能实验研究及DSP实现的可行性分析

将自适应算法应用于实时立体声回波对消，以提高电话会议的通信质量．探讨了房间冲激响应为上百ms时，实时声回波对消自适应算法的收敛速度和立体声回波对消中的非唯一解问题．实验研究了输入为白噪声或语音信号、学习过程中发送房间冲激响应突变时，立体声回波对消自适应算法的失配和均方误差．比较了该算法的运算复杂度和采用DSP实现所需的指令周期．从DSP实时处理的可行性角度举例说明了选择适当DSP芯片的方法，为工程应用中构建以DSP为核心的声回波对消器提供了参考指标。

Investigation of Performance Research of Stereophonic Acoustic Echo Cancellation Algorithms and Feasibility Analysis of DSP Implementation

Adaptive algorithms are applied to real-time stereophonic acoustic echo cancellation to improve the communication quality of teleconference. When a room impulse response has a length of hundreds of milliseconds, the convergence rate of real-time acoustic echo cancellation adaptive algorithms and the non-uniqueness problem of stereophonic acoustic echo cancellation are discussed. When the input signal is white noise or speech signal and the transmission room impulse response changes abruptly in learning process, misalignment and mean square error of adaptive algorithms in stereophonic acoustic echo cancellation are researched. The computational complexity and the total number of instructions of DSPs are estimated to evaluate the performances of different algorithms. A method of choosing proper DSP chips is proposed from the point of view of DSP implementation feasibility. Authors provide reference guideline of constructing acoustic echo canceler based on DSPs for the engineering applications.