Research On Acoustic Echo Cancellation Algorithm Based On Smart Acoustic Room System And Correlation Function

With the developing information age, the issue of communication quality has become one of the most popular and important topics in the field of signal processing. Since long ago, the echo problem has been a major trouble that is negative to the communication quality. Echo can be divided into circuits echo and acoustic echo according to their causes, and in which the realization of acoustic echo cancellation is particularly difficult. This article focuses on the method of acoustic echo elimination.At present, the echo cancellation devices that in the main use the traditional adaptive filtering algorithm represented by the Least Mean Square (LMS) algorithm have been widely used. The biggest disadvantage of traditional adaptive filtering algorithm is that it is can only applicable to the single-talk environment but the double-talk environment that now prevails. In recent years, a class of new type adaptive filtering algorithm based on the correlation function that designed for double-talk environment has been proposed. These new algorithms can separate the echo signal from the information witch is received by the microphone. It can solve the algorithm failure problem effectively under the double-talk environment. But the current adaptive filtering algorithm based on correlation function is generally inefficient and in low convergence rate, just remain in the step of theory, the practical application is difficult.This paper improved the existing adaptive filtering algorithm based on correlation function according to the characteristics of voice communication, proposed the Separate Proportion Hartley Transform Expanded Correlation Least Mean Square (SPHECLMS) algorithm. Simulation results show that the efficiency and the convergence rate of the new algorithm are greatly enhanced; it is more suitable for practical application.The smart acoustic room (SAR) system is a novel acoustic control system, with the impulse response of sound control. This paper proposed a new SAR system model based on correlation function with echo cancellation capability by introducing adaptive filtering algorithm based on correlation function. This model is different from all current echo canceller which eliminate the acoustic echo through the circuit. It can create an echo zero point on microphone position. It is a new acoustic echo cancellation system which eliminate the acoustic echo through acoustic way directly.The paper conclude with combining SPHECLMS algorithms and SAR system based on correlation functions and further proposed the echo canceller based SAR systems and SPHECLMS, which is a new acoustic echo canceller by using acoustic way. The simulation results show that the new echo canceller has a good performance.