The Study of Infinite Impluse Response In Acoustic Echo Cancellation

• Main Authors: Yu-Chieh Chang, 張育傑
• Other Authors: Junghsi Lee
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/64957497931864646914

碩士 === 元智大學 === 電機工程學系 === 91 === Hands-free communications system finds several applications such as speaker-phone, tele-video conferencing systems, distance learning and medicine systems. A major problem in hands-free system is that of acoustic echo. Adaptive filtering has been considered as a promising way in solving this problem. These algorithms including LMS family and RLS family employed by FIR and IIR systems. This thesis studies the performance of equation-error adaptive IIR echo canceller. Analysis shows that the equation-error IIR canceller outperforms its FIR counterpart with much smaller number of coefficients. Extensive simulation and experiments validate our analysis. The noise is also the problem we should overcome in the hands-free communications. Our analysis as well as experiments show the IIR echo canceller is capable of reducing the colored noise. We also present a scheme that deals with acoustic echo and noise.