Echo Cancellation and Noise Control in Hands-free Communication systems

• Main Authors: H. Z. Wu, 吳欣儒
• Other Authors: S. F. Hsieh
• Format: Others
• Language: en_US
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/85107860078083571190

碩士 === 國立交通大學 === 電信工程系 === 88 === Hands-free communication systems usually suffer from echo and environment noise. They exacerbate the communication quality. In this thesis, we present a unified approach of echo cancellation and noise control systems which are categorized into two classes. A new parallel structure is also proposed. We analyze and compare the residual error of both parallel and cascade structures. The theoretical analysis and the computer simulations show that the parallel structure has larger convergent ERLE than the cascade structure. We propose the implementation of impulse response measurements and suggest the subbanding parallel structure of echo and noise cancellation in a car chamber. This accelerates convergence rate and reduces the computation complexities.