An Adaptive Acoustic Echo Canceler for Hands-Free Teleconferencing

✍ Scribed by Rajiv Porayath; John F. Doherty; Steve F. Russell

• Book ID: 102568568
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 130 KB
• Volume: 6
• Category: Article
• ISSN: 1051-2004
• DOI: 10.1006/dspr.1996.0004

✦ Synopsis

listening apparatus, which are transmitted back as tive Acoustic Echo Canceler for Hands-Free Teleconferencdelayed replicas of the speaker's voice. The nature ing, Digital Signal Processing 6 (1996), 29-36. of the acoustic echo patterns can change rapidly due to variations in the environment, for example, open-A new technique for high quality acoustic echo cancellaing and closing of doors. The standard approach to tion in teleconference and speaker phone systems has been eliminating the acoustical echo is to use a discretedeveloped. The new echo canceler is based on an enhanced time linear adaptive filter at the receiver where the adaptive filtering algorithm and uses a spread-spectrumbased technique to mitigate the effects of double talk. The echo is predominant. This filter is used to quantitatest facility used to develop this new acoustic echo canceler tively characterize the acoustical link between the and the system design of echo canceler are described.

speaker and the microphone, thus generating an