Redução adaptativa de eco e de ruído para terminais viva-voz. / Speech enhancement and acoustic echo cancellation for hands-free sets.

AUTOR(ES)

André Horácio Camargo Carezia

DATA DE PUBLICAÇÃO

2002

RESUMO

There is currently great motivation in developing hands-free devices which offer users, engaged in a telephone conversation, a good level of naturalness and intelligibility. In this work, the goal is to present a solution for two well-known problems that occur when designing a hands-free device for use in automobile environments: (1) the acoustic echo coupling between microphone and speaker, and (2) the background noise generated for example by wind, tires and vehicle engine. The proposed solution includes adaptive filtering techniques and modifications in the speech signal spectrum, in order to minimize the two problems above. Theoretical issues are briefly analyzed, however the author believes no relevant detail is kept out. Highlighted in the report is a practical and efficient implementation of the algorithms in a modern digital signal processor.

ASSUNTO(S)

speech enhancement supressão de ruído para sinais de voz adaptive filters acoustic echo cancellation cancelamento de eco acústico algoritmos adaptativos

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