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    • 9. 发明授权
    • Combined speech coder and echo canceler
    • 组合语音编码器和回波消除器
    • US5857167A
    • 1999-01-05
    • US890964
    • 1997-07-10
    • Charles W.K. GrittonFiliz Basbug
    • Charles W.K. GrittonFiliz Basbug
    • G10L19/12G01L9/14G10L21/02H04B3/20H04B3/23H04M1/00H04M1/60H04R3/02
    • G10L19/12G10L2021/02082
    • An parametric speech codec; such as a CELP, RELP, or VSELP codec; is integrated with an echo canceler to provide the functions of parametric speech encoding, decoding, and echo cancellation in a single unit. The echo canceler includes a convolution processor or transversal filter that is connected to receive the synthesized parametric components, or codebook basis functions, of respective send and receive signals being decoded and encoded by respective decoding and encoding processors. The convolution processor produces and estimated echo signal for subtraction from the send signal. In order to process the synthesized parametric components having distinct basis functions in the convolution processor, conversion means are provided for providing the receive-side parametric component to the processor, or for providing the estimated echo signal, in terms of the send-side parameter. Plural convolution processors are provided for processing respective parametric components of the desired coding scheme.
    • 参数语音编解码器 例如CELP,RELP或VSELP编解码器; 与回波消除器集成,以在单个单元中提供参数语音编码,解码和回波消除的功能。 回波消除器包括卷积处理器或横向滤波器,其被连接以接收由相应的解码和编码处理器解码和编码的各个发送和接收信号的合成参数分量或码本基础函数。 卷积处理器产生和估计的回波信号用于从发送信号中减去。 为了处理在卷积处理器中具有不同基础函数的合成参数分量,提供了转换装置,用于将接收侧参数分量提供给处理器,或者根据发送侧参数提供估计的回波信号。 提供多个卷积处理器用于处理所需编码方案的相应参数分量。