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    • 8. 发明授权
    • Transmission system with improved speech encoder
    • 具有改进语音编码器的传输系统
    • US06363340B1
    • 2002-03-26
    • US09316984
    • 1999-05-24
    • Robert J. SluijterRakesh Taori
    • Robert J. SluijterRakesh Taori
    • G10L1904
    • G10L19/04G10L19/22
    • A speech transmission system with an input speech signal applied to a speech encoder for encoding the speech signal which is transmitted via a communication channel to a speech decoder. Background noise dependent processing elements in the speech encoder and/ or speech decoder are introduced to improve the performance of the transmission system. The parameters of the perceptual weighting filter in the speech encoder are derived by calculating linear prediction coefficients from a speech signal which is processed by means of a high pass filter. An adaptive post filter in a speech decoder is bypassed when the noise level exceeds a threshold value.
    • 一种具有输入语音信号的语音传输系统,该语音信号被应用于语音编码器,用于对经由通信信道发送到语音解码器的语音信号进行编码。 引入了语音编码器和/或语音解码器中背景噪声相关的处理元件以改善传输系统的性能。 通过从通过高通滤波器处理的语音信号中计算线性预测系数,导出语音编码器中的感知加权滤波器的参数。 当噪声电平超过阈值时,语音解码器中的自适应后置滤波器被旁路。