Device and Method for Noise Shaping in a Multilayer Embedded Codec Interoperable with the ITU-T G.711 Standard
    9.
    发明申请
    Device and Method for Noise Shaping in a Multilayer Embedded Codec Interoperable with the ITU-T G.711 Standard 审中-公开
    可与ITU-T G.711标准互操作的多层嵌入式编解码器中的噪声整形的装置和方法

    公开(公告)号:US20110173004A1

    公开(公告)日:2011-07-14

    申请号:US12664010

    申请日:2007-12-28

    IPC分类号: G10L19/00

    摘要: A device and method for shaping noise during encoding of an input sound signal comprise pre-emphasizing the input signal or a decoded signal from a given sound signal codec to produce a pre-emphasized signal, computing a filter transfer function based on the pre-emphasized signal, and shaping the noise by filtering the noise through the transfer function to produce a shaped noise signal, wherein the noise shaping comprises producing a noise feedback. A device and method for noise shaping in a multilayer codec, including at least Layer 1 and 2, comprise: at an encoder, producing an encoded sound signal in Layer 1 including Layer 1 noise shaping, and producing a Layer 2 enhancement signal; at a decoder, decoding the Layer 1 encoded sound signal to produce a synthesis signal, decoding the enhancement signal, computing a filter transfer function based on the synthesis signal, filtering the enhancement signal through the transfer function to produce a Layer 2 filtered enhancement signal, and adding the filtered enhancement signal to the synthesis signal to produce an output signal including contributions from Layer 1 and 2.

    摘要翻译: 用于在编码输入声音信号期间整形噪声的装置和方法包括预先强调来自给定声音信号编解码器的输入信号或解码信号以产生预加重信号,基于预先强调的信号计算滤波器传递函数 信号和整形噪声,通过传递函数对噪声进行滤波以产生成形噪声信号,其中噪声整形包括产生噪声反馈。 包括至少第1层和第2层的多层编解码器中的噪声整形的装置和方法包括:在编码器处,产生包括层1噪声整形的层1中的编码声音信号,并产生第2层增强信号; 在解码器处,解码第1层编码声音信号以产生合成信号,对增强信号进行解码,基于合成信号计算滤波器传递函数,通过传递函数对增强信号进行滤波,以产生第2层滤波的增强信号, 并将经滤波的增强信号加到合成信号上以产生包括来自层1和2的贡献的输出信号。

    Perceptual weighting device and method for efficient coding of wideband signals
    10.
    发明申请
    Perceptual weighting device and method for efficient coding of wideband signals 审中-公开
    用于有效编码宽带信号的感知加权装置和方法

    公开(公告)号:US20050108007A1

    公开(公告)日:2005-05-19

    申请号:US10965795

    申请日:2004-10-18

    CPC分类号: G10L19/26 G10L2019/0011

    摘要: A perceptual weighting device for producing a perceptually weighted signal in response to a wideband signal comprises a signal pre-emphasis filter, a synthesis filter calculator, and a perceptual weighting filter. The signal pre-emphasis filter enhances the high frequency content of the wideband signal to thereby produce a pre-emphasized signal. The signal pre-emphasis filter has a transfer function of the form: P(z)=1−μz−1, wherein μ is a pre-emphasis factor having a value located between 0 and 1. The synthesis filter calculator is responsive to the pre-emphasized signal for producing synthesis filter coefficients. Finally, the perceptual weighting filter processes the pre-emphasized signal in relation to the synthesis filter coefficients to produce the perceptually weighted signal. The perceptual weighting filter has a transfer function, with fixed denominator, of the form: W(z)=A(z/γ1)/(1−γ2z−1) where 0

    摘要翻译: 用于响应于宽带信号产生感知加权信号的感知加权装置包括信号预加重滤波器,合成滤波器计算器和感知加权滤波器。 信号预加重滤波器增强了宽带信号的高频内容,从而产生预加重信号。 信号预加重滤波器具有以下形式的传递函数:P(z)= 1-muz -1,其中mu是具有位于0和1之间的值的预加重因子。 合成滤波器计算器响应预加重信号以产生合成滤波器系数。 最后,感知加权滤波器处理关于合成滤波器系数的预加重信号以产生感知加权信号。 感知加权滤波器具有如下形式的具有固定分母的传递函数:W(z)= A(z /γ1/ 2)/(1-γ2 其中0 <γ2<1 <1> <1> <1>