Analysis filterbank, synthesis filterbank, encoder, decoder, mixer and conferencing system
    3.
    发明公开
    Analysis filterbank, synthesis filterbank, encoder, decoder, mixer and conferencing system 有权
    分析滤波器组,合成滤波器组,编码器,解码器,混音器和会议系统

    公开(公告)号:EP2113910A1

    公开(公告)日:2009-11-04

    申请号:EP09010178.3

    申请日:2007-08-29

    IPC分类号: G10L19/02

    摘要: An embodiment of a synthesis filterbank (800) for filtering a plurality of input frames, wherein each input frame comprises M ordered input values y k (0), ..., y k (M-1), comprises an inverse type-IV discrete cosine transform frequency/time converter (810) for providing a plurality of output frames, an output frame comprising 2M ordered output samples x k (0), ..., x k (2M-1), a windower (820) for generating a plurality of windowed frames, a windowed frame comprising a plurality of windowed samples z k (0), ..., z k (2M-1), an overlap/adder (820) for providing an intermediate frame comprising a plurality of intermediate samples m k (0), ..., m k (M-1) and a lifter (830) for providing an added frame comprising a plurality of added samples out k (0), ..., out k (M-1) based on the equation out k n = m k n + l ⁢ n - M / 2 ⋅ m k - 1 ⁢ M - 1 - n for n = M / 2 , … , M - 1 and out k n = m k n + l ⁢ M - 1 - n ⋅ out k - 1 ⁢ M - 1 - n for n = 0 , … , M / 2 - 1 , wherein 1(0), ...,1(M-1) are real-valued lifting coefficients.

    摘要翻译: 用于对多个输入帧进行滤波的合成滤波器组(800)的实施例(其中每个输入帧包括M个有序输入值yk(0),...,yk(M-1))包括反向类型-IV离散余弦 用于提供多个输出帧的变换频率/时间转换器(810),包括2M个有序输出样本xk(0),...,xk(2M-1)的输出帧,加窗器(820),用于生成多个 包括多个加窗样本zk(0),...,zk(2M-1)的加窗帧,用于提供包括多个中间样本mk(0)的中间帧的重叠/加法器(820) ,...,mk(M-1)和提升器(830),用于基于等式outkn = mkn提供包括多个相加样本outk(0),...,outk(M- 对于n = M / 2,...,M-1和outkn = mkn + lM-1-n⋅outk-1M-1-n = 0,...,M / 2-1,其中1(0),...,1(M-1)是实值提升系数。

    Vector quantization codebook generation method
    8.
    发明公开
    Vector quantization codebook generation method 失效
    矢量量化码本生成方法

    公开(公告)号:EP1085504A3

    公开(公告)日:2001-03-28

    申请号:EP00126875.4

    申请日:1997-11-06

    IPC分类号: G10L19/12

    摘要: A CELP speech coder or decoder comprising an adaptive codebook (223) for generating an adaptive code vector; a random codebook (221,222), for generating a random code vector; a synthesis filter (215) for receiving a random code vector generated from the random codebook (221,222) so as to perform LPC synthesis; wherein said random codebook (221,222) is formed by an excitation vector generator comprising fixed waveform arranging means (182) for arranging one or more fixed waveforms (v1,v2,v3) stored in a fixed waveform storage means (181) in accordance with the positions (P1,P2,P3) and polarities of an input impulse vector when the input speech is determined to be unvoiced.

    摘要翻译: 一种CELP语音编码器或解码器,包括用于生成自适应码矢量的自适应码本(223) 随机码本(221,222),用于生成随机码向量; 合成滤波器(215),用于接收从随机码本(221,222)产生的随机码向量以执行LPC合成; 其中所述噪声码本由一个激励矢量产生器构成,该激励矢量产生器包括固定波形安排装置,用于根据该固定波形安排装置安排存储在一个固定波形存储装置中的一个或多个固定波形(v1,v2,v3) 当输入语音被确定为清音时的位置(P1,P2,P3)和输入脉冲向量的极性。