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    • 1. 发明授权
    • Analysis-by-synthesis speech coding method with open-loop and
closed-loop search of a long-term prediction delay
    • 具有开环和闭环搜索的长期预测延迟的综合语音编码方法
    • US5974377A
    • 1999-10-26
    • US860673
    • 1997-10-14
    • William NavarroMichel Mauc
    • William NavarroMichel Mauc
    • G10L13/00G10L19/09G10L25/93G10L3/02
    • G10L19/09G10L25/93
    • A method comprising the steps of performing a linear prediction analysis of a speech signal digitized in a series of frames divided into sub-frames, in order to determine the parameters of a short-term synthesis filter; carrying out an open loop analysis to detect voiced signal frames and determine, for each voice frame, a degree of signal voicing and a long-term prediction delay search interval containing a number of delays depending on the degree of voicing; carrying out a closed-loop predictive analysis of the speech signal to select, for at least some sub-frames of the voiced frames, a long-term prediction delay contained in the search interval and constituting a long-term synthesis filter parameter; and determining a stochastic excitation for each sub-frame, to minimize a perceptually weighted deviation between the speech signal and the stochastic excitation filtered by the long-term and short-term synthesis filters.
    • PCT No.PCT / FR96 / 00004 Sec。 371日期1997年10月14日第 102(e)日期1997年10月14日PCT 1996年1月3日PCT PCT。 出版物WO96 / 21218 PCT 日期:1996年7月11日一种方法,包括以下步骤:对分成子帧的一系列帧中数字化的语音信号进行线性预测分析,以确定短期合成滤波器的参数; 进行开环分析以检测有声信号帧,并且针对每个语音帧确定包含根据发音程度的多个延迟的信号发声程度和长期预测延迟搜索间隔; 对所述语音信号进行闭环预测分析,对于所述有声帧的至少一些子帧,选择包含在所述搜索间隔中并构成长期合成滤波器参数的长期预测延迟; 并确定每个子帧的随机激励,以最小化语音信号与由长期和短期合成滤波器滤波的随机激励之间的感知加权偏差。
    • 2. 发明授权
    • Analysis-by-synthesis speech coding method with truncation of the
impulse response of a perceptual weighting filter
    • 具有截短感知加权滤波器的脉冲响应的综合语音编码方法
    • US5963898A
    • 1999-10-05
    • US860746
    • 1997-10-22
    • William NavarroMichel Mauc
    • William NavarroMichel Mauc
    • G10L19/083G10L19/10G10L25/24G10L25/93G10L3/02
    • G10L19/083G10L19/10G10L25/24G10L25/93
    • A linear prediction analysis is performed for each frame of a speech signal to determine the coefficients of a short-term synthesis filter and an open-loop analysis is performed to determine a degree of frame voicing. At least one closed-loop analysis is performed for each sub-frame to determine an excitation sequence which, when applied to the short-term synthesis filter, generates a synthetic signal representative of the speech signal. Each closed-loop analysis uses the impulse response of a filter consisting of the short-term synthesis filter and a perceptual weighting filter, by truncating the impulse response to a truncation length that is no greater than the number of samples per sub-frame and is dependent on the energy distribution of the response and the degree of voicing of the frame.
    • PCT No.PCT / FR96 / 00006 Sec。 371日期1997年10月22日第 102(e)日期1997年10月22日PCT 1996年1月3日PCT PCT。 出版物WO96 / 21220 PCT 日期1996年7月11日对语音信号的每个帧执行线性预测分析,以确定短期合成滤波器的系数,并且执行开环分析以确定帧发音的程度。 对每个子帧执行至少一个闭环分析以确定当施加到短期合成滤波器时产生表示语音信号的合成信号的激励序列。 每个闭环分析使用由短期合成滤波器和感知加权滤波器组成的滤波器的脉冲响应,通过将脉冲响应截断为不大于每个子帧的样本数量的截断长度,并且是 取决于响应的能量分布和帧的发声程度。
    • 3. 发明授权
    • Speech coding method using synthesis analysis using iterative
calculation of excitation weights
    • 使用迭代计算激励权重的语音编码方法
    • US5899968A
    • 1999-05-04
    • US860799
    • 1997-10-14
    • William NavarroMichel Mauc
    • William NavarroMichel Mauc
    • G10L19/10G10L9/14
    • G10L19/10
    • A linear prediction analysis is performed for each frame of a speech signal to determine the coefficients of a short-Term synthesis filter. For each sub-frame, an excitations sequence which, when applied to the short-term synthesis filter generates a synthetic signal representative of the speech signal, is determined by means of an iterative process in which a symmetrical matrix B.sub.n, is gradually built up with each iteration. The matrix B.sub.n is reversed with each iteration by decomposing the pattern B.sub.n =L.sub.n .multidot.R.sub.n.sup.T with L.sub.n =R.sub.n .multidot.K.sub.n where L.sub.n and R.sub.n are triangular matrices and K.sub.n is a diagonal matrix, and matrix L.sub.n has only 1s on its main diagonal.
    • PCT No.PCT / FR96 / 00005 Sec。 371日期1997年10月14日第 102(e)日期1997年10月14日PCT 1996年1月3日PCT PCT。 出版物WO96 / 21219 日期1996年7月11日对语音信号的每个帧执行线性预测分析,以确定短期合成滤波器的系数。 对于每个子帧,当施加到短期合成滤波器产生代表语音信号的合成信号时,通过迭代过程来确定兴奋序列,其中对称矩阵Bn逐渐与 每次迭代。 通过用Ln = RnxKn分解图形Bn = LnxRnT,其中Ln和Rn是三角矩阵,Kn是对角矩阵,并且矩阵Ln在其主对角线上只有1s,矩阵Bn被反转。