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    • 32. 发明授权
    • Speech encoding/decoding apparatus having selected encoders
    • 语音编码/解码器具有选定的编码器
    • US5115469A
    • 1992-05-19
    • US460099
    • 1990-02-08
    • Tomohiko TaniguchiKohei IsedaKoji OkazakiFumio AmanoShigeyuki UnagamiYoshinori TanakaYasuji Ohta
    • Tomohiko TaniguchiKohei IsedaKoji OkazakiFumio AmanoShigeyuki UnagamiYoshinori TanakaYasuji Ohta
    • G10L11/00G10L19/00G10L19/04G10L19/06G10L19/08
    • G10L19/06G10L19/04
    • Several encoders perform a local decoding of a speech signal and extract excitation information and vocal tract information from a speech signal for an encoding operation. The transmission rate ratio between the excitation information and the vocal tract information are different for each encoder. An evaluation/selection unit evaluates the quality of decoded signals subjected to a local decoding in each of the encoders, determines the most suitable encoders from among the several encoders based on the result of the evaluation, and selects the most suitable encoder, thereby outputting the selection result as selection information. The decoder decodes a speech signal based on selection information, vocal tract information and excitation information. The evaluation/selection unit selects the output from the encoder in which the quality of a locally decoded signal is the most preferable. When vocal tract information changes little, the vocal tract information is not output, thereby allowing for increased quality of information. As much of the surplus of unused vocal tract information as possible is assigned to a residual signal. Thus, the quality of a decoded speech signal is improved.
    • PCT No.PCT / JP89 / 00580 Sec。 371日期1990年2月8日 102(e)1990年2月8日PCT PCT 1989年6月7日PCT公布。 出版物WO89 / 12292 日期为1989年12月14日。几个编码器执行语音信号的本地解码,并从用于编码操作的语音信号中提取激励信息和声道信息。 激励信息和声道信息之间的传输速率比对于每个编码器是不同的。 评估/选择单元评估在每个编码器中经过本地解码的解码信号的质量,基于评估结果从多个编码器中确定最合适的编码器,并且选择最合适的编码器,从而输出 选择结果作为选择信息。 解码器基于选择信息,声道信息和激励信息来解码语音信号。 评估/选择单元选择编码器的输出,其中本地解码信号的质量是最优选的。 当声道信息变化较小时,不输出声道信息,从而允许提高信息质量。 尽可能多的未使用的声道信息的剩余被分配给残余信号。 因此,提高了解码语音信号的质量。
    • 38. 发明授权
    • Speech signal coding system wherein non-periodic component feedback to
periodic excitation signal source is adaptively reduced
    • 语音信号编码系统,其中对周期性激励信号源的非周期性分量反馈被自适应地减少
    • US5828811A
    • 1998-10-27
    • US188124
    • 1994-01-28
    • Tomohiko TaniguchiYasuji OhtaYoshinori TanakaHideaki KuriharaYoshihiro Sakai
    • Tomohiko TaniguchiYasuji OhtaYoshinori TanakaHideaki KuriharaYoshihiro Sakai
    • G10L19/00G10L11/06G10L19/12G10L9/14
    • G10L19/12G10L25/93
    • Speech coding uses a periodic excitation signal source, a non-periodic signal excitation source, a synthesizing unit, a filter, and an error evaluating unit. The synthesizing unit synthesizes a periodic excitation signal and a non-periodic excitation signal output from the above-mentioned sources to generate an excitation sound source signal. The filter regenerates an input speech signal from the excitation sound signal. The error evaluating unit controls the periodic excitation signal source and the non-periodic excitation signal source so that the above-mentioned units output periodic and non-periodic excitation signals which minimize a difference of the regenerated signal from an input speech signal. When the error is minimized, the above-mentioned sound source is supplied to a feedback excitation signal modifying unit. The feedback excitation modifying unit reduces a non-periodic component in the above-mentioned supplied signal so that the non-periodic component is reduced more when the relative amount of the periodic component is greater. The modified signal is fed back to the periodic excitation signal source unit to modify the content thereof.
    • 语音编码使用周期性激励信号源,非周期信号激励源,合成单元,滤波器和误差评估单元。 合成单元合成从上述源输出的周期性激励信号和非周期性激励信号,以产生激发声源信号。 滤波器从激励声音信号再生输入语音信号。 误差评估单元控制周期性激励信号源和非周期激励信号源,使得上述单元输出使再生信号与输入语音信号的差异最小化的周期性和非周期性激励信号。 当误差最小化时,将上述声源提供给反馈激励信号修改单元。 反馈激励修正单元在上述提供的信号中减少非周期性分量,使得当周期性分量的相对量较大时,非周期分量更多地减小。 将修改的信号反馈到周期性激励信号源单元以修改其内容。