公开(公告)号：US5553194A

公开(公告)日：1996-09-03

申请号：US951727

申请日：1992-09-25

申请人： Katsushi Seza ,  Hirohisa Tasaki ,  Kunio Nakajima

发明人： Katsushi Seza ,  Hirohisa Tasaki ,  Kunio Nakajima

IPC分类号： G10L19/06 ,  G10L19/08 ,  G10L9/00

CPC分类号： G10L19/08 ,  G10L19/06

摘要： The encoder unit of the vocoder device includes the AR code-book, the MA code-book, and the voice source code-book storing code words each corresponding to a set of the AR, the MA, and the voice source parameters, respectively, which are obtained beforehand by means of the "analysis by synthesis" of a multitude of speech waveform examples and then clustering the resulting respective parameters. The AR preliminary selector, the MA preliminary selector, and the voice source preliminary selector select from respective code-books a predetermined finite number of code words approximating the input speech signal, and in synchronism with the voice source position detected by the voice source position detector the speech synthesizer synthesizes a number of synthesized speech waveforms corresponding to the combinations of the selected AR, MA, and voice source parameters. Comparing the synthesized speech waveforms with the current input speech signal waveform, the optimal code word selector selects the combination of the AR, the MA, and the voice source code words having a minimum distance to the input speech signal waveform.

摘要翻译： 声码器装置的编码器单元包括分别对应于一组AR，MA和语音源参数的AR代码簿，MA代码簿和语音源代码簿，存储代码字， 其通过多个语音波形示例的“综合分析”预先获得，然后对所得到的各个参数进行聚类。 AR初步选择器，MA初步选择器和语音源预选器从相应的代码簿中选择一个预定的有限数量的代码输入语音信号，并与语音源位置检测器检测到的语音源位置同步 语音合成器合成与所选择的AR，MA和语音源参数的组合相对应的多个合成语音波形。 将合成的语音波形与当前输入的语音信号波形进行比较，最佳代码字选择器选择AR，MA和与输入语音信号波形具有最小距离的语音源代码字的组合。

公开(公告)号：US4965580A

公开(公告)日：1990-10-23

申请号：US405350

申请日：1989-09-11

申请人： Hirohisa Tasaki ,  Kunio Nakajima

发明人： Hirohisa Tasaki ,  Kunio Nakajima

IPC分类号： G06T9/00 ,  H03M7/30

CPC分类号： H04N19/94 ,  H03M7/3082

摘要： In a quantizer of the invention, a quantization distortion in the case where the optimum vector code word was used and a quantization distortion in the case where the optimum predictive error vector code word was used, are compared by comparing means, thereby selecting which one of the conventional vector quantization and the predictive error vector quantization should be executed for the present input vector. On the other hand, an inverse-quantizer selects which one of the inverse-quantizations should be executed on the basis of the input code number from the vector code. According to the invention, further, the quantizer and inverse-quantizer have the same analyzing means and converting means and execute the adaptation of the code tables by using the quantization results. Thus, the adaptation of the code table of the quantizer and inverse-quantizer can be accomplished without, particularly, adding the information transmitting process for adaptation. On the other hand, by executing the quantization by selectively using the predictive error vector quantizing means, the accuracy of the quantization result is improved and the adaptation of good code tables is realized.

摘要翻译： 在本发明的量化器中，通过比较装置比较在使用最佳矢量码字的情况下的量化失真和使用最佳预测误差矢量码字的情况下的量化失真，从而选择 应该对当前的输入向量执行传统的矢量量化和预测误差矢量量化。 另一方面，逆量化器根据来自向量代码的输入代码数来选择应该执行哪个逆量化。 根据本发明，量化器和逆量化器具有相同的分析装置和转换装置，并通过使用量化结果来执行代码表的适应。 因此，可以实现量化器和逆量化器的代码表的适配，而不需要特别地添加用于适配的信息发送处理。 另一方面，通过选择性地使用预测误差矢量量化单元执行量化，可以提高量化结果的精度，实现良好代码表的适应。

公开(公告)号：US08724828B2

公开(公告)日：2014-05-13

申请号：US13878621

申请日：2011-01-19

申请人： Satoru Furuta ,  Takashi Sudo ,  Hirohisa Tasaki

发明人： Satoru Furuta ,  Takashi Sudo ,  Hirohisa Tasaki

IPC分类号： H04B15/00

CPC分类号： H04R3/002 ,  G10L21/0232

摘要： A correction spectrum calculation unit 6 obtains a correction spectrum by smoothing an estimated noise spectrum in accordance with the degree of its variations, and a suppression quantity limiting coefficient calculation unit 7 decides a suppression quantity limiting coefficient from the correction spectrum. A suppression quantity calculation unit 9 obtains a suppression coefficient based on the suppression quantity limiting coefficient, and the spectrum suppression unit 10 carries out amplitude suppression of spectral components of an input signal.

摘要翻译： 校正频谱计算单元6通过根据其变化程度对估计的噪声频谱进行平滑来获得校正频谱，抑制量限制系数计算单元7根据校正频谱确定抑制量限制系数。 抑制量计算单元9基于抑制量限制系数获得抑制系数，并且频谱抑制单元10对输入信号的频谱分量进行幅度抑制。

公开(公告)号：US20130003987A1

公开(公告)日：2013-01-03

申请号：US13581544

申请日：2010-03-09

申请人： Satoru Furuta ,  Hirohisa Tasaki

发明人： Satoru Furuta ,  Hirohisa Tasaki

IPC分类号： H04B15/00

CPC分类号： G10L21/0208 ,  G10L21/0232 ,  G10L25/78 ,  G10L2021/02163

摘要： A band separating unit 5 carries out a band division of a plurality of power spectra into which an input signal is converted by a time-to-frequency converting unit 2 to combine power spectra into each subband, and a band representative component generating unit 6 defines a power spectrum having a maximum among the plurality of power spectra within each subband as a representative power spectrum. A noise suppression amount generating unit 7 calculates an amount of noise suppression for each subband by using the representative power spectrum and a noise spectrum, and a noise suppressing unit 9 suppresses the amplitudes of the power spectra according to the amount of noise suppression.

摘要翻译： 频带分离单元5对时频转换单元2对输入信号进行转换的多个功率谱进行频带分割，将功率谱组合成各子带，频带代表分量生成单元6定义 在每个子带内的多个功率谱中具有最大值的功率谱作为代表性功率谱。 噪声抑制量生成单元7通过使用代表性功率谱和噪声频谱来计算每个子带的噪声抑制量，噪声抑制单元9根据噪声抑制量来抑制功率谱的振幅。

公开(公告)号：USRE43209E1

公开(公告)日：2012-02-21

申请号：US12695917

申请日：2010-01-28

申请人： Hirohisa Tasaki ,  Tadashi Yamaura

发明人： Hirohisa Tasaki ,  Tadashi Yamaura

IPC分类号： G10L19/00

摘要： A speech coding apparatus comprises a repetition period pre-selecting unit for generating a plurality of candidates for the repetition period of a driving excitation source by multiplying the repetition period of an adaptive excitation source by a plurality of constant numbers, respectively, and for pre-selecting a predetermined number of candidates from all the candidates generated. A driving excitation source coding unit provides both excitation source location information and excitation source polarity information that minimize a coding distortion, for each of the predetermined number of candidates, and provides an evaluation value associated with the minimum coding distortion for each of the predetermined number of candidates. A repetition period coding unit compares the evaluation values provided for the predetermined number of candidates with one another, selects one candidate from the predetermined number of candidates according to the comparison result, and furnishes selection information indicating the selection result, excitation source location code, and polarity code.

摘要翻译： 语音编码装置包括：重复周期预选单元，用于通过将自适应激励源的重复周期分别乘以多个常数来产生驱动激励源的重复周期的多个候选， 从生成的所有候选中选择预定数量的候选。 驱动激励源编码单元提供激励源位置信息和激励源极性信息，使得对于每个预定数量的候选使编码失真最小化，并且提供与预定数量的候选中的每一个的最小编码失真相关联的评估值 候选人。 重复周期编码单元将针对预定数量的候选者提供的评估值彼此进行比较，根据比较结果从预定数量的候选中选择一个候选，并提供指示选择结果，激励源位置代码和 极性代码。

公开(公告)号：US06643618B2

公开(公告)日：2003-11-04

申请号：US09842095

申请日：2001-04-26

申请人： Bunkei Matsuoka ,  Hirohisa Tasaki

发明人： Bunkei Matsuoka ,  Hirohisa Tasaki

IPC分类号： G10L2102

CPC分类号： G10L19/012 ,  G10L2019/0012

摘要： A speech decoding unit estimates coding parameters of a speech pause by carrying out smoothing algorithm of the coding parameters by using a coding parameter xref constituting far-end talker background noise information extracted by a parameter extracting circuit 12, and a coding parameter xn used for synthesizing the previous background noise.

摘要翻译： 语音解码单元通过使用构成由参数提取电路12提取的远端讲话人背景噪声信息的编码参数xref，以及用于合成的编码参数xn，通过执行编码参数的平滑算法来估计语音暂停的编码参数 以前的背景噪音。

公开(公告)号：US20130216058A1

公开(公告)日：2013-08-22

申请号：US13878621

申请日：2011-01-19

申请人： Satoru Furuta ,  Takashi Sudo ,  Hirohisa Tasaki

发明人： Satoru Furuta ,  Takashi Sudo ,  Hirohisa Tasaki

IPC分类号： H04R3/00

CPC分类号： H04R3/002 ,  G10L21/0232

摘要： A correction spectrum calculation unit 6 obtains a correction spectrum by smoothing an estimated noise spectrum in accordance with the degree of its variations, and a suppression quantity limiting coefficient calculation unit 7 decides a suppression quantity limiting coefficient from the correction spectrum. A suppression quantity calculation unit 9 obtains a suppression coefficient based on the suppression quantity limiting coefficient, and the spectrum suppression unit 10 carries out amplitude suppression of spectral components of an input signal.

摘要翻译： 校正频谱计算单元6通过根据其变化程度对估计的噪声频谱进行平滑来获得校正频谱，抑制量限制系数计算单元7根据校正频谱确定抑制量限制系数。 抑制量计算单元9基于抑制量限制系数获得抑制系数，并且频谱抑制单元10对输入信号的频谱分量进行幅度抑制。

公开(公告)号：US20110123045A1

公开(公告)日：2011-05-26

申请号：US13054589

申请日：2008-11-04

申请人： Hirohisa Tasaki ,  Satoru Furuta

发明人： Hirohisa Tasaki ,  Satoru Furuta

IPC分类号： H04B15/00

CPC分类号： G10L21/0208

摘要： A noise suppressor selects, for individual frequency components, maximums by comparing a plurality of noise suppressed spectra 105 and 106 a plurality of noise suppressing units 4 and 5 output, thereby obtaining an output spectrum 107 having the frequency components selected as its components. A first noise suppressing unit 4 generates a noise suppressed spectrum 105 by multiplying an input spectrum 102 by amplitude suppression gains, and makes the amplitude suppression gains greater than most of the amplitude suppression gains in a noise signal intervals of a second noise suppressing unit 5.

摘要翻译： 噪声抑制器通过比较多个噪声抑制频谱105和106输出多个噪声抑制单元4,5来选择单个频率分量的最大值，从而获得具有选择的频率分量作为其分量的输出频谱107。 第一噪声抑制单元4通过将输入频谱102乘以振幅抑制增益来产生噪声抑制频谱105，并且使得幅度抑制增益大于第二噪声抑制单元5的噪声信号间隔中的大部分幅度抑制增益。

公开(公告)号：US07756699B2

公开(公告)日：2010-07-13

申请号：US11907923

申请日：2007-10-18

申请人： Hirohisa Tasaki

发明人： Hirohisa Tasaki

IPC分类号： G10L19/02 ,  H04J7/00

CPC分类号： H04B1/667 ,  G10L19/167

摘要： A sound encoder multiplexes a plurality of codes into a sound code in an order determined by a multiplexing order determination unit (12), and a sound decoder demultiplexes the sound code into a plurality of codes one by one in an order determined by a demultiplexing order determination unit (14).

摘要翻译： 声音编码器以由多路复用顺序确定单元（12）确定的顺序将多个代码复用到声码中，并且声音解码器按照解复用顺序确定的顺序将声码逐个解复用为多个码 确定单元（14）。

公开(公告)号：US20080281603A1

公开(公告)日：2008-11-13

申请号：US11907917

申请日：2007-10-18

申请人： Hirohisa Tasaki

发明人： Hirohisa Tasaki

IPC分类号： G10L19/00

CPC分类号： H04B1/667 ,  G10L19/167

摘要： A sound encoder multiplexes a plurality of codes into a sound code in an order determined by a multiplexing order determination unit (12), and a sound decoder demultiplexes the sound code into a plurality of codes one by one in an order determined by a demultiplexing order determination unit (14).