公开(公告)号：US09264094B2

公开(公告)日：2016-02-16

申请号：US14123841

申请日：2012-05-25

申请人： Katsunori Daimou ,  Masahiro Oshikiri ,  Hiroyuki Ehara

发明人： Katsunori Daimou ,  Masahiro Oshikiri ,  Hiroyuki Ehara

IPC分类号： G10L19/00 ,  H04B1/66 ,  G10L19/24 ,  G10L19/02 ,  G10L21/038

CPC分类号： H04B1/667 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/24 ,  G10L21/038

摘要： A voice coding device capable of preventing overall quality degradation even when the bit rate for coding is lowered. The voice coding device codes a wide band signal in a first layer, and codes an extended band signal whose frequency band is located in higher frequency than the wide band signal in an extended band layer. An adaptive band selection unit (301) selects a frequency band to be excluded from a coding object in the extended band layer or a frequency band whose energy is to be attenuated in the extended band layer. A band-limited signal generation unit (302) excludes, within the frequency band of an input signal, the frequency band selected by the adaptive band selection unit (301) from the coding object, or attenuates the energy of the frequency band selected by the adaptive band selection unit (301).

摘要翻译： 即使当编码的比特率降低时，能够防止整体质量劣化的语音编码装置。 语音编码装置对第一层中的宽带信号进行编码，并且对扩展频带信号进行编码，其频带位于比扩频带中的宽带信号更高的频带。 自适应频带选择单元（301）从扩展频带层中的编码对象或能量在扩展频带层中衰减的频带中选择要排除的频带。 频带限制信号生成单元（302）在输入信号的频带内从编码对象排除由自适应频带选择部（301）选择的频带，或者衰减由所述编码对象选择的频带的能量 自适应频带选择单元（301）。

公开(公告)号：US20140122065A1

公开(公告)日：2014-05-01

申请号：US14123841

申请日：2012-05-25

申请人： Katsunori Daimou ,  Masahiro Oshikiri ,  Hiroyuki Ehara

发明人： Katsunori Daimou ,  Masahiro Oshikiri ,  Hiroyuki Ehara

IPC分类号： H04B1/66

CPC分类号： H04B1/667 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/24 ,  G10L21/038

摘要： A voice coding device capable of preventing overall quality degradation even when the bit rate for coding is lowered. The voice coding device codes a wide band signal in a first layer, and codes an extended band signal whose frequency band is located in higher frequency than the wide band signal in an extended band layer. An adaptive band selection unit (301) selects a frequency band to be excluded from a coding object in the extended band layer or a frequency band whose energy is to be attenuated in the extended band layer. A band-limited signal generation unit (302) excludes, within the frequency band of an input signal, the frequency band selected by the adaptive band selection unit (301) from the coding object, or attenuates the energy of the frequency band selected by the adaptive band selection unit (301).

摘要翻译： 即使当编码的比特率降低时，能够防止整体质量劣化的语音编码装置。 语音编码装置对第一层中的宽带信号进行编码，并且对扩展频带信号进行编码，其频带位于比扩频带中的宽带信号更高的频带。 自适应频带选择单元（301）从扩展频带层中的编码对象或能量在扩展频带层中衰减的频带中选择要排除的频带。 频带限制信号生成单元（302）在输入信号的频带内从编码对象排除由自适应频带选择部（301）选择的频带，或者衰减由所述编码对象选择的频带的能量 自适应频带选择单元（301）。

公开(公告)号：US20110307248A1

公开(公告)日：2011-12-15

申请号：US13203122

申请日：2010-02-25

申请人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Hiroyuki Ehara

发明人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Hiroyuki Ehara

IPC分类号： H04L27/00 ,  G10L21/00

CPC分类号： G10L19/0204 ,  G10L21/038

摘要： Provided is an encoder which can effectively encode/decode spectrum data of a broad frequency signal in a high frequency range, can dramatically reduce the number of the arithmetic operations to be performed, and can improve the quality of the decoded signal. The encoder comprises a first layer coding unit (202) which encodes an input signal in a low frequency range below a predetermined frequency to generate first coded information, a first layer decoding unit (203) which decodes the first coded information to generate a decoded signal, and a second layer coding unit (206) which splits the input signal in a high frequency range above a predetermined frequency, into a plurality of sub-bands, presumes the respective sub-hands from the input signal or decoded signal, partially selects a spectrum component within each sub-band, and calculates an amplitude adjustment parameter used to adjust the amplitude of the selected spectrum component to thereby generate second coding information.

摘要翻译： 提供了能够在高频范围内有效地编码/解码宽频信号的频谱数据的编码器，可以显着地减少要执行的算术运算的数量，并且可以提高解码信号的质量。 编码器包括对低于预定频率的低频范围内的输入信号进行编码以产生第一编码信息的第一层编码单元（202），对第一编码信息进行解码以产生解码信号的第一层解码单元（203） ，以及将高于预定频率的高频范围内的输入信号分割成多个子带的第二层编码单元（206），从输入信号或解码信号中假设相应的副手，部分地选择 并且计算用于调整所选择的频谱分量的振幅的幅度调整参数，从而生成第二编码信息。

公开(公告)号：US07983904B2

公开(公告)日：2011-07-19

申请号：US11718437

申请日：2005-11-02

申请人： Hiroyuki Ehara ,  Masahiro Oshikiri ,  Koji Yoshida

发明人： Hiroyuki Ehara ,  Masahiro Oshikiri ,  Koji Yoshida

IPC分类号： G10L19/14

CPC分类号： G10L21/038 ,  G10L19/24

摘要： A scalable decoding apparatus capable of providing decoded audio signals of high quality having less degradation of a high frequency spectrum even when decoding audio signals by generating the high frequency spectrum by use of a low frequency spectrum. In the apparatus, an amplitude adjusting part uses different adjustment coefficients in accordance with the characteristic of first layer spectrum information to adjust the amplitude of a first layer decoded signal spectrum, and then outputs the amplitude-adjusted first layer decoded signal spectrum to a pseudo-spectrum generating part. Using amplitude-adjusted first layer decoded signal spectrum received from the amplitude adjusting part, the pseudo-spectrum generating part generates and outputs a pseudo-spectrum of high frequencies to a scaling part. The scaling part scales the spectrum received from the pseudo-spectrum generating part and then outputs it to an adder.

摘要翻译： 即使在通过使用低频谱生成高频谱来解码音频信号的同时，也能够提供具有较低的高频谱劣化的高质量解码音频信号的可扩展解码装置。 在该装置中，振幅调整部根据第一层频谱信息的特性，使用不同的调整系数来调整第一层解码信号频谱的振幅，然后将调幅后的第一层解码信号频谱输出到伪 - 频谱产生部分。 使用从振幅调整部接收到的经调幅的第一层解码信号频谱，伪频谱生成部生成并输出高频的伪频谱到缩放部。 缩放部分缩放从伪频谱生成部分接收到的频谱，然后将其输出到加法器。

公开(公告)号：US07904292B2

公开(公告)日：2011-03-08

申请号：US11576264

申请日：2005-09-28

申请人： Michiyo Goto ,  Koji Yoshida ,  Hiroyuki Ehara ,  Masahiro Oshikiri

发明人： Michiyo Goto ,  Koji Yoshida ,  Hiroyuki Ehara ,  Masahiro Oshikiri

IPC分类号： G10L19/12 ,  G10L19/00

CPC分类号： G10L19/008 ,  G10L19/24

摘要： A scalable encoding device for realizing scalable encoding by CELP encoding of a stereo sound signal and improving the encoding efficiency. In this device, an adder and a multiplier obtain an average of a first channel signal CH1 and a second channel signal CH2 as a monaural signal M. A CELP encoder for a monaural signal subjects the monaural signal M to CELP encoding, outputs the obtained encoded parameter to outside, and outputs a synthesized monaural signal M′ synthesized by using the encoded parameter to a first channel signal encoder. By using the synthesized monaural signal M′ and the second channel signal CH2, the first channel signal encoder subjects the first channel signal CH1 to CELP encoding to minimize the sum of the encoding distortion of the first channel signal CH1 and the encoding distortion of the second channel signal CH2.

摘要翻译： 一种可扩展编码装置，用于通过立体声信号的CELP编码实现可分级编码，并提高编码效率。 在该装置中，加法器和乘法器获得第一信道信号CH1和第二信道信号CH2的平均值作为单声道信号M.用于单声道信号的CELP编码器对单声道信号M进行CELP编码，将获得的编码 参数到外部，并且将通过使用编码参数合成的合成单声道信号M'输出到第一声道信号编码器。 通过使用合成单声道信号M'和第二声道信号CH2，第一声道信号编码器使第一声道信号CH1至CELP编码器使第一声道信号CH1的编码失真和第二声道信号CH1的编码失真之和最小化 通道信号CH2。

公开(公告)号：US20080255833A1

公开(公告)日：2008-10-16

申请号：US11576264

申请日：2005-09-28

申请人： Michiyo Goto ,  Koji Yoshida ,  Hiroyuki Ehara ,  Masahiro Oshikiri

发明人： Michiyo Goto ,  Koji Yoshida ,  Hiroyuki Ehara ,  Masahiro Oshikiri

IPC分类号： G10L19/12

CPC分类号： G10L19/008 ,  G10L19/24

摘要： A scalable encoding device for realizing scalable encoding by CELP encoding of a stereo sound signal and improving the encoding efficiency. In this device, an adder and a multiplier obtain an average of a first channel signal CH1 and a second channel signal CH2 as a monaural signal M. A CELP encoder for a monaural signal subjects the monaural signal M to CELP encoding, outputs the obtained encoded parameter to outside, and outputs a synthesized monaural signal M′ synthesized by using the encoded parameter to a first channel signal encoder. By using the synthesized monaural signal M′ and the second channel signal CH2, the first channel signal encoder subjects the first channel signal CH1 to CELP encoding to minimize the sum of the encoding distortion of the first channel signal CH1 and the encoding distortion of the second channel signal CH2.

摘要翻译： 一种可扩展编码装置，用于通过立体声信号的CELP编码实现可分级编码，并提高编码效率。 在该装置中，加法器和乘法器获得第一信道信号CH 1和第二信道CH 2的平均值作为单声道信号M.用于单声道信号的CELP编码器使单声道信号M进行CELP编码， 获得编码参数到外部，并且将通过使用编码参数合成的合成单声道信号M'输出到第一声道信号编码器。 通过使用合成单声道信号M'和第二声道信号CH 2，第一声道信号编码器对第一声道信号CH 1进行CELP编码，使第一声道信号CH 1的编码失真和编码失真的和最小化 的第二信道信号CH 2。

公开(公告)号：US20080126082A1

公开(公告)日：2008-05-29

申请号：US11718437

申请日：2005-11-02

申请人： Hiroyuki Ehara ,  Masahiro Oshikiri ,  Koji Yoshida

发明人： Hiroyuki Ehara ,  Masahiro Oshikiri ,  Koji Yoshida

IPC分类号： G10L19/00

CPC分类号： G10L21/038 ,  G10L19/24

摘要： A scalable decoding apparatus capable of providing decoded audio signals of high quality having less degradation of a high frequency spectrum even when decoding audio signals by generating the high frequency spectrum by use of a low frequency spectrum. In the apparatus, an amplitude adjusting part (1211) uses different adjustment coefficients in accordance with the characteristic of first layer spectrum information to adjust the amplitude of a first layer decoded signal spectrum, and then outputs the amplitude-adjusted first layer decoded signal spectrum to a pseudo-spectrum generating part (1012). Using amplitude-adjusted first layer decoded signal spectrum received from the amplitude adjusting part (1211), the pseudo-spectrum generating part (1012) generates and outputs a pseudo-spectrum of high frequencies to a scaling part (1013). The scaling part (1013) scales the spectrum received from the pseudo-spectrum generating part (1012) and then outputs it to an adder (B).

摘要翻译： 即使在通过使用低频谱生成高频谱来解码音频信号的同时，也能够提供具有较低的高频谱劣化的高质量解码音频信号的可扩展解码装置。 在该装置中，振幅调整部（1211）根据第一层频谱信息的特性使用不同的调整系数来调整第一层解码信号频谱的振幅，然后将经调幅的第一层解码信号频谱输出到 伪频谱生成部（1012）。 使用从振幅调整部（1211）接收到的经调幅的第一层解码信号频谱，伪频谱生成部（1012）生成并将高频的伪频谱输出到缩放部（1013）。 缩放部分（1013）缩放从伪频谱生成部分（1012）接收的频谱，然后将其输出到加法器（B）。

公开(公告)号：US20110137643A1

公开(公告)日：2011-06-09

申请号：US13057454

申请日：2009-08-07

申请人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Toshiyuki Morii ,  Hiroyuki Ehara

发明人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Toshiyuki Morii ,  Hiroyuki Ehara

IPC分类号： G10L19/02

CPC分类号： G10L19/0204 ,  G10L19/0212 ,  G10L19/032 ,  G10L19/24 ,  G10L21/02

摘要： Disclosed is a spectral smoothing device with a structure whereby smoothing is performed after a nonlinear conversion has been performed for a spectrum calculated from an audio signal, and with which the amount of processing calculation is significantly reduced while maintaining excellent audio quality. With this spectral smoothing device, a sub band division unit (102) divides an input spectrum into multiple sub bands; a representative value calculation unit (103) calculates a representative value for each sub band using an arithmetic mean and a geometric mean; with respect to each representative value, a nonlinear conversion unit (104) performs a nonlinear conversion the characteristic of which is further emphasized as the value increases; and a smoothing unit (105) that smoothes the representative value which has undergone the nonlinear conversion for each sub band, at the frequency domain.

摘要翻译： 公开了一种光谱平滑装置，其具有在对从音频信号计算出的频谱进行非线性转换之后进行平滑处理，并且在保持优良音频质量的同时显着减少处理计算量的结构。 利用该频谱平滑装置，子带分割单元（102）将输入频谱划分成多个子频带; 代表值计算单元（103）使用算术平均值和几何平均值计算每个子带的代表值; 对于每个代表值，非线性转换单元（104）执行非线性转换，其特性随着值的增加被进一步强调; 以及平滑化单元（105），其以频域对每个子带进行了非线性转换的代表值进行平滑化。

公开(公告)号：US08731909B2

公开(公告)日：2014-05-20

申请号：US13057454

申请日：2009-08-07

申请人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Toshiyuki Morii ,  Hiroyuki Ehara

发明人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Toshiyuki Morii ,  Hiroyuki Ehara

IPC分类号： G10L19/02 ,  G10L19/14 ,  G10L19/00

CPC分类号： G10L19/0204 ,  G10L19/0212 ,  G10L19/032 ,  G10L19/24 ,  G10L21/02

摘要： Disclosed is a spectral smoothing device with a structure whereby smoothing is performed after a nonlinear conversion has been performed for a spectrum calculated from an audio signal, and with which the amount of processing calculation is significantly reduced while maintaining excellent audio quality. With this spectral smoothing device, a sub band division unit (102) divides an input spectrum into multiple sub bands; a representative value calculation unit (103) calculates a representative value for each sub band using an arithmetic mean and a geometric mean; with respect to each representative value, a nonlinear conversion unit (104) performs a nonlinear conversion the characteristic of which is further emphasized as the value increases; and a smoothing unit (105) that smoothes the representative value which has undergone the nonlinear conversion for each sub band, at the frequency domain.

摘要翻译： 公开了一种光谱平滑装置，其具有在对从音频信号计算出的频谱进行非线性转换之后进行平滑处理，并且在保持优良音频质量的同时显着减少处理计算量的结构。 利用该频谱平滑装置，子带分割单元（102）将输入频谱划分成多个子频带; 代表值计算单元（103）使用算术平均值和几何平均值计算每个子带的代表值; 对于每个代表值，非线性转换单元（104）执行非线性转换，其特性随着值的增加被进一步强调; 以及平滑化单元（105），其以频域对每个子带进行了非线性转换的代表值进行平滑化。

公开(公告)号：US08660851B2

公开(公告)日：2014-02-25

申请号：US13322202

申请日：2010-05-25

申请人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Hiroyuki Ehara

发明人： Tomofumi Yamanashi ,  Masahiro Oshikiri ,  Hiroyuki Ehara

IPC分类号： G10L19/008

CPC分类号： G10L19/005 ,  G10L19/008

摘要： A decoding device reduces abrupt changes in the number of channels in a decoded signal when transmission errors occur as a result of lost frames in an encoding/decoding system for multichannel signals. In the device, a demultiplexer receives an encoded monaural signal and an encoded differential signal and detects change over time in the received encoded differential signal. An M signal decoder decodes the encoded monaural signal and obtains a decoded monaural signal. An S signal decoder decodes the encoded differential signal and obtains a decoded differential signal. A smoothing unit performs smoothing on the decoded differential signal by means of a computation involving the decoded differential signal and coefficients corresponding to the change over time detected by the demultiplexer. An L/R signal computation unit computes a decoded stereo signal from the decoded monaural signal and the smoothed decoded differential signal.

摘要翻译： 由于多通道信号的编码/解码系统中的丢失帧的结果，当传输错误发生时，解码装置减少解码信号中的信道数量的突然变化。 在该装置中，解复用器接收经编码的单声道信号和经编码的差分信号，并检测接收到的编码差分信号中随时间的变化。 M信号解码器解码编码的单声道信号并获得解码的单声道信号。 S信号解码器对编码的差分信号进行解码并获得解码的差分信号。 平滑单元通过涉及解码的差分信号的计算和对应于由解复用器检测到的随时间变化的系数对解码的差分信号进行平滑处理。 L / R信号计算单元从解码的单声道信号和平滑的解码的差分信号计算解码的立体声信号。