公开(公告)号：US10199046B2

公开(公告)日：2019-02-05

申请号：US15304733

申请日：2015-02-20

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takehiro Moriya ,  Yutaka Kamamoto ,  Noboru Harada

IPC分类号： G10L19/04 ,  G10L25/90 ,  G10L19/02 ,  G10L19/06 ,  H03M7/40 ,  G10L19/12

摘要： An encoder includes a periodic-combined-envelope generating part and a variable-length coding part. The periodic-combined-envelope generating part generates a periodic combined envelope sequence which is a frequency-domain sequence based on a spectral envelope sequence which is a frequency-domain sequence corresponding to a linear predictive coefficient code obtained from an input audio signal and on a frequency-domain period. The variable-length coding part encodes a frequency-domain sequence derived from the input audio signal. A decoder includes a periodic-combined-envelope generating part and a variable-length decoding part. The periodic-combined-envelope generating part generates a periodic combined envelope sequence which is a frequency-domain sequence based on a spectral envelope sequence which is a frequency-domain sequence corresponding to a linear predictive coefficient code and on a frequency-domain period. The variable-length decoding part decodes a variable-length code to obtain a frequency-domain sequence.

公开(公告)号：US10134420B2

公开(公告)日：2018-11-20

申请号：US15889775

申请日：2018-02-06

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Yutaka Kamamoto ,  Takehiro Moriya ,  Noboru Harada

IPC分类号： G10L25/12 ,  G10L25/06 ,  G10L19/06 ,  G10L25/90 ,  G10L25/21

摘要： An autocorrelation calculating part calculates autocorrelation Ro(i) from an input signal. A predictive coefficient calculating part performs linear predictive analysis using modified autocorrelation R′o(i) obtained by multiplying the autocorrelation Ro(i) by a coefficient wo(i). Here, it is assumed that a case where, for at least part of each order i, the coefficient wo(i) corresponding to each order i monotonically increases as a value having negative correlation with a fundamental frequency of an input signal in a current frame or a past frame increases and a case where the coefficient wo(i) monotonically decreases as a value having positive correlation with a pitch gain in a current frame or a past frame increases, are included.

公开(公告)号：US10115413B2

公开(公告)日：2018-10-30

申请号：US15889748

申请日：2018-02-06

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Yutaka Kamamoto ,  Takehiro Moriya ,  Noboru Harada

IPC分类号： G10L19/00 ,  G10L21/00 ,  G10L25/12 ,  G10L25/06 ,  G10L19/06 ,  G10L25/90 ,  G10L25/21

摘要： An autocorrelation calculating part calculates autocorrelation Ro(i) from an input signal. A predictive coefficient calculating part performs linear predictive analysis using modified autocorrelation R′o(i) obtained by multiplying the autocorrelation Ro(i) by a coefficient wo(i). Here, it is assumed that a case where, for at least part of each order i, the coefficient wo(i) corresponding to each order i monotonically increases as a value having negative correlation with a fundamental frequency of an input signal in a current frame or a past frame increases and a case where the coefficient wo(i) monotonically decreases as a value having positive correlation with a pitch gain in a current frame or a past frame increases, are included.

公开(公告)号：US09911427B2

公开(公告)日：2018-03-06

申请号：US15126437

申请日：2015-01-13

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takehiro Moriya ,  Yutaka Kamamoto ,  Noboru Harada

IPC分类号： G10L19/20 ,  G10L19/002 ,  G10L19/032

CPC分类号： G10L19/20 ,  G10L19/002 ,  G10L19/02 ,  G10L19/032 ,  G10L19/035

摘要： In an encoding method that is expected to produce a smaller code amount out of a periodicity-based encoding method and a non-periodicity-based encoding method, the amount of code or an estimated value of the amount of code of an integer value sequence which is derived from an audio signal is obtained while adjusting gain. In the other encoding method, an integer value sequence obtained in this process is substituted to obtain the amount of code or an estimated value of the amount of code of the integer value sequence. The obtained code amounts or estimated values are compared to choose one of the encoding methods and the integer value sequence is encoded using the chosen encoding method to obtain and output an integer signal code.

公开(公告)号：US08997043B2

公开(公告)日：2015-03-31

申请号：US13681090

申请日：2012-11-19

申请人： Nippon Telegraph and Telephone Corporation

发明人： Noboru Harada ,  Takehiro Moriya ,  Yutaka Kamamoto

IPC分类号： G06F9/44 ,  G06Q30/00 ,  G06F11/00 ,  G06F17/30

CPC分类号： G06F17/30076 ,  G06F17/30123

摘要： In encoding for putting one or more files and/or one or more files in a folder into a single archive file, original hierarchy information and standard hierarchy information generated by converting characters in a special character coding in each file name to characters in a standard character coding are recorded in the archive file. If the character coding used in the original hierarchy information in the archive file cannot be used in the system environment used in decoding, a file name in the standard character coding is generated from the standard hierarchy information and is converted to a character coding that can be used in the system environment.

摘要翻译： 在将文件夹中的一个或多个文件和/或一个或多个文件放入单个归档文件的编码中，通过将每个文件名中的特殊字符编码中的字符转换为标准字符中的字符而生成的原始层级信息和标准层级信息 编码被记录在归档文件中。 如果归档文件中的原始层级信息中使用的字符编码不能在解码中使用的系统环境中使用，则从标准层级信息生成标准字符编码中的文件名，并将其转换成可以是 用于系统环境。

公开(公告)号：US11694702B2

公开(公告)日：2023-07-04

申请号：US17370060

申请日：2021-07-08

申请人： Nippon Telegraph and Telephone Corporation

发明人： Takehiro Moriya ,  Yutaka Kamamoto ,  Noboru Harada

IPC分类号： G10L19/00 ,  G10L21/00 ,  G10L19/07 ,  G10L19/038 ,  G10L19/005

CPC分类号： G10L19/07 ,  G10L19/038 ,  G10L19/005 ,  G10L2019/0016

摘要： A coding method and a decoding method are provided which can use in combination a predictive coding and decoding method which is a coding and decoding method that can accurately express coefficients which are convertible into linear prediction coefficients with a small code amount and a coding and decoding method that can obtain correctly, by decoding, coefficients which are convertible into linear prediction coefficients of the present frame if a linear prediction coefficient code of the present frame is correctly input to a decoding device. A coding device includes: a predictive coding unit that obtains a first code by coding a differential vector formed of differentials between a vector of coefficients which are convertible into linear prediction coefficients of more than one order of the present frame and a prediction vector containing at least a predicted vector from a past frame, and obtains a quantization differential vector corresponding to the first code; and a non-predictive coding unit that generates a second code by coding a correction vector which is formed of differentials between the vector of the coefficients which are convertible into the linear prediction coefficients of more than one order of the present frame and the quantization differential vector or formed of some of elements of the differentials.

公开(公告)号：US11100938B2

公开(公告)日：2021-08-24

申请号：US15931694

申请日：2020-05-14

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takehiro Moriya ,  Yutaka Kamamoto ,  Noboru Harada

IPC分类号： G10L19/06 ,  G10L19/12 ,  G10L19/02

摘要： An envelope sequence is provided that can improve approximation accuracy near peaks caused by the pitch period of an audio signal. A periodic-combined-envelope-sequence generation device according to the present invention takes, as an input audio signal, a time-domain audio digital signal in each frame, which is a predetermined time segment, and generates a periodic combined envelope sequence as an envelope sequence. The periodic-combined-envelope-sequence generation device according to the present invention comprises at least a spectral-envelope-sequence calculating part and a periodic-combined-envelope generating part. The spectral-envelope-sequence calculating part calculates a spectral envelope sequence of the input audio signal on the basis of time-domain linear prediction of the input audio signal. The periodic-combined-envelope generating part transforms an amplitude spectral envelope sequence to a periodic combined envelope sequence on the basis of a periodic component of the input audio signal in the frequency domain.

公开(公告)号：US10811021B2

公开(公告)日：2020-10-20

申请号：US16691764

申请日：2019-11-22

申请人： Nippon Telegraph and Telephone Corporation

发明人： Takehiro Moriya ,  Yutaka Kamamoto ,  Noboru Harada

IPC分类号： G10L19/00 ,  G10L19/07 ,  G10L19/06 ,  G10L19/032 ,  G10L19/24

摘要： A technology of accurately coding and decoding coefficients which are convertible into linear prediction coefficients even for a frame in which the spectrum variation is great while suppressing an increase in the code amount as a whole is provided. A coding device includes: a first coding unit that obtains a first code by coding coefficients which are convertible into linear prediction coefficients of more than one order; and a second coding unit that obtains a second code by coding at least quantization errors of the first coding unit if (A−1) an index Q commensurate with how high the peak-to-valley height of a spectral envelope is, the spectral envelope corresponding to the coefficients which are convertible into the linear prediction coefficients of more than one order, is larger than or equal to a predetermined threshold value Th1 and/or (B−1) an index Q′ commensurate with how short the peak-to-valley height of the spectral envelope is, is smaller than or equal to a predetermined threshold value Th1′.

公开(公告)号：US10734009B2

公开(公告)日：2020-08-04

申请号：US16228980

申请日：2018-12-21

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takehiro Moriya ,  Yutaka Kamamoto ,  Noboru Harada

IPC分类号： G10L19/06 ,  G10L19/12 ,  G10L19/02

摘要： An envelope sequence is provided that can improve approximation accuracy near peaks caused by the pitch period of an audio signal. A periodic-combined-envelope-sequence generation device according to the present invention takes, as an input audio signal, a time-domain audio digital signal in each frame, which is a predetermined time segment, and generates a periodic combined envelope sequence as an envelope sequence. The periodic-combined-envelope-sequence generation device according to the present invention comprises at least a spectral-envelope-sequence calculating part and a periodic-combined-envelope generating part. The spectral-envelope-sequence calculating part calculates a spectral envelope sequence of the input audio signal on the basis of time-domain linear prediction of the input audio signal. The periodic-combined-envelope generating part transforms an amplitude spectral envelope sequence to a periodic combined envelope sequence on the basis of a periodic component of the input audio signal in the frequency domain.

公开(公告)号：US20200176007A1

公开(公告)日：2020-06-04

申请号：US16782725

申请日：2020-02-05

申请人： Nippon Telegraph and Telephone Corporation

发明人： Takehiro MORIYA ,  Yutaka Kamamoto ,  Noboru Harada

IPC分类号： G10L19/22 ,  H03M7/30 ,  G10L19/20

摘要： A coding technology that efficiently codes an input sound signal irrespective of the characteristics thereof and can obtain a decoded sound signal that sounds less artificial to a listener. A coding method codes an input sound signal frame by frame of a predetermined time segment by a selected coding processing from a plurality of types of coding processing in the frequency domain, the coding method makes it possible for a selection unit to select coding processing which is different from the coding processing of the preceding frame as coding processing of the present frame if at least one of the magnitude of the energy of high frequency components of the input sound signal of the preceding frame and the magnitude of the energy of high frequency components of the input sound signal of the present frame is smaller than or equal to a predetermined threshold value.