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.

公开(公告)号：US10469167B2

公开(公告)日：2019-11-05

申请号：US15574319

申请日：2016-04-07

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Naotaka Shibata ,  Shigeru Kuwano ,  Yutaka Kamamoto ,  Takehiro Moriya ,  Jun Terada

IPC分类号： H04B10/00 ,  H04B10/2575 ,  H04L29/06 ,  H04L25/49 ,  H04B10/69

摘要： An optical communication system includes a signal processing apparatus and a wireless apparatus between which functions of a base station are divided, wherein a periodic symbol sequence including a cyclic prefix appended to a signal of a predetermined size to which an IFFT (Inverse Fast Fourier Transform) has been applied is transmitted between the signal processing apparatus and the wireless apparatus by means of digital RoF (Radio over Fiber) transmission, the signal processing apparatus and the wireless apparatus each include a transmission unit and a reception unit, the transmission unit includes: a compression size determination unit that acquires symbol information relating to a starting position of the symbol sequence and lengths of symbols constituting the symbol sequence, and that determines, based on the acquired symbol information, a compression size for each of symbols that are to be compressed; and a compression unit that compresses the symbol sequence in units of determined compression sizes, and the reception unit includes: an expansion size determination unit that determines an expansion size for each of symbols in the symbol sequence that are to be expanded; and an expansion unit that expands the symbol sequence in units of determined expansion sizes.

公开(公告)号：US10163450B2

公开(公告)日：2018-12-25

申请号：US15924887

申请日：2018-03-19

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Yutaka Kamamoto ,  Takehiro Moriya ,  Noboru Harada

IPC分类号： G10L19/06 ,  G10L25/12 ,  G10L25/06 ,  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, a case is comprised where, for at least part of each order i, the coefficient wo(i) corresponding to each order i monotonically decreases as a value having positive correlation with a pitch gain in an input signal of a current frame or a past frame increases.

公开(公告)号：US20180182405A1

公开(公告)日：2018-06-28

申请号：US15904140

申请日：2018-02-23

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takehiro MORIYA ,  Yutaka Kamamoto ,  Noboru Harada ,  Yusuke Hiwasaki ,  Masahiro Fukui

IPC分类号： G10L19/09 ,  G10L25/90 ,  G10L19/00 ,  G10L19/032 ,  G10L19/02 ,  G10L19/08

CPC分类号： G10L19/09 ,  G10L19/0017 ,  G10L19/0212 ,  G10L19/032 ,  G10L19/08 ,  G10L25/90 ,  G10L2025/903 ,  G10L2025/906

摘要： A frequency-domain sample interval corresponding to a time-domain pitch period L corresponding to a time-domain pitch period code of an audio signal in a given time period is obtained as a converted interval T1, a frequency-domain pitch period T is chosen from among candidates including the converted interval T1 and integer multiples U×T1 of the converted interval T1, and a frequency-domain pitch period code indicating how many times the frequency-domain pitch period T is greater than the converted interval T1 is obtained. The frequency-domain pitch period code is output so that a decoding side can identify the frequency-domain pitch period T.

公开(公告)号：US09552821B2

公开(公告)日：2017-01-24

申请号：US14394158

申请日：2013-05-29

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takehiro Moriya ,  Yutaka Kamamoto ,  Noboru Harada ,  Yusuke Hiwasaki ,  Masahiro Fukui

IPC分类号： G10L19/24 ,  G10L19/002 ,  G10L19/032 ,  G10L19/035 ,  G10L19/083

CPC分类号： G10L19/032 ,  G10L19/035 ,  G10L19/083

摘要： A value of gain is updated so that the greater the difference between the number of bits or estimated number of bits in a code obtained by encoding a string of integer value samples obtained by dividing each sample in a sample string derived from an input audio signal in a given interval by gain before the update and a predetermined number B of allocated bits, the greater the difference between the gain before the update and the updated gain. A gain code corresponding to the updated gain and an integer signal code obtained by encoding a string of integer value samples obtained by dividing each sample in the sample string by the gain are obtained.

摘要翻译： 更新增益值，使得通过对从输入音频信号导出的样本串中的每个样本进行分割而获得的整数值样本串进行编码而获得的代码中的位数或估计位数之间的差越大 在更新之前通过增益给定的间隔和分配的比特的预定数量B，更新之前的增益与更新的增益之间的差越大。 获得与更新后的增益相对应的增益代码以及通过将采样串中的每个采样除以增益而获得的整数值样本串进行编码而获得的整数信号码。

公开(公告)号：US11501782B2

公开(公告)日：2022-11-15

申请号：US17044968

申请日：2019-03-04

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Ryosuke Sugiura ,  Yutaka Kamamoto ,  Takehiro Moriya

IPC分类号： G10L19/00

摘要： The present invention aims to encode and decode a sequence of integer values by substantially assigning the number of bits of a decimal fraction value per sample. An integer converter 11 selects M selected integer values from L input integer values for a set of the L input integer values and obtains J-value selection information that specifies which of the L input integer values the M selected integer values are. Furthermore, the integer converter 11 obtains one converted integer value by reversibly converting the M selected integer value and an integer value corresponding to the J-value selection information. An integer encoder 12 encodes the converted integer value to obtain a code.

公开(公告)号：US20220343936A1

公开(公告)日：2022-10-27

申请号：US17856221

申请日：2022-07-01

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Ryosuke SUGIURA ,  Yutaka Kamamoto ,  Takehiro Moriya

IPC分类号： G10L21/0388 ,  G10L19/032

摘要： A decoding apparatus includes: a bandwidth extending part 25 obtaining a decoded extended frequency spectrum sequence by arranging samples based on K samples included in a frequency-domain sample sequence obtained by decoding, on a higher side than the frequency-domain sample sequence; and a fricative sound adjustment releasing part 23 obtaining, if inputted information indicating whether a hissing sound or not indicates being a hissing sound, what is obtained by exchanging all or a part of a low-side frequency sample sequence existing on a lower side than a predetermined frequency in the decoded extended frequency spectrum sequence for all or a part of a high-side frequency sample sequence existing on a higher side than the predetermined frequency in the decoded extended frequency spectrum sequence as an adjusted frequency spectrum sequence, the number of all or the part of the high-side frequency spectrum sequence being the same as the number of all or the part of the low-side frequency spectrum sequence.