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公开(公告)号：US11438009B2
公开(公告)日：2022-09-06
申请号：US17289688
申请日：2019-10-25
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Ryosuke Sugiura , Takehiro Moriya , Yutaka Kamamoto
Abstract: Provided is an encoding/decoding technique according to which it is possible to perform encoding with a small average bit count, even for a series of integer values with a distribution that is significantly biased to a small value, including small values that are not zero values. The present invention includes an integer encoding unit that, for an input series of non-negative values xn, n∈{1, 2, . . . , N} (hereinafter referred to as “integer series”), obtains a one-bit code with a bit value of “x” as a code corresponding to L consecutive integer values 0 included in the integer series, L being an integer that is 2 or more, and obtains a K×xn-bit or a K×xn+1-bit code that includes at least one bit value “x” and at least one bit value “y” in the first bit to the K-th bit and in which the bit values of the K×(xn−1) bits from the end are “y”, as a code corresponding to a set composed of 0 to L−1 consecutive integer values 0 included in the integer series and one integer value xn other than 0.
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公开(公告)号：US11430464B2
公开(公告)日：2022-08-30
申请号：US16962060
申请日：2018-12-03
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Ryosuke Sugiura , Yutaka Kamamoto , Takehiro Moriya
IPC: G10L21/038 , G10L21/0388 , G10L19/032
Abstract: 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.
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公开(公告)号：US11043227B2
公开(公告)日：2021-06-22
申请号：US16782725
申请日：2020-02-05
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Takehiro Moriya , Yutaka Kamamoto , Noboru Harada
Abstract: 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.
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公开(公告)号：US11037579B2
公开(公告)日：2021-06-15
申请号：US16782700
申请日：2020-02-05
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Takehiro Moriya , Yutaka Kamamoto , Noboru Harada
Abstract: 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.
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公开(公告)号：US10909996B2
公开(公告)日：2021-02-02
申请号：US14905158
申请日：2014-07-16
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Yutaka Kamamoto , Takehiro Moriya , Noboru Harada
Abstract: An autocorrelation calculation unit 21 calculates an autocorrelation RO(i) from an input signal. A prediction coefficient calculation unit 23 performs linear prediction analysis by using a modified autocorrelation R′O(i) obtained by multiplying a coefficient wO(i) by the autocorrelation RO(i). It is assumed here, for each order i of some orders i at least, that the coefficient wO(i) corresponding to the order i is in a monotonically increasing relationship with an increase in a value that is negatively correlated with a fundamental frequency of the input signal of the current frame or a past frame.
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Patent Agency Ranking
公开(公告)号：US10529350B2
公开(公告)日：2020-01-07
申请号：US16429590
申请日：2019-06-03
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Takehiro Moriya , Yutaka Kamamoto , Noboru Harada
IPC: G10L19/00 , G10L19/07 , G10L19/06 , G10L19/032 , G10L19/24
Abstract: 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′.
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公开(公告)号：US10418042B2
公开(公告)日：2019-09-17
申请号：US15307059
申请日：2015-03-16
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Takehiro Moriya , Yutaka Kamamoto , Noboru Harada
IPC: G10L19/00 , G10L19/07 , G10L19/038 , G10L19/005
Abstract: 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.
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公开(公告)号：US10381015B2
公开(公告)日：2019-08-13
申请号：US16044678
申请日：2018-07-25
Applicant: Nippon Telegraph and Telephone Corporation
Inventor： Takehiro Moriya , Yutaka Kamamoto , Noboru Harada
IPC: G10L19/00 , G10L19/07 , G10L19/032 , G10L19/06 , G10L19/24
Abstract: 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′.
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公开(公告)号：US10211921B2
公开(公告)日：2019-02-19
申请号：US15572636
申请日：2016-04-06
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Naotaka Shibata , Shigeru Kuwano , Yutaka Kamamoto , Takehiro Moriya , Jun Terada
IPC: H04J14/00 , H04B10/2575 , H03M7/30 , H04J11/00 , H04L27/26
Abstract: 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 first separation unit that acquires symbol information relating to a starting position of the symbol sequence and lengths of symbols constituting the symbol sequence, and that equalizes the lengths of the symbols by separating a portion of the symbol sequence based on the acquired symbol information; and a compression unit that compresses symbols that are to be compressed from which the separated portion of the symbol sequence has been removed, and the reception unit includes an expansion unit that expands the compressed symbols and restores the symbols.
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公开(公告)号：US10204633B2
公开(公告)日：2019-02-12
申请号：US15302205
申请日：2015-02-20
Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor： Takehiro Moriya , Yutaka Kamamoto , Noboru Harada
Abstract: 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.
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