Patents by Inventor Takehiro Moriya

Takehiro Moriya has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11120809
    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.
    Type: Grant
    Filed: July 31, 2019
    Date of Patent: September 14, 2021
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takehiro Moriya, Yutaka Kamamoto, Noboru Harada
  • Patent number: 11100938
    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.
    Type: Grant
    Filed: May 14, 2020
    Date of Patent: August 24, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takehiro Moriya, Yutaka Kamamoto, Noboru Harada
  • Patent number: 11087774
    Abstract: A log spectral envelope sequence L0, L1, . . . , LN?1 and an envelope code for the log spectral envelope sequence L0, L1, . . . , LN?1 are obtained. The log spectral envelope sequence L0, L1, . . . , LN?1 is an integer value sequence corresponding to binary logarithms of respective sample values of a spectral envelope sequence and is an integer value sequence whose total sum is 0. For a quantized spectral sequence {circumflex over (?)}X0, {circumflex over (?)}X1, . . . , {circumflex over (?)}XN?1, a smoothed spectral sequence ˜X0, ˜X1, . . . , ˜XN?1 is obtained by: for {circumflex over (?)}Xk with Lk being a positive value, adopting {circumflex over (?)}Xk with Lk digits from its least significant digit removed as ˜Xk; for {circumflex over (?)}Xk with Lk being a negative value, adopting {circumflex over (?)}Xk with ?Lk digits added to its least significant digit in accordance with a predefined rule as ˜Xk; and when Lk is 0, adopting {circumflex over (?)}Xk as ˜Xk.
    Type: Grant
    Filed: April 24, 2018
    Date of Patent: August 10, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke Sugiura, Yutaka Kamamoto, Takehiro Moriya
  • Publication number: 20210233549
    Abstract: As pitch enhancement processing, a pitch enhancement apparatus obtains, for a time segment judged to be a time segment including a signal that is a consonant, for each time of the time segment, as an output signal, a signal including a signal obtained by adding a signal, which was obtained by multiplying a signal at a time that is an earlier time than the time by the number of samples T0 corresponding to a pitch period of the time segment, the pitch gain ?0 of the time segment, a predetermined constant B0, and a value that is greater than 0 and less than 1, and a signal at the time.
    Type: Application
    Filed: March 22, 2019
    Publication date: July 29, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yutaka KAMAMOTO, Ryosuke SUGIURA, Takehiro MORIYA
  • Patent number: 11074919
    Abstract: In encoding, a frequency-domain sample sequence derived from an acoustic signal is divided by a weighted envelope and is then divided by a gain, the result obtained is quantized, and each sample is variable-length encoded. The error between the sample before quantization and the sample after quantization is quantized with information saved in this variable-length encoding. This quantization is performed under a rule that specifies, according to the number of saved bits, samples whose errors are to be quantized. In decoding, variable-length codes in an input sequence of codes are decoded to obtain a frequency-domain sample sequence; an error signal is further decoded under a rule that depends on the number of bits of the variable-length codes; and from the obtained sample sequence, the original sample sequence is obtained according to supplementary information.
    Type: Grant
    Filed: November 18, 2019
    Date of Patent: July 27, 2021
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takehiro Moriya, Noboru Harada, Yutaka Kamamoto, Yusuke Hiwasaki, Masahiro Fukui
  • Patent number: 11043227
    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.
    Type: Grant
    Filed: February 5, 2020
    Date of Patent: June 22, 2021
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takehiro Moriya, Yutaka Kamamoto, Noboru Harada
  • Patent number: 11037579
    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.
    Type: Grant
    Filed: February 5, 2020
    Date of Patent: June 15, 2021
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takehiro Moriya, Yutaka Kamamoto, Noboru Harada
  • Publication number: 20210166700
    Abstract: 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.
    Type: Application
    Filed: March 4, 2019
    Publication date: June 3, 2021
    Applicant: Nippon Telegraph and Telephone Corporation
    Inventors: Ryosuke SUGIURA, Yutaka KAMAMOTO, Takehiro MORIYA
  • Patent number: 11024319
    Abstract: In encoding, a frequency-domain sample sequence derived from an acoustic signal is divided by a weighted envelope and is then divided by a gain, the result obtained is quantized, and each sample is variable-length encoded. The error between the sample before quantization and the sample after quantization is quantized with information saved in this variable-length encoding. This quantization is performed under a rule that specifies, according to the number of saved bits, samples whose errors are to be quantized. In decoding, variable-length codes in an input sequence of codes are decoded to obtain a frequency-domain sample sequence; an error signal is further decoded under a rule that depends on the number of bits of the variable-length codes; and from the obtained sample sequence, the original sample sequence is obtained according to supplementary information.
    Type: Grant
    Filed: November 18, 2019
    Date of Patent: June 1, 2021
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takehiro Moriya, Noboru Harada, Yutaka Kamamoto, Yusuke Hiwasaki, Masahiro Fukui
  • Publication number: 20210098009
    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.
    Type: Application
    Filed: December 14, 2020
    Publication date: April 1, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yutaka Kamamoto, Takehiro Moriya, Noboru Harada
  • Publication number: 20210090587
    Abstract: Provided is pitch enhancement processing having little unnaturalness even in time segments for consonants, and having little unnaturalness to listeners caused by discontinuities even when time segments for consonants and other time segments switch frequently. A pitch emphasis apparatus carries out the following as the pitch enhancement processing: for a time segment in which a spectral envelope of a signal has been determined to be flat, obtaining an output signal for each of times in the time segment, the output signal being a signal including a signal obtained by adding (1) a signal obtained by multiplying the signal of a time, further in the past than the time by a number of samples T0 corresponding to a pitch period of the time segment, a pitch gain ?0 of the time segment, a predetermined constant B0, and a value greater than 0 and less than 1, to (2) the signal of the time.
    Type: Application
    Filed: April 23, 2019
    Publication date: March 25, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yutaka KAMAMOTO, Ryosuke SUGIURA, Takehiro MORIYA
  • Publication number: 20210090586
    Abstract: Provided is pitch enhancement processing having little unnaturalness even in time segments for consonants, and having little unnaturalness to listeners caused by discontinuities even when time segments for consonants and other time segments switch frequently. A pitch emphasis apparatus obtains an output signal by executing pitch enhancement processing on each of time segments of a signal originating from an input audio signal.
    Type: Application
    Filed: April 23, 2019
    Publication date: March 25, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yutaka KAMAMOTO, Ryosuke SUGIURA, Takehiro MORIYA
  • Patent number: 10909996
    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.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: February 2, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yutaka Kamamoto, Takehiro Moriya, Noboru Harada
  • Publication number: 20200411016
    Abstract: An encoding apparatus comprising an encoding part 14 performing encoding by an encoding process in which bits are preferentially assigned to a low side to obtain a spectrum code, the encoding apparatus further comprising: a fricative sound judging part 12 judging whether a sound signal is a hissing sound or not; and a fricative sound adjusting part 13 obtaining, if the fricative sound judging part 12 judges that the sound signal is a hissing sound, what is obtained by exchanging all or a part of a low-side frequency spectrum sequence existing on a lower side than a predetermined frequency in a frequency spectrum sequence of the sound signal for all or a part of a high-side frequency spectrum sequence existing on a higher side of the predetermined frequency in the 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; wherein t
    Type: Application
    Filed: December 3, 2018
    Publication date: December 31, 2020
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Yutaka KAMAMOTO, Takehiro MORIYA
  • Publication number: 20200402524
    Abstract: Efficient assignment of bit numbers is performed even under a low bit rate condition. A quantizer 12 obtains a quantized spectral sequence from a frequency spectral sequence. An integer transformer 13 obtains a unified quantized spectral sequence by obtaining, by a bijective transformation, a transformed integer for each of the sets, each being made up of integer values, obtained from the quantized spectral sequence. An integer encoder 15 obtains an integer code by encoding the unified quantized spectral sequence using a bit assignment sequence. An object-to-be-encoded estimator 18 obtains an estimated unified spectral sequence from the frequency spectral sequence by a transformation which is performed by the integer transformer 13 or a transformation that approximates the magnitude relationship between values before and after the above transformation. A bit assigner 14 obtains a bit assignment sequence and a bit assignment code from the estimated unified spectral sequence.
    Type: Application
    Filed: February 19, 2019
    Publication date: December 24, 2020
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Yutaka KAMAMOTO, Takehiro MORIYA
  • Publication number: 20200395034
    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.
    Type: Application
    Filed: December 3, 2018
    Publication date: December 17, 2020
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Yutaka KAMAMOTO, Takehiro MORIYA
  • Publication number: 20200388301
    Abstract: A pitch enhancement apparatus obtains an output signal by performing, for each time segment, pitch enhancement processing on a signal derived from an input audio signal. The pitch enhancement apparatus includes a pitch enhancement unit that performs, as the pitch enhancement processing, for each time segment, processing to obtain, as an output signal at each time of the time segment, a signal including the signal at the time, a first signal for enhancement that is the signal at a time which is an earlier time than the time by the number of samples T0 corresponding to a pitch period of the time segment, and a second signal for enhancement that is the signal at a time which is an earlier time than the time by the number of samples T?? corresponding to a pitch period of the ?-th time segment previous to the time segment.
    Type: Application
    Filed: October 29, 2018
    Publication date: December 10, 2020
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Yutaka KAMAMOTO, Takehiro MORIYA
  • Patent number: 10840944
    Abstract: An encoding/decoding technique is provided with which encoding can be performed using a small average number of bits even for a sequence of integer values including small non-zero values and having a distribution heavily biased toward small values. The present invention includes an integer encoding part 110 that, with respect to an inputted sequence of non-negative integer values x_n, n?{1, 2, . . . , N} (hereinafter referred to as an “integer sequence”), obtains a 1-bit code as a code corresponding to a run of integer values 0 of length L, a predetermined number which satisfies 2?L?2K?1, which is included in the integer sequence and obtains a (K×x_n)-bit or (K×x_n+1)-bit code as a code corresponding to a set of a run of integer values 0 of length from 0 to L?1 and one non-zero integer value x_n included in the integer sequence, where K is assumed to be an integer equal to or larger than 2.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: November 17, 2020
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke Sugiura, Yutaka Kamamoto, Takehiro Moriya, Noboru Harada
  • Patent number: 10811021
    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?.
    Type: Grant
    Filed: November 22, 2019
    Date of Patent: October 20, 2020
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Takehiro Moriya, Yutaka Kamamoto, Noboru Harada
  • Publication number: 20200273474
    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.
    Type: Application
    Filed: May 14, 2020
    Publication date: August 27, 2020
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takehiro MORIYA, Yutaka KAMAMOTO, Noboru HARADA