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).

  • Publication number: 20240062767
    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: October 25, 2023
    Publication date: February 22, 2024
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takehiro MORIYA, Yutaka KAMAMOTO, Noboru HARADA
  • Publication number: 20230410832
    Abstract: For each frame, an n-th channel compensated decoded sound signal {tilde over (?)}X?n is obtained that is a signal obtained by compensating a high frequency of an n-th channel purified decoded sound signal {tilde over (?)}Xn obtained by performing signal processing in a time domain on an n-th channel decoded sound signal {circumflex over (?)}Xn that is a decoded sound signal of each channel of stereo obtained by decoding a stereo code CS.
    Type: Application
    Filed: November 5, 2020
    Publication date: December 21, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Patent number: 11848021
    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: September 29, 2022
    Date of Patent: December 19, 2023
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takehiro Moriya, Yutaka Kamamoto, Noboru Harada
  • Publication number: 20230402044
    Abstract: A sound signal purification method includes a monaural decoded sound upmixing step of obtaining, an n-th channel upmixed monaural decoded sound signal {circumflex over (?)}XMn that is a signal obtained by upmixing a monaural decoded sound signal {circumflex over (?)}XM for each channel by an upmixing process using the monaural decoded sound signal {circumflex over (?)}XM and inter-channel relationship information that is information indicating a relationship between channels of stereo, and an n-th channel signal purification step of obtaining a sequence based on a value {tilde over (?)}xn(t) obtained by adding a value ?n×{circumflex over (?)}xMn(t) obtained by multiplying an n-th channel purification weight ?n by a sample value {circumflex over (?)}xMn(t) of the n-th channel upmixed monaural decoded sound signal {circumflex over (?)}XMn and a value obtained by multiplying a value (1??n) obtained by subtracting the n-th channel purification weight ?n from 1 by a sample value {circumflex over (?)}xn(t) of the n
    Type: Application
    Filed: November 5, 2020
    Publication date: December 14, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Publication number: 20230402051
    Abstract: For each frame, an n-th channel compensated decoded sound signal ˜X?n is obtained that is a signal obtained by compensating a high frequency of an n-th channel purified decoded sound signal ˜Xn obtained by performing signal processing in a time domain on an n-th channel decoded sound signal {circumflex over (?)}Xn that is a decoded sound signal of each channel of stereo obtained by decoding a stereo code CS.
    Type: Application
    Filed: November 5, 2020
    Publication date: December 14, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Publication number: 20230395081
    Abstract: For each frame, an n-th channel compensated decoded sound signal ˜X?n is obtained that is a signal obtained by compensating a high frequency of an n-th channel purified decoded sound signal ˜Xn obtained by performing signal processing in a time domain on an n-th channel decoded sound signal {circumflex over (?)}Xn (n is each integer of 1 or more and N or less) that is a decoded sound signal of each channel of stereo obtained by decoding a stereo code CS.
    Type: Application
    Filed: November 5, 2020
    Publication date: December 7, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Publication number: 20230395080
    Abstract: A sound signal purification method includes an n-th channel signal purification step of obtaining, for each frame and for each corresponding sample t with respect to each channel n, a sequence based on a value ˜xn(t)=(1??n)×{circumflex over (?)}xn(t)+?n×{circumflex over (?)}xM(t) obtained by adding a value ?n×{circumflex over (?)}xM(t) obtained by multiplying an n-th channel purification weight an by a sample value {circumflex over (?)}xM(t) of the monaural decoded sound signal {circumflex over (?)}XM and a value (1??n)×{circumflex over (?)}xn(t) obtained by multiplying a value (1??n) obtained by subtracting the n-th channel purification weight ?n from 1 by a sample value {circumflex over (?)}xn(t) of the n-th channel decoded sound signal {circumflex over (?)}Xn, as the n-th channel purified decoded sound signal ˜Xn.
    Type: Application
    Filed: November 5, 2020
    Publication date: December 7, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Publication number: 20230395092
    Abstract: For each frame, an n-th channel compensated decoded sound signal ˜X?n is obtained that is a signal obtained by compensating a high frequency of an n-th channel purified decoded sound signal ˜Xn obtained by performing signal processing in a time domain on an n-th channel decoded sound signal {circumflex over (?)}Xn obtained by decoding a stereo code CS.
    Type: Application
    Filed: November 5, 2020
    Publication date: December 7, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Patent number: 11837241
    Abstract: A technique is provided that can reduce degradation of the sound quality due to a tandem connection of paired coding and decoding, and can reduce the operation processing amount and the required memory amount of a multipoint control unit. At a terminal of a communication network having a larger communication capacity in multipoint connection between terminals in a plurality of communication networks (e.g., a fixed phone line and a mobile phone line) having different communication capacities, a multichannel coding including a monaural coding scheme of the communication network having the smaller communication capacity is performed on the coding side, whereas decoding of a multichannel-coded code of one point, decoding of a monaural-coded code of one point, or decoding of a monaural-coded code of a plurality of points is performed on the decoding side in accordance with the input code.
    Type: Grant
    Filed: January 7, 2020
    Date of Patent: December 5, 2023
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takehiro Moriya, Yutaka Kamamoto, Ryosuke Sugiura
  • Publication number: 20230386481
    Abstract: There is provided a technology that improves, in a case where there is a sound signal obtained from a different code that is different from a code from which a decoded sound signal is obtained and that is derived from the same sound signal, the decoded sound signal by using the sound signal obtained from the different code. A signal (hereinafter, referred to as an upmixed common signal) obtained by upmixing a decoded sound common signal obtained by downmixing a decoded sound signal of each channel is subjected to signal purification using a signal (hereinafter, referred to as an upmixed monaural decoded sound signal) obtained by upmixing a monaural decoded sound signal to thereby generate a purified upmixed signal, and in each channel, the upmixed common signal is subtracted from the decoded sound signal and the purified upmixed signal is added thereto, to thereby generate a purified decoded sound signal.
    Type: Application
    Filed: November 5, 2020
    Publication date: November 30, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Publication number: 20230386498
    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: July 7, 2023
    Publication date: November 30, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yutaka KAMAMOTO, Ryosuke SUGIURA, Takehiro MORIYA
  • Publication number: 20230386482
    Abstract: There is provided a technology that improves, in a case where there is a sound signal obtained from a different code that is different from a code from which a decoded sound signal is obtained and that is derived from the same sound signal, the decoded sound signal by using the sound signal obtained from the different code. A signal (hereinafter, referred to as a decoded sound common signal) obtained by downmixing a decoded sound signal of each channel is subjected to signal purification using a monaural decoded sound signal to thereby generate a purified common signal, and in each channel, the decoded sound common signal is subtracted from the decoded sound signal and the purified common signal is added thereto, to thereby generate a purified decoded sound signal.
    Type: Application
    Filed: November 5, 2020
    Publication date: November 30, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Publication number: 20230386497
    Abstract: For each frame, an n-th channel compensated decoded sound signal ˜X?n is obtained that is a signal obtained by compensating a high frequency of an n-th channel purified decoded sound signal ˜Xn obtained by performing signal processing in a time domain on an n-th channel decoded sound signal {circumflex over (?)}Xn (n is each integer of 1 or more and N or less) that is a decoded sound signal of each channel of stereo obtained by decoding a stereo code CS.
    Type: Application
    Filed: November 5, 2020
    Publication date: November 30, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Publication number: 20230386480
    Abstract: There is provided a technology that improves, in a case where there is a sound signal obtained from a different code that is different from a code from which a decoded sound signal is obtained and that is derived from the same sound signal, the decoded sound signal by using the sound signal obtained from the different code. A signal (hereinafter, referred to as an upmixed common signal) obtained by upmixing a decoded sound common signal obtained by downmixing a decoded sound signal of each channel is subjected to signal purification using a signal (hereinafter, referred to as an upmixed monaural decoded sound signal) obtained by upmixing a monaural decoded sound signal to thereby generate a purified upmixed signal, and in each channel, the upmixed common signal is subtracted from the decoded sound signal and the purified upmixed signal is added thereto, to thereby generate a purified decoded sound signal.
    Type: Application
    Filed: November 5, 2020
    Publication date: November 30, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Publication number: 20230377585
    Abstract: There is provided a technology that improves, in a case where there is a sound signal obtained from a different code that is different from a code from which a decoded sound signal is obtained and that is derived from the same sound signal, the decoded sound signal by using the sound signal obtained from the different code. A signal (hereinafter, referred to as an upmixed common signal) obtained by upmixing a decoded sound common signal obtained by downmixing a decoded sound signal of each channel is subjected to signal purification using a signal (hereinafter, referred to as an upmixed monaural decoded sound signal) obtained by upmixing a monaural decoded sound signal to thereby generate a purified upmixed signal, and in each channel, the upmixed common signal is subtracted from the decoded sound signal and the purified upmixed signal is added thereto, to thereby generate a purified decoded sound signal.
    Type: Application
    Filed: November 5, 2020
    Publication date: November 23, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Patent number: 11810581
    Abstract: A technique is provided that can reduce degradation of the sound quality due to a tandem connection of paired coding and decoding, and can reduce the operation processing amount and the required memory amount of a multipoint control unit. In multipoint connection between terminals of a plurality of communication networks (for example, a fixed phone line and a mobile phone line) having different communication capacities, when a multichannel coding including a monaural coding scheme of a communication network having a smaller communication capacity is used in a communication network having a larger communication capacity to transmit sounds of a plurality points to the communication network terminal having the larger communication capacity, control is exercised such that monaural codes of the plurality points are output.
    Type: Grant
    Filed: January 7, 2020
    Date of Patent: November 7, 2023
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takehiro Moriya, Yutaka Kamamoto, Ryosuke Sugiura
  • Publication number: 20230319498
    Abstract: A sound signal downmix device for obtaining a downmix signal that is a signal obtained by mixing a left channel input sound signal and a right channel input sound signal includes a left-right relationship information acquisition unit 185 that obtains preceding channel information that is information indicating which of the left channel input sound signal and the right channel input sound signal is preceding and a left-right correlation coefficient that is a correlation coefficient between the left channel input sound signal and the right channel input sound signal and a downmix unit 112 that obtains the downmix signal by weighted averaging the left channel input sound signal and the right channel input sound signal to include a larger amount of an input sound signal of a preceding channel among the left channel input sound signal and the right channel input sound signal as the left-right correlation coefficient is greater, based on the preceding channel information and the left-right correlation coefficient.
    Type: Application
    Filed: November 4, 2020
    Publication date: October 5, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Takehiro MORIYA, Yutaka KAMAMOTO
  • Publication number: 20230318622
    Abstract: A sequence of integer values is encoded and decoded with a number of bits of a decimal value substantially assigned per sample or/and with a smaller memory amount or calculation processing amount than in the prior art. The encoder receives the sequence of integer values as input and outputs an integer code corresponding to the sequence of integer values. An integer transformer (11) obtains one integer value (transformed integer) through algebraically-representable bijective transformation for each of a plurality of sets of integer values included in the inputted sequence of integer values. An integer encoder (12) encodes the transformed integer to thereby obtain an integer code.
    Type: Application
    Filed: April 18, 2018
    Publication date: October 5, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Ryosuke SUGIURA, Yutaka KAMAMOTO, Takehiro MORIYA
  • Publication number: 20230306976
    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: Application
    Filed: May 9, 2023
    Publication date: September 28, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takehiro MORIYA, Yutaka KAMAMOTO, Noboru HARADA
  • Publication number: 20230298598
    Abstract: There is provided such embedded decoding that the algorithmic delay of stereo coding/decoding is not larger than that of monaural coding/decoding. A decoding device (200) decodes a code to obtain a decoded sound signal. A monaural decoding unit (210) decodes a monaural code by a scheme that includes applying a window having overlap between frames to obtain a monaural decoded sound signal. An additional decoding unit (230) decodes an additional code to obtain an additional decoded signal for a section X corresponding to the overlap between a current frame and an immediately following frame. A stereo decoding unit (220) obtains a decoded downmix signal by concatenating a part of the monaural decoded sound signal for a section except the section X and the additional decoded signal for the section X, and obtains and outputs the decoded sound signal by upmix processing using a characteristic parameter obtained from a stereo code.
    Type: Application
    Filed: June 24, 2020
    Publication date: September 21, 2023
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Takehiro MORIYA, Ryosuke SUGIURA, Yutaka KAMAMOTO