公开(公告)号：US20220383106A1

公开(公告)日：2022-12-01

申请号：US17619593

申请日：2019-06-20

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Masahiro YASUDA ,  Yuma KOIZUMI ,  Noboru HARADA

IPC分类号： G06N3/08 ,  H04S7/00 ,  H04S1/00

摘要： An input of a first observation signal corresponding to an incoming signal from a first direction is received, an angular rotation operation of the first observation signal is performed to obtain a second observation signal corresponding to an incoming signal from a second direction that is different from the first direction and the second observation signal is added to a set of training data.

公开(公告)号：US20210335375A1

公开(公告)日：2021-10-28

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： G10L19/07 ,  G10L19/038

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：US20200162102A1

公开(公告)日：2020-05-21

申请号：US16618567

申请日：2018-04-20

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Ryosuke SUGIURA ,  Yutaka KAMAMOTO ,  Takehiro MORIYA ,  Noboru HARADA

IPC分类号： H03M7/40

摘要： 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.

公开(公告)号：US20190304476A1

公开(公告)日：2019-10-03

申请号：US16429590

申请日：2019-06-03

申请人： Nippon Telegraph and Telephone Corporation

发明人： Takehiro MORIYA ,  Yutaka KAMAMOTO ,  Noboru HARADA

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

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：US20180040330A1

公开(公告)日：2018-02-08

申请号：US15725653

申请日：2017-10-05

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takehiro MORIYA ,  Noboru HARADA ,  Yutaka KAMAMOTO

IPC分类号： G10L19/09 ,  G10L19/032

CPC分类号： G10L19/09 ,  G10L19/032

摘要： In encoding, pitch periods for time series signals in a predetermined time interval are calculated, and a code corresponding thereto is output. In that encoding, the resolutions for expressing the pitch periods and/or a pitch period encoding mode are switched according to whether an index indicating a periodicity and/or stationarity level of the time series signals satisfies a condition indicating high or low in periodicity and/or stationarity. In that decoding, according to whether an index indicating a periodicity and/or stationarity level, the index being included in or obtained from an input code corresponding to the predetermined time interval, satisfies a condition indicating high periodicity and/or stationarity, a decoding mode for a code, included in the input code, corresponding to pitch periods is switched to decode the code corresponding to the pitch periods to obtain the pitch periods corresponding to the predetermined time interval.

公开(公告)号：US20180040329A1

公开(公告)日：2018-02-08

申请号：US15725626

申请日：2017-10-05

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Takehiro MORIYA ,  Noboru HARADA ,  Yutaka KAMAMOTO

IPC分类号： G10L19/09 ,  G10L19/032

CPC分类号： G10L19/09 ,  G10L19/032

摘要： In encoding, pitch periods for time series signals in a predetermined time interval are calculated, and a code corresponding thereto is output. In that encoding, the resolutions for expressing the pitch periods and/or a pitch period encoding mode are switched according to whether an index indicating a periodicity and/or stationarity level of the time series signals satisfies a condition indicating high or low in periodicity and/or stationarity. In that decoding, according to whether an index indicating a periodicity and/or stationarity level, the index being included in or obtained from an input code corresponding to the predetermined time interval, satisfies a condition indicating high periodicity and/or stationarity, a decoding mode for a code, included in the input code, corresponding to pitch periods is switched to decode the code corresponding to the pitch periods to obtain the pitch periods corresponding to the predetermined time interval.

公开(公告)号：US20220122629A1

公开(公告)日：2022-04-21

申请号：US17425672

申请日：2020-01-16

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Yuma KOIZUMI ,  Shin MURATA ,  Noboru HARADA ,  Shoichiro SAITO

IPC分类号： G10L25/78 ,  G10L25/51 ,  G10L25/30

摘要： The accuracy of unsupervised anomalous sound detection is improved. An anomalous sound generation unit 12 generates a pseudo-anomalous sound by associating a sound obtained from a predetermined device with a probability distribution followed by a sound obtained from a desired device group. A threshold value setting unit 13 sets a threshold value so that all anomaly scores calculated from the pseudo-anomalous sound are determined to be anomalous. A parameter update unit 14 uses an obtained normal sound and an obtained anomalous sound, or a threshold value and a value based on the obtained anomalous sound, to update a parameter so to reliably determine an anomalous sound as anomalous and minimize the probability of determining a normal sound as anomalous.

公开(公告)号：US20200176006A1

公开(公告)日：2020-06-04

申请号：US16782700

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：US20200090665A1

公开(公告)日：2020-03-19

申请号：US16687176

申请日：2019-11-18

申请人： Nippon Telegraph and Telephone Corporation

发明人： Takehiro MORIYA ,  Noboru HARADA ,  Yutaka KAMAMOTO ,  Yusuke HIWASAKI ,  Masahiro FUKUI

IPC分类号： G10L19/005 ,  G10L19/032 ,  G10L19/24 ,  G10L19/008 ,  G10L21/038 ,  G10L19/16

摘要： 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.

公开(公告)号：US20190115036A1

公开(公告)日：2019-04-18

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

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.