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Moriya Takehiro, Harada Noboru, Jin Akio, Ikeda Kazunaga: (Ja) ディジタル信号処理方法、その処理器、そのプログラム、及びそのプログラムを格納した記録媒体, (En) Digital signal processing method, processor thereof, program thereof, and recording medium containing the program. Nippon Telegraph And Telephone Corporation, Moriya Takehiro, Harada Noboru, Jin Akio, Ikeda Kazunaga, KUSANO Takashi, June 3, 2004: WO/2004/047305 (31 worldwide citation)

(EN) From a sample SFC of a current frame, a sample string S similar to its head, sample string, and an end sample string is extracted, concatenated before and after the current frame as a substitute sample string AS, and subjected to filter processing or prediction encoding so as to obtain a proces ...


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Moriya Takehiro, Mori Takeshi, Ikeda Kazunaga, Iwakami Naoki: Multichannel acoustic signal coding and decoding methods and coding and decoding devices using the same. Nippon Telegraph & Telephone, August 12, 1998: EP0858067-A2 (26 worldwide citation)

In multichannel acoustic signal coding and decoding, left-and right-channel signals are alternately interleaved for each sample to generate a one-dimensional signal sample sequence. The one-dimensional signal sample sequence is subjected to coding based on correlation. In coding, the left- and right ...


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Iwakami Naoki, Moriya Takehiro, Miki Satoshi: Acoustic signal transform coding method and decoding method.. Nippon Telegraph & Telephone, September 20, 1995: EP0673014-A2 (22 worldwide citation)

An input acoustic signal is subjected to modified discrete cosine transform processing to obtain its spectrum characteristics. On the other hand, linear prediction coefficients are derived from the input acoustic signal in a linear prediction coding analysis part (17), and the prediction coefficient ...


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Moriya Takehiro C O Nippon Tel: Method and apparatus for multiplexed vector quantization.. Nippon Telegraph & Telephone, May 3, 1989: EP0314018-A2 (22 worldwide citation)

A plurality of codebooks are provided each of which has a predetermined number of candidate vectors. A distortion between each input vector and an averaged vector of a set of candidate vectors, each selected from one of the codebooks, is calculated for all combinations of candidate vectors, and a co ...


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Jin Akio, Moriya Takehiro, Ikeda Kazunaga, Mori Takeshi: Sound encoding method, decoding method, encoding device, decoding device, encoding program, and decoding program. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, August 29, 2003: JP2003-241799 (17 worldwide citation)

PROBLEM TO BE SOLVED: To provide a sound encoding method which applies scalable encoding and suppresses sound quality deterioration even in a state wherein a packet loss is generated.SOLUTION: Waveforms are cut out of an input sound signal at specified time intervals (step 101) and a scalable encodi ...


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Iwagami Naoki, Moriya Takehiro, Jin Akio, Chikira Kazuaki, Mori Takeshi: Audio signal encoding method and decoding method, device therefor, and program recording medium. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, December 8, 2000: JP2000-338998 (17 worldwide citation)

PROBLEM TO BE SOLVED: To encode an input voice containing a tone component much in high area with high efficiency by dividing the frequency area coefficient of an input signal sample to generate a coefficient small piece group, classifying the coefficient small pieces to a plurality of groups follow ...


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Miki Satoshi, Moriya Takehiro, Mano Kazunori, Ohmuro Hitoshi, Suda Hirohito: Speech coding and decoding methods.. Nippon Telegraph & Telephone, November 25, 1992: EP0514912-A2 (12 worldwide citation)

An excitation vector of the previous frame stored in an adaptive codebook is cut out with a selected pitch period. The excitation vector thus cut out is repeated until one frame is formed, by which a periodic component codevector is generated (S2). An optimum pitch period is searched for so that dis ...


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Moriya Takehiro, Jin Akio, Ikeda Kazunaga, Mori Takeshi: Digital signal encoding method, decoding method, encoding device, decoding device, digital signal encoding program, and decoding program. Nippon Telegraph & Telephone, December 8, 2004: EP1484841-A1 (12 worldwide citation)

A down sampler 13 down samples a digital signal in the sampling frequency thereof from 96 kHz to 48 kHz on a frame-by-frame basis. The converted signal is compression encoded and output as a main code Im. An up sampler 16 converts a partial signal corresponding to the main code Im to a signal having ...


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Moriya Takehiro, Iwagami Naoki, Jin Akio, Mori Takeshi: Coding method of stereophonic signal. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, September 21, 2001: JP2001-255892 (11 worldwide citation)

PROBLEM TO BE SOLVED: To reduce the degradation in quality even though the amount of information is small while left and right signals are extremely similar with respect to each other.SOLUTION: Sum and difference vectors M and S of left and right signals L and S are obtained (12). These vectors are ...


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Moriya Takehiro, Iwagami Naoki, Jin Akio, Mori Takeshi, Chikira Kazuaki: Reversible coding method, reversible decoding method, system adopting the methods and each program recording medium. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, February 16, 2001: JP2001-044847 (10 worldwide citation)

PROBLEM TO BE SOLVED: To compress a digital input signal at a high compression rate and to completely reproduce the signal. SOLUTION: This reversible coding method includes a process, where a digital input signal is converted into a bit stream in a code absolute value expression for each frame, a pr ...