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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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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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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 ...


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Moriya Takehiro, Jin Akio, Ikeda Kazunaga, Mori Takeshi: Encoding method for digital signal, decoding method therefor, apparatus for the methods and program thereof. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, November 21, 2003: JP2003-332914 (7 worldwide citation)

PROBLEM TO BE SOLVED: To provide an encoding method capable of correcting missing bits.SOLUTION: In the method, coordinate bit strings are created by combining bits over a frame by corresponding bits of a series of samples by frames of an input digital signal, and the coordinate bit strings are outp ...


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Moriya Takehiro, Iwagami Naoki, Mori Takeshi, Jin Akio: Method for hierarchically encoding and decoding acoustic signal. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, August 24, 2001: JP2001-230675 (6 worldwide citation)

PROBLEM TO BE SOLVED: To reduce the effects of a transmission error or packet loss by deforming an error spread over hierarchies, in bit rate scalable encoding and decoding, based on hierarchical quantization such as controlling of an amplitude.SOLUTION: A signal, deformed into input signal by a fir ...


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Iwakami Naoki, Moriya Takehiro, Jin Akio, Chikira Kazuaki, Mori Takeshi: Audio signal coding and decoding methods and apparatus and recording media with programs therefor. Nippon Telegraph & Telephone, October 25, 2000: EP1047047-A2 (5 worldwide citation)

An input signal is time-frequency transformed, then the frequency-domain coefficients are divided into coefficient segments of about 100 Hz width to generate a sequence of coefficient segments, and the sequence of coefficient segments is split into subbands each consisting of plural coefficient segm ...


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Jin Akio, Moriya Takehiro, Iwagami Naoki, Mori Takeshi, Chikira Kazuaki: Method and device for encoding signal, recording medium recorded with signal encoding program. Nippon Telegr &Amp Teleph Corp &Lt Ntt&Gt, April 26, 2002: JP2002-123298 (5 worldwide citation)

PROBLEM TO BE SOLVED: To provide a method for masking hearing sensation highly accurately by precisely estimating the position of a mountain and a valley in a spectral envelope curved line when vocal and musical sound signals are encoded.SOLUTION: The device is provided with a T/F converter 11 which ...