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公开(公告)号：AT211326T
公开(公告)日：2002-01-15
申请号：AT94916433
申请日：1994-05-31
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , HEDDLE ROBERT
Abstract: This method comprises the steps of converting the inputted acoustic signals into the frequency component; separating the output of conversion means to the tone component and the other component (noise component); coding the tone component; coding the noise component; and generating the code string from the output of the coding step.
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公开(公告)号：AU735150B2
公开(公告)日：2001-07-05
申请号：AU5970598
申请日：1998-03-30
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , SHIMOYOSHI OSAMU
Abstract: An encoding method and apparatus and a decoding method and apparatus in which the encoded information is decreased in volume and in which the encoding and decoding operations are performed with a smaller processing volume and a smaller buffer memory capacity. The apparatus includes a low range signal splitting circuit (261g, 261h) for separating low-range side signal components (260c,260d) from L and R channel signals (260a,260b) converted by a transform circuit into spectral signal components, and a channel synthesis circuit (261e) for synthesizing (L+R) channel signal components from the L and R channel spectral signal components (260c,260d). The apparatus also includes a high range signal separating circuit (261f) for separating the high range side signal components (260h) from the (L+R) channel signal components (260a,260b), a signal component encoding circuit (261j,261k) for compression-encoding low-range side signal components and a signal component encoding circuit (261i) for compression-encoding the normalization coefficient information obtained on normalization of the (L+R) channel high-range signal components.
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公开(公告)号：DE69231369D1
公开(公告)日：2000-09-21
申请号：DE69231369
申请日：1992-09-28
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA
Abstract: In a method for compressing a digital audio input signal to provide a recording signal, the input signal is divided (11) into frames comprising plural samples. Each frame of plural samples is transformed (11) into a block of spectral coefficients. The block of spectral coefficients is divided into plural bands that include lower frequency bands, and a lowest frequency band. Block floating is applied to the spectral coefficients in each band with a block floating coefficient being generated (13) for each band. The spectral coefficients in each band are quantized (15) with an adaptive number of bits to provide quantized spectral coefficients in each band, and a word length is generated for each band. Finally, a block of data derived from the block of spectral coefficients is added (81) to the recording signal. The block of data derived from the block of spectral coefficients consists of the quantized spectral coefficients, a main word length for each band, a main block floating coefficient for each band, and a reserve word length at least for each of the lower frequency bands.
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公开(公告)号：SG74538A1
公开(公告)日：2000-08-22
申请号：SG1995002286
申请日：1995-12-22
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , OIKAWA YOSHIAKI , SHIMOYOSHI OSAMU
Abstract: A method and apparatus for high efficiency encoding audio signals. The high-efficiency encoding apparatus includes a transform circuit (11; 61) for transforming an input signal into frequency components and a signal component separating circuit (62) for separating the frequency components into tonal components and noisy components. The high-efficiency encoding apparatus also includes a tonal component encoding circuit (63) for encoding tonal components and a noisy component encoding circuit (64) for encoding noisy components. The tonal components are made up only of signal components of a specified band and encoded along with the information specifying the band. The noisy components are normalized (31) and quantized (33) every pre-set encoding unit and encoded along with the quantization precision information. The information on the numbers of quantization steps of the noisy components is encoded with a smaller number of bits for the high- range side than for the low-range side. With the high-efficiency encoding method and apparatus, not only the main information but also the subsidiary information may be improved in encoding efficiency, while the degree of freedom may be assured in the method of representing the subsidiary information and satisfactory encoding may be achieved.
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公开(公告)号：DE69326484T2
公开(公告)日：2000-04-27
申请号：DE69326484
申请日：1993-01-28
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , AKAGIRI KENZO
Abstract: Apparatus for compressing a digital input signal, to provide a compressed digital output signal, comprises means (11-15) for deriving plural spectral coefficients from the digital input signal, and for grouping the spectral coefficients into bands, and adaptive bit allocation means (16-18) for adaptively allocating a number of signal-dependent quantizing bits among the bands to allocate to each band a number of signal-dependent quantizing bits for quantizing each spectral coefficient in the band, the number of signal-dependent quantizing bits allocated to each band being determined according to the band magnitude, weighted depending on the band frequency.
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Patent Agency Ranking
公开(公告)号：DE69230308D1
公开(公告)日：1999-12-23
申请号：DE69230308
申请日：1992-09-28
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA
IPC: G06F17/14
Abstract: A forward transform processing method for performing a modified discrete cosine transform. A block of N time domain input samples is multiplied by a forward transform window to provide a block of N processed samples which is transformed into a block of N/2 spectral coefficients by preprocessing the block of N processed samples to provide a block of N/4 complex numbers, transforming the block of N/4 complex numbers by the equivalent of a Fast Fourier Transform into a block of N/4 transformed complex numbers that is then post-processed to provide an output block of N/2 spectral coefficients in the frequency domain. The corresponding apparatus embodies the method just described. An inverse transform method for performing an inverse modified discrete cosine transform. A block of N/2 spectral coefficients is pre-processed to provide a block of N/4 frequency domain complex numbers, which is transformed into a block of N/4 time domain complex numbers by processing equivalent to a Fast Fourier Transform. The block of N/4 time domain complex numbers is post processed to provide a block of N/2 processed samples in the time domain, which is re-arrayed and multiplied by an inverse transform window to provide an output block of N samples in the time domain. The apparatus embodies the method just described.
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公开(公告)号：BR9800778A
公开(公告)日：1999-11-23
申请号：BR9800778
申请日：1998-02-26
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , SHIMOYOSHI OSAMU
Abstract: In case codes of old and new standards are recorded on the same recording medium, it is desirable that the signals of the old standard can be reproduced by an old standard accommodating reproducing device, while both signals can be reproduced by the new standard accommodating reproducing device such as to avoid lowering of the signal quality. To this end, if multi-channel signals are recorded in terms of a frame the size of which cannot be controlled, a second encoding circuit encodes signals of a channel reproduced by the old standard accommodating reproducing device, while a first encoding circuit encodes the signals of a channel reproduced by an old standard accommodating reproducing device with a number of bits smaller than the maximum number of bits that can be allocated to that frame. A codestring generating circuit arrays a code string encoded by the second encoding circuit in a void area of a frame provided by encoding in the first encoding circuit.
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公开(公告)号：AT185016T
公开(公告)日：1999-10-15
申请号：AT93300609
申请日：1993-01-28
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , AKAGIRI KENZO
Abstract: Apparatus for compressing a digital input signal, to provide a compressed digital output signal, comprises means (11-15) for deriving plural spectral coefficients from the digital input signal, and for grouping the spectral coefficients into bands, and adaptive bit allocation means (16-18) for adaptively allocating a number of signal-dependent quantizing bits among the bands to allocate to each band a number of signal-dependent quantizing bits for quantizing each spectral coefficient in the band, the number of signal-dependent quantizing bits allocated to each band being determined according to the band magnitude, weighted depending on the band frequency.
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公开(公告)号：TR9800315A2
公开(公告)日：1998-09-21
申请号：TR9800315
申请日：1998-02-26
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , SHIMOYOSHI OSAMU
CPC classification number: H04B1/665
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公开(公告)号：AU5631398A
公开(公告)日：1998-09-03
申请号：AU5631398
申请日：1998-02-25
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , SHIMOYOSHI OSAMU
Abstract: In case codes of old and new standards are recorded on the same recording medium, it is desirable that the signals of the old standard can be reproduced by an old standard accommodating reproducing device, while both signals can be reproduced by the new standard accommodating reproducing device such as to avoid lowering of the signal quality. To this end, if multi-channel signals are recorded in terms of a frame the size of which cannot be controlled, a second encoding circuit encodes signals of a channel reproduced by the old standard accommodating reproducing device, while a first encoding circuit encodes the signals of a channel reproduced by an old standard accommodating reproducing device with a number of bits smaller than the maximum number of bits that can be allocated to that frame. A codestring generating circuit arrays a code string encoded by the second encoding circuit in a void area of a frame provided by encoding in the first encoding circuit.
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