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公开(公告)号：DE69533577D1
公开(公告)日：2004-11-04
申请号：DE69533577
申请日：1995-12-19
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：AU757422B2
公开(公告)日：2003-02-20
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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公开(公告)号：DE69527223D1
公开(公告)日：2002-08-08
申请号：DE69527223
申请日：1995-03-31
Applicant: SONY CORP
Inventor： SHIMOYOSHI OSAMU , SONOHARA MITO , TSUTSUI KYOYA
Abstract: A data encoding method and apparatus in which the volume of arithmetic-logical operations for calculating the total number of bits required for encoding for adaptive bit allocation in the variable length encoding system for expediting the processing. In the data encoding apparatus for encoding and subsequently variable length encoding the input data, spectral data obtained on orthogonal transform coding are routed to a block floating circuit (403) for normalization and re-quantized in a quantization circuit (404) depending on the bit allocation number information from a bit allocation calculating circuit (406) so as to be then variable length encoded by an encoding circuit (407) and outputted at an output terminal (408). In the bit allocation calculation circuit (406), reference is had to a table for bit number calculation (409) in which re-quantized data domain is divided at boundary points corresponding to code length transitions in order to calculate the total number of bits required for encoding for use in adjusting the numbers of allocated bits with a smaller volume of the arithmetic-logical operations.
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公开(公告)号：DE69429687D1
公开(公告)日：2002-03-14
申请号：DE69429687
申请日：1994-03-09
Applicant: SONY CORP
Inventor： SUZUKI HIROSHI , AKAGIRI KENZO , SHIMOYOSHI OSAMU , MITSUNO MAKOTO
Abstract: In a recording/reproducing or transmitting/receiving device for compressed data, the temporal size of a processing block during the compression process is rendered variable in response to larger amplitude changes in the input signals. The device includes power calculating circuits (304 to 306) for calculating the masking effect on the processing block based on amplitude changes in the waveform on the time axis of various frequency bands of the processing block as well as on the power of a processing block(s) other than the processing block in subject for determining the temporal size of the processing block in subject, a primary block size decision circuit (310) and a block size correction circuit (311). The device enables the achievement of high efficiency compression and expansion with superior sound quality as perceived by the ear.
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公开(公告)号：NO306007B1
公开(公告)日：1999-08-30
申请号：NO924551
申请日：1992-11-25
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , SHIMOYOSHI OSAMU
Abstract: An apparatus for compressing a digital input signal compresses a digital input signal arranged into frames of plural samples. The digital input signal is orthogonally transformed by plural orthogonal transform circuits in blocks derived by dividing the frames by a different divisor in each circuit. The resulting spectral coefficients are quantized using an adaptive number of bits. The output of one orthogonal transform circuit is selected based on the outputs of the orthogonal transform circuits. The digital input signal is divided into plural frequency ranges, and frames are formed in each range. A block length decision circuit determines division of the frames of each range signal into blocks in response to range signal dynamics. The range signals are orthogonally transformed in blocks and the spectral coefficients are quantized. The apparatus also includes a frequency analyzing circuit that derives spectral data points from the input data, and groups them in plural bands. A noise level setting circuit finds the energy in each band and sets a allowable noise level in response to the band energy. A block floating coefficient calculating circuit calculates block floating coefficients based on the maximum spectral data point in each band. A quantizing bit number decision circuit determines the number of bits to use for quantizing in response to the allowable noise level and the block floating coefficients. A quantizing circuit quantizes the spectral data points in response to the quantizing bit number decision circuit.
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Patent Agency Ranking
公开(公告)号：MX9801478A
公开(公告)日：1998-11-30
申请号：MX9801478
申请日：1998-02-24
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , SHIMOYOSHI OSAMU
Abstract: En caso de que los codigos de las normas antigua y nueva que se registran en el mismo medio de registro, es deseable que las señales de la norma antigua puedan reproducirse mediante un dispositivo de reproduccion de acomodo de la norma antigua, mientras que ambas señales se reproducen mediante un dispositivo de reproduccion de acomodo de la norma nueva, a fin de evitar y disminuir la calidad de la señal. Para este fin, si las señales de canales multiples se registran en térmicos de un cuadro, el tamaño del cual no se puede controlar, un segundo circuito de codificacion codifica las señales de un canal reproducidas por el dispositivo de reproduccion de acomodo de la norma antigua, mientras que un primer circuito de codificacion codifica las señales de un canal reproducido mediante un dispositivo de reproduccion que acomoda la norma antigua, con un numero de bits más pequeño que el numero máximo de bits que se pueden asignar a ese cuadro. Un circuito generador de sarta de codigos forma una sarta de codigos codificada mediante el segundo circuito de codificacion, en un área de huecos de un cuadro, proporcionada mediante codificacion en el primer circuito de codificacion.
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公开(公告)号：PL325654A1
公开(公告)日：1998-10-12
申请号：PL32565498
申请日：1998-03-31
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：CA2230156A1
公开(公告)日：1998-08-26
申请号：CA2230156
申请日：1998-02-23
Applicant: SONY CORP
Inventor： SHIMOYOSHI OSAMU , TSUTSUI KYOYA
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 codestring 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：DE69319494D1
公开(公告)日：1998-08-13
申请号：DE69319494
申请日：1993-04-23
Applicant: SONY CORP
Inventor： SHIMOYOSHI OSAMU , TSUTSUI KYOKA
Abstract: A high efficiency encoding system for compressing and encoding audio signals includes a signal energy calculating circuit (8) for calculating allowable noise energies by utilizing characteristics of human acoustic sense and calculating allowable noise energies of a block under consideration by weighted addition of the allowable noise energies calculated for at least one past block with respect to the block under consideration, a first-order allowable noise energy calculating unit (9), a second-order allowable noise energy calculating unit (10), a calculating circuit for calculating characteristics of human acoustic sense (11) , and a memory (12). Adaptive quantization is performed in a quantization circuit (31) with the bit allocation number which is based on the calculated allowable noise energies. Signals undergoing large temporal fluctuations can be encoded efficiently, while aurally outstanding noise may be reduced to improve the sound quality by eliminating sound quality deterioration known as pre-echo.
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公开(公告)号：AT153165T
公开(公告)日：1997-05-15
申请号：AT92907630
申请日：1992-03-27
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , SHIMOYOSHI OSAMU
Abstract: An apparatus for compressing a digital input signal compresses a digital input signal arranged into frames of plural samples. The digital input signal is orthogonally transformed by plural orthogonal transform circuits in blocks derived by dividing the frames by a different divisor in each circuit. The resulting spectral coefficients are quantized using an adaptive number of bits. The output of one orthogonal transform circuit is selected based on the outputs of the orthogonal transform circuits. The digital input signal is divided into plural frequency ranges, and frames are formed in each range. A block length decision circuit determines division of the frames of each range signal into blocks in response to range signal dynamics. The range signals are orthogonally transformed in blocks and the spectral coefficients are quantized. The apparatus also includes a frequency analyzing circuit that derives spectral data points from the input data, and groups them in plural bands. A noise level setting circuit finds the energy in each band and sets a allowable noise level in response to the band energy. A block floating coefficient calculating circuit calculates block floating coefficients based on the maximum spectral data point in each band. A quantizing bit number decision circuit determines the number of bits to use for quantizing in response to the allowable noise level and the block floating coefficients. A quantizing circuit quantizes the spectral data points in response to the quantizing bit number decision circuit.
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