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公开(公告)号：US5285476A
公开(公告)日：1994-02-08
申请号：US85798092
申请日：1992-03-26
Applicant: SONY CORP
Inventor： KENZO AKAGIRI , KYOYA TSUTSUI
IPC: G10L19/002 , G10L19/02 , G10L19/022 , H04B1/66 , H04B14/04
CPC classification number: G10L19/0208 , G10L19/002 , G10L19/0204 , G10L19/022 , H04B1/665
Abstract: A coding apparatus comprising a band division filter (11) for dividing an input digital signal into signal components in a plurality of frequency bands, a block floating circuit (16) for implementing, every block, floating processing of an output signal of the band division filter (11), a plurality of orthogonal transform circuits (13, 14, 15) for orthogonally transforming respective output signals on the time base of the block floating circuit to signals on the frequency base, and an adaptive bit allocation encoder (18) for dividing output signals of the orthogonal transform circuits (13, 14, 15) into signal components in critical bands adaptively to allocate bit numbers thereto on the basis of allowed noise levels of respective critical bands, wherein the length in the time base direction of the blocks is caused to be variable, and the length in the time base direction of the blocks and a floating coefficient used in the floating processing are determined on the basis of the same index.
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公开(公告)号：ZA921988B
公开(公告)日：1993-02-24
申请号：ZA921988
申请日：1992-03-18
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , KYOYA TSUTSUI , SHIMOYOSHI OSAMU , OSAMU SHIMOYOSHI
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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3.发明专利
公开(公告)号：AU2604992A
公开(公告)日：1993-04-01
申请号：AU2604992
申请日：1992-09-29
Applicant: SONY CORP
Inventor： KYOYA TSUTSUI
IPC: H04B1/66
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：ZA9201988B
公开(公告)日：1993-02-24
申请号：ZA9201988
申请日：1992-03-18
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , KYOYA TSUTSUI , SHIMOYOSHI OSAMU , OSAMU SHIMOYOSHI
CPC classification number: G10L19/0212 , G11B20/00007 , G11B20/10527 , H04B1/665
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公开(公告)号：ES2149828T3
公开(公告)日：2000-11-16
申请号：ES94100597
申请日：1994-01-17
Applicant: SONY CORP
Inventor： KYOYA TSUTSUI , KANAGAWA JAPAN
IPC: H03M7/50 , H03M7/00 , H03M7/30 , G10L19/00 , H04L1/00 , H03M13/00 , G11B20/10 , G11B5/09 , G11B20/24
Abstract: In quantizing a digital signal every frequency bands by quantization units and transmitting (transmitting or recording) such quantized digital signal, second quantization accuracy information (Q2a to Q2d) indicating a difference between first quantization accuracy information (Q1a to Q1d) serving as a reference and actual quantization accuracy information (Qa to Qd) from a quantization accuracy determination unit (17) is coded at a quantization accuracy information coding unit (18) to transmit the coded quantization accuracy information to thereby realize efficient coding while maintaining the degree of freedom in the manner of giving quantization accuracy. Accordingly, more efficient coding can be attained while leaving the degree of freedom in the manner of giving quantization accuracy by a lesser number of bits..
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Patent Agency Ranking
公开(公告)号：DE69425768T2
公开(公告)日：2001-01-04
申请号：DE69425768
申请日：1994-01-17
Applicant: SONY CORP
Inventor： KYOYA TSUTSUI , KANAGAWA JAPAN
IPC: H03M7/50 , H03M7/00 , H03M7/30 , G10L19/00 , H04L1/00 , H03M13/00 , G11B20/10 , G11B5/09 , G11B20/24
Abstract: In quantizing a digital signal every frequency bands by quantization units and transmitting (transmitting or recording) such quantized digital signal, second quantization accuracy information (Q2a to Q2d) indicating a difference between first quantization accuracy information (Q1a to Q1d) serving as a reference and actual quantization accuracy information (Qa to Qd) from a quantization accuracy determination unit (17) is coded at a quantization accuracy information coding unit (18) to transmit the coded quantization accuracy information to thereby realize efficient coding while maintaining the degree of freedom in the manner of giving quantization accuracy. Accordingly, more efficient coding can be attained while leaving the degree of freedom in the manner of giving quantization accuracy by a lesser number of bits..
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公开(公告)号：DE69425768D1
公开(公告)日：2000-10-12
申请号：DE69425768
申请日：1994-01-17
Applicant: SONY CORP
Inventor： KYOYA TSUTSUI , KANAGAWA JAPAN
IPC: H03M7/50 , H03M7/00 , H03M7/30 , G10L19/00 , H04L1/00 , H03M13/00 , G11B20/10 , G11B5/09 , G11B20/24
Abstract: In quantizing a digital signal every frequency bands by quantization units and transmitting (transmitting or recording) such quantized digital signal, second quantization accuracy information (Q2a to Q2d) indicating a difference between first quantization accuracy information (Q1a to Q1d) serving as a reference and actual quantization accuracy information (Qa to Qd) from a quantization accuracy determination unit (17) is coded at a quantization accuracy information coding unit (18) to transmit the coded quantization accuracy information to thereby realize efficient coding while maintaining the degree of freedom in the manner of giving quantization accuracy. Accordingly, more efficient coding can be attained while leaving the degree of freedom in the manner of giving quantization accuracy by a lesser number of bits..
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公开(公告)号：MY110033A
公开(公告)日：1997-11-29
申请号：MYPI19920529
申请日：1992-03-27
Applicant: SONY CORP
Inventor： OSAMU SHIMOYOSHI , KYOYA TSUTSUI
Abstract: IN ACCORDANCE WITH THE PRESENT INVENTION, THERE IS PROVIDED A HIGH EFFICIENCY DIGITAL DATA ENCODING APPARATUS IN WHICH INPUT DIGITAL DATA ARE ARRANGED INTO BLOCKS BY PLURAL SAMPLES, ORTHOGONAL TRANSFORM IS EFFECTED IN EACH BLOCK TO PRODUCE COEFFICIENT DATA, WHICH COEFFICIENT DATA ARE ENCODED WITH AN ADAPTIVE NUMBER OF BITS, COMPRISING A PLURALITY OF ORTHOGONAL TRANSFORM MEANS FOR EFFECTING ORTHOGONAL TRANSFORM OF THE INPUT THAT DIGITAL DATA WITH DIFFERENT BLOCK LENGTHS, CHARACTERIZED IN THAT ONLY ONE OF OUTPUT FROM SAID ORTHOGONAL TRANSFORM MEANS IS SELECTED ON THE BASIS OF OUTPUTS OF SAID ORTHOGONAL TRANSFORM MEANS. IN ACCORDANCE WITH THE PRESENT INVENTION THERE IS ALSO PROVIDED A HIGH EFFICIENCY DIGITAL DATA ENCODING APPARATUS IN WHICH SAID INPUT DIGITAL DATA ARE DIVIDED INTO PLURAL BANDS, BLOCKS EACH COMPOSED OF PLURAL SAMPLES ARE FORMED IN EACH BAND, ORTHOGONAL TRANSFORM IS EFFECTED IN EACH BLOCK OF THE BAND TO PRODUCE COEFFICIENT DATA WHICH COEFFICIENT DATA ARE ENCODED, COMPRISING A BLOCK LENGTH DECISION CIRCUIT FOR DETERMINING THE BLOCK LENGTH FOR ORTHOGONAL TRANSFORM OF EACH BAND BASED ON CHARACTERISTICS OF BLOCK DATA PRIOR TO ORTHOGONAL TRANSFORM OF EACH BAND, WHEREIN SAID ORTHOGONAL TRANSFORM OF EACH BAND IS EFFECTED WITH THE BLOCK LENGTH DETERMINED BY SAID BLOCK LENGTH DECISION CIRCUIT. (FIGURE 14)
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9.发明专利
公开(公告)号：AU3195393A
公开(公告)日：1993-08-05
申请号：AU3195393
申请日：1993-01-21
Applicant: SONY CORP
Inventor： KYOYA TSUTSUI , KENZO AKAGIRI
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：AU1448992A
公开(公告)日：1992-11-02
申请号：AU1448992
申请日：1992-03-27
Applicant: SONY CORP
Inventor： KYOYA TSUTSUI , OSAMU SHIMOYOSHI
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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