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公开(公告)号：AT207648T
公开(公告)日：2001-11-15
申请号：AT95901610
申请日：1994-11-29
Applicant: SONY CORP
Inventor： SONOHARA MITO , TSUTSUI KYOYA , HEDDLE ROBERT
IPC: H04N5/92 , G10L19/02 , G11B20/10 , H03M7/30 , H03M7/40 , H04N19/115 , H04N19/124 , H04N19/13 , H04N19/132 , H04N19/134 , H04N19/136 , H04N19/14 , H04N19/146 , H04N19/169 , H04N19/174 , H04N19/176 , H04N19/18 , H04N19/192 , H04N19/196 , H04N19/42 , H04N19/423 , H04N19/46 , H04N19/60 , H04N19/625 , H04N19/635 , H04N19/70 , H04N19/80 , H04N19/85 , H04N19/91 , H04B1/66
Abstract: An input signal is divided into blocks and converted into spectrum signals. Each of the spectrum signals are further divided into units and normalized. The normalized spectrum signals are transformed into variable-length codes and outputted together with the normalization coefficients and the number of bits of requantization. An upper limit is put on the number of bits of the outputted signals per block. If the numbers of bits of some signals blocks exceed the upper limit, the normalization coefficients of at least one of the units are forcedly changed. The signals whose normalization coefficients have been forcedly changed are requantized, entropy-coded, and outputted. Thus, without influence of the variation of the numbers of bits due to the variable-length encoding, the hardware scale can be smaller that conventional ones, and the encoding/decoding is efficient and not aurally affected.
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公开(公告)号：DE69428030D1
公开(公告)日：2001-09-27
申请号：DE69428030
申请日：1994-06-29
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA , SONOHARA MITO
Abstract: A signal encoding apparatus for encoding an acoustic signal. This signal encoding apparatus includes a transform circuit for transforming an inputted acoustic signal into frequency components, a signal component separating circuit for separating an output of the transform circuit into tone characteristic components and noise characteristic components, a tone characteristic encoding circuit for encoding a signal of tone characteristic components, and a noise characteristic component encoding circuit for encoding a signal of noise characteristic components, wherein the tone characteristic component encoding circuit encodes respective signal components of the signal of tone characteristic components so that they respectively have different code lengths to thereby improve efficiency of encoding without degrading sound quality with respect to acoustic signal of tone characteristic.
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公开(公告)号：SG76469A1
公开(公告)日：2000-11-21
申请号：SG1996008093
申请日：1991-08-22
Applicant: SONY CORP
Inventor： AKAGIRI KENSO , TSUTSUI KYOYA
Abstract: In a digital signal encoder for analyzing an input digital signal by frequency analysis means (10) of the non-block type and frequency analysis means (20, 40, 60) of the block type to quantize outputs obtained, a quantization characteristic (29, 49, 69) is set in the basis of an allowable noise level based on an energy within a predetermined time period of an output from the block type frequency analysis means (10) and an allowable noise level based on an energy of at least one of data preceding and succeeding in time within the predetermined time period, thereby to provide a real time processing.
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公开(公告)号：ES2138992T3
公开(公告)日：2000-02-01
申请号：ES93300609
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：DE69227570T2
公开(公告)日：1999-04-22
申请号：DE69227570
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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Patent Agency Ranking
公开(公告)号：AU5970598A
公开(公告)日：1998-10-01
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：TR199800315A2
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
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：AU689506B2
公开(公告)日：1998-04-02
申请号：AU8067194
申请日：1994-11-04
Applicant: SONY CORP
Inventor： TSUTSUI KYOYA
Abstract: In an apparatus for, and a method of, encoding signals according to the present invention, a normalization coefficient for normalizing a first signal is set into a smaller interval then that of a normalization coefficient for normalizing a second signal. In other words, accuracy of the normalization coefficient at the time of normalization of a tone component is set to a higher level than that of the normalization coefficient at the time of normalization of a noise component. Accordingly, the present invention provides an efficient method of encoding. In other words, the present invention improves the accuracy of encoding of the tone component while restricting the number of bits necessary for encoding the noise component, thus improving the encoding efficiency as a whole. In the recording medium of the present invention, since signals efficiently encoded by the signal encoding apparatus or method of the present invention are recorded, a recording capacity can be effectively utilized. Further, because the signal decoder of the present invention decodes the signals encoded by the signal encoding apparatus or method of the present invention, signal error during decoding can be reduced.
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公开(公告)号：BR9506263A
公开(公告)日：1997-08-12
申请号：BR9506263
申请日：1995-06-12
Applicant: SONY CORP
Inventor： OIKAWA YOSHIAKI , TSUTSUI KYOYA , MIYAMORI SHINJI , UENO MASATOSHI
IPC: G10L19/00 , G10L19/02 , G10L19/032 , G10L19/14 , G10L25/00 , G11B20/10 , G11B20/24 , H04B1/66 , H04H5/00 , H03M7/30 , G10L7/04 , G10L9/18 , H04B14/04
Abstract: In a method and device for signal encoding according to this invention, a first encoder (124) separately encodes noise components of a plurality of channels and a second encoder (125) commonly encodes noise components of a plurality of channels. Then a discriminating means (123) detects the characteristics of the noise components and selects the output from either of the encoders (124 and 125) based on the discriminated results. When the noise components the compression ratio of the noise components of a plurality of channels can be increased. When the components are not commonly encoded, on the other hand, undesired effects of common encoding can be prevented.
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公开(公告)号：DE69219718D1
公开(公告)日：1997-06-19
申请号：DE69219718
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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