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公开(公告)号：AT448539T
公开(公告)日：2009-11-15
申请号：AT05819447
申请日：2005-12-26
Applicant: PANASONIC CORP
Inventor： YOSHIDA KOJI , GOTO MICHIYO
IPC: G10L19/02 , G10L19/00 , G10L19/008 , G10L19/14
Abstract: There is provided an audio encoding device capable of generating an appropriate monaural signal from a stereo signal while suppressing the lowering of encoding efficiency of the monaural signal. In a monaural signal generation unit (101) of this device, an inter-channel prediction/analysis unit (201) obtains a prediction parameter based on a delay difference and an amplitude ratio between a first channel audio signal and a second channel audio signal; an intermediate prediction parameter generation unit (202) obtains an intermediate parameter of the prediction parameter (called intermediate prediction parameter) so that the monaural signal generated finally is an intermediate signal of the first channel audio signal and the second channel audio signal; and a monaural signal calculation unit (203) calculates a monaural signal by using the intermediate prediction parameter.
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公开(公告)号：AT442644T
公开(公告)日：2009-09-15
申请号：AT05774594
申请日：2005-08-24
Applicant: PANASONIC CORP
Inventor： GOTO MICHIYO , TEO CHUN WOEI , NEO SUA HONG , YOSHIDA KOJI
Abstract: Multichannel signal coding equipment is provided for presenting a high quality sound at a low bit rate. In the multichannel signal coding equipment (2), a down mix part (10) generates monaural reference channel signals for N number of channel signals. A coding part (11) codes the generated reference channel signal. A signal analyzing part (12) extracts parameters indicating characteristics of each of the N number of channel signals. An MUX part (13) multiplexes the coded reference channel signal with the extracted parameters.
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公开(公告)号：DE602005016130D1
公开(公告)日：2009-10-01
申请号：DE602005016130
申请日：2005-09-28
Applicant: PANASONIC CORP
Inventor： GOTO MICHIYO , YOSHIDA KOJI , EHARA HIROYUKI , OSHIKIRI MASAHIRO
Abstract: A scalable encoding device for realizing scalable encoding by CELP encoding of a stereo sound signal and improving the encoding efficiency. In this device, an adder and a multiplier obtain an average of a first channel signal CH1 and a second channel signal CH2 as a monaural signal M. A CELP encoder for a monaural signal subjects the monaural signal M to CELP encoding, outputs the obtained encoded parameter to outside, and outputs a synthesized monaural signal M′ synthesized by using the encoded parameter to a first channel signal encoder. By using the synthesized monaural signal M′ and the second channel signal CH2, the first channel signal encoder subjects the first channel signal CH1 to CELP encoding to minimize the sum of the encoding distortion of the first channel signal CH1 and the encoding distortion of the second channel signal CH2.
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公开(公告)号：AT545131T
公开(公告)日：2012-02-15
申请号：AT05820404
申请日：2005-12-26
Applicant: PANASONIC CORP
Inventor： YOSHIDA KOJI , GOTO MICHIYO
IPC: G10L19/14 , G10L19/00 , G10L19/008 , G10L19/24
Abstract: A sound coding device having a monaural/stereo scalable structure and capable of efficiently coding stereo sound even when the correlation between the channel signals of a stereo signal is small. In a core layer coding block (110) of this device, a monaural signal generating section (111) generates a monaural signal from first and second-channel sound signal, a monaural signal coding section (112) codes the monaural signal, and a monaural signal decoding section (113) greatest a monaural decoded signal from monaural signal coded data and outputs it to an expansion layer coding block (120). In the expansion layer coding block (120), a first-channel prediction signal synthesizing section (122) synthesizes a first-channel prediction signal from the monaural decoded signal and a first-channel prediction filter digitizing parameter and a second-channel prediction signal synthesizing section (126) synthesizes a second-channel prediction signal from the monaural decoded signal and second-channel prediction filter digitizing parameter.
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公开(公告)号：AT474311T
公开(公告)日：2010-07-15
申请号：AT06746967
申请日：2006-05-29
Applicant: PANASONIC CORP
Inventor： GOTO MICHIYO , YOSHIDA KOJI
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Patent Agency Ranking
公开(公告)号：DE602006010687D1
公开(公告)日：2010-01-07
申请号：DE602006010687
申请日：2006-05-11
Applicant: PANASONIC CORP
Inventor： TEO CHUN WOEI , NEO SUA HONG , YOSHIDA KOJI , GOTO MICHIYO
Abstract: A spectrum modifying method and the like wherein the efficiencies of the signal estimation and prediction can be improved and the spectrum can be more efficiently encoded. According to this method, the pitch period is calculated from an original signal, which serves as a reference signal, and then a basic pitch frequency (f 0 ) is calculated. Thereafter, the spectrum of a target signal, which is a target of spectrum modification, is divided into a plurality of partitions. It is specified here that the width of each partition be the basic pitch frequency. Then, the spectra of bands are interleaved such that a plurality of peaks having similar amplitudes are unified into a group. The basic pitch frequency is used as an interleave pitch.
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公开(公告)号：DE602006015461D1
公开(公告)日：2010-08-26
申请号：DE602006015461
申请日：2006-05-29
Applicant: PANASONIC CORP
Inventor： GOTO MICHIYO , YOSHIDA KOJI
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公开(公告)号：AT450032T
公开(公告)日：2009-12-15
申请号：AT06746262
申请日：2006-05-11
Applicant: PANASONIC CORP
Inventor： TEO CHUN WOEI , NEO SUA HONG , YOSHIDA KOJI , GOTO MICHIYO
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公开(公告)号：DE602005016571D1
公开(公告)日：2009-10-22
申请号：DE602005016571
申请日：2005-08-24
Applicant: PANASONIC CORP
Inventor： GOTO MICHIYO , TEO CHUN WOEI , NEO SUA HONG , YOSHIDA KOJI
Abstract: Multichannel signal coding equipment is provided for presenting a high quality sound at a low bit rate. In the multichannel signal coding equipment (2), a down mix part (10) generates monaural reference channel signals for N number of channel signals. A coding part (11) codes the generated reference channel signal. A signal analyzing part (12) extracts parameters indicating characteristics of each of the N number of channel signals. An MUX part (13) multiplexes the coded reference channel signal with the extracted parameters.
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公开(公告)号：AT440361T
公开(公告)日：2009-09-15
申请号：AT05787917
申请日：2005-09-28
Applicant: PANASONIC CORP
Inventor： GOTO MICHIYO , EHARA HIROYUKI , YOSHIDA KOJI , OSHIKIRI MASAHIRO
Abstract: A scalable encoding device for realizing scalable encoding by CELP encoding of a stereo sound signal and improving the encoding efficiency. In this device, an adder and a multiplier obtain an average of a first channel signal CH1 and a second channel signal CH2 as a monaural signal M. A CELP encoder for a monaural signal subjects the monaural signal M to CELP encoding, outputs the obtained encoded parameter to outside, and outputs a synthesized monaural signal M′ synthesized by using the encoded parameter to a first channel signal encoder. By using the synthesized monaural signal M′ and the second channel signal CH2, the first channel signal encoder subjects the first channel signal CH1 to CELP encoding to minimize the sum of the encoding distortion of the first channel signal CH1 and the encoding distortion of the second channel signal CH2.
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