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公开(公告)号:CA2733453C
公开(公告)日:2014-10-14
申请号:CA2733453
申请日:2001-11-29
Applicant: PANASONIC CORP , NIPPON TELEGRAPH & TELEPHONE
Inventor: YASUNAGA KAZUTOSHI , MORII TOSHIYUKI , EHARA HIROYUKI , MANO KAZUNORI , HIWASAKI YUSUKE
Abstract: The present invention carries out pre-selection on many LPC codevectors stored in an LSF codebook 101 using a weighted Euclidean distortion as a measure and carries out a full-code selection on the LPC codevectors left after the pre-selection using an amount of distortion in a spectral space as a measure. This makes it possible to improve the quantization performance of the LPC parameter vector quantizer and improve the quality of synthesized speech of the speech coder/decoder.
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公开(公告)号:BRPI0808705A2
公开(公告)日:2014-09-09
申请号:BRPI0808705
申请日:2008-02-29
Applicant: PANASONIC CORP
Inventor: OSHIKIRI MASAHIRO , YAMANASHI TOMOFUMI , MORII TOSHIYUKI
IPC: G10L19/005 , G10L19/02
Abstract: The speech encoding apparatus (220) has a first layer encoding section (2201), a first layer decoding section (2202), a delay section (2203), a subtracting section (104), a frequency domain transforming section (101), a second layer encoding section (105) and a multiplexing section (106).
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公开(公告)号:DK2320416T3
公开(公告)日:2014-05-26
申请号:DK09804758
申请日:2009-08-07
Applicant: PANASONIC CORP
Inventor: YAMANASHI TOMOFUMI , OSHIKIRI MASAHIRO , MORII TOSHIYUKI , EHARA HIROYUKI
IPC: G10L19/02 , G10L19/032 , G10L19/24 , G10L21/02
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14.
公开(公告)号:CZ304196B6
公开(公告)日:2013-12-27
申请号:CZ20031500
申请日:2001-11-29
Applicant: PANASONIC CORP , NIPPON TELEGRAPH & TELEPHONE
Inventor: YASUNAGA KAZUTOSHI , MORII TOSHIYUKI , EHARA HIROYUKI , MANO KAZUNORI , HIWASAKI YUSUKE
IPC: G10L19/06 , G10L19/038 , G10L19/07 , H03M7/30
Abstract: Vektorové kvantizační zařízení LPC parametru obsahuje první výpočetní jednotku (102) pro vypočtení zkreslení (d.sub.m.n.) mezi souborem kódových vektorů (LSF.sub.m.n.[i]) postupně přečtených z kódového seznamu (101) pro uložení početného souboru kódových vektorů (LSF.sub.m.n.[i]), a kvantizačním cílem (LSF.sub.T.n.[i]) za použití prvního měřítka pro vyhodnocení zkreslení; předvolbovou jednotku (103) pro předběžné zvolení kódových vektorů (LSF.sub.Ncand[j].n.[i]), které zmenšují velikost zkreslení (d.sub.m.n.), z uvedeného početného souboru kódových vektorů (LSF.sub.m.n.[i]) podle uvedeného prvního měřítka pro vyhodnocení zkreslení; druhou výpočetní jednotku (108) pro vypočtení zkreslení (D.sub.j.n.) mezi předběžně zvolenými kódovými vektory (CEP.sub.Ncand[j].n.[i]) a uvedeným kvantizačním cílem (CEP.sub.T.n.[i]) za použití druhého měřítka pro vyhodnocení zkreslení, které je odlišné od prvního měřítka pro vyhodnocení zkreslení, a pro specifikování kódového vektoru (N.sub.cand.n.[J]), který minimalizuje velikost zkreslení (D.sub.j.n.), z předběžně zvolených kódových vektorů (CEP.sub.Ncand[j].n.[i]) podle druhého měřítka pro vyhodnocení zkreslení a pro výstup indexové informace (J) specifikovaného kódového vektoru (N.sub.cand.n.[J]). Kodér řeči obsahuje vektorové kvantizační zařízení LPC parametru. Vysílací zařízení signálu řeči je opatřené kodérem řeči obsahujícím vektorové kvantizační zařízení LPC parametru.
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公开(公告)号:AT528750T
公开(公告)日:2011-10-15
申请号:AT10003491
申请日:2007-05-09
Applicant: PANASONIC CORP
Inventor: YAMANASHI TOMOFUMI , SATO KAORU , MORII TOSHIYUKI
IPC: G10L21/02 , G10L19/02 , G10L21/038 , H03M7/30
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公开(公告)号:DE602007005630D1
公开(公告)日:2010-05-12
申请号:DE602007005630
申请日:2007-05-09
Applicant: PANASONIC CORP
Inventor: YAMANASHI TOMOFUMI , SATO KAORU , MORII TOSHIYUKI
IPC: G10L19/14 , G10L19/02 , G10L21/02 , G10L21/038 , H03M7/30
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公开(公告)号:DE69840855D1
公开(公告)日:2009-07-09
申请号:DE69840855
申请日:1998-10-22
Applicant: PANASONIC CORP
Inventor: YASUNAGA KAZUTOSHI , MORII TOSHIYUKI
IPC: G10L19/10 , G10L19/107 , G10L19/12
Abstract: A vector quantizer and corresponding method for coding a linear prediction coefficients vector by muIti-stage vector quantization, the apparatus comprising: a first codebook that stores a plurality of first code vectors; a second codebook that stores a plurality of second code vectors; a storing section that stores a plurality of scalars; a first quantizing section that extracts a first code vector stored in the first codebook and performs first stage quantization for quantizing a target vector using the first code vector; a second quantizing section that extracts a second code vector stored in the second codebook, calculates a third code vector by multiplying the second code vector and one of the scalars stored in the storing section, performs distance calcutation using the target vector, the first code vector and the third code vector, and performs second stage quantization for quantizing the target vector using a result of the distance calculation, wherein each scalar stored in the storing section is associated with at least one of the first code vectors stored in the first codebook.
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公开(公告)号:CA2679192A1
公开(公告)日:2008-10-09
申请号:CA2679192
申请日:2008-02-29
Applicant: PANASONIC CORP
Inventor: OSHIKIRI MASAHIRO , YAMANASHI TOMOFUMI , MORII TOSHIYUKI
IPC: G10L19/005 , G10L19/02
Abstract: Disclosed is an encoding device which can accurately specify a band havin g a large error among all the bands by using a small calculation amount. The device includes: a first position identification unit (201) which uses a fi rst layer error conversion coefficient indicating an error of decoding signa l for an input signal so as to search for a band having a large error in a r elatively wide bandwidth in all the bands of the input signal and generates first position information indicating the identified band; a second position identification unit (202) which searches for a target frequency band having a large error in a relatively narrow bandwidth in the band identified by th e first position identification unit (201) and generates second position inf ormation indicating the identified target frequency band; and an encoding un it (203) which encodes a first layer decoding error conversion coefficient c ontained in the target frequency band. The first position information, the s econd position information, and the encoding unit are transmitted to a commu nication partner.
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公开(公告)号:CA2722110C
公开(公告)日:2014-04-08
申请号:CA2722110
申请日:2000-08-23
Applicant: PANASONIC CORP
Inventor: YASUNAGA KAZUTOSHI , MORII TOSHIYUKI
IPC: G10L19/12 , G10L19/083 , G10L19/09 , G10L19/16
Abstract: A CELP-based speech encoder that performs encoding by decomposing one frame into a plurality of subframes, comprising LPC synthesizing means for obtaining two synthesized speeches by filtering an adaptive excitation vector and a stochastic excitation vector using LPC coefficients obtained from an input speech, gain calculating means for calculating gains of the adaptive excitation vector and the stochastic excitation vector, parameter coding means, pitch analyzing means for performing pitch analyses, and search range setting means for determining lag search ranges. Also provided is a CELP-based speech encoding method and computer-readable recording medium storing a machine-executable speech encoding program.
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公开(公告)号:BRPI0720266A2
公开(公告)日:2014-01-28
申请号:BRPI0720266
申请日:2007-12-12
Applicant: PANASONIC CORP
Inventor: MORII TOSHIYUKI , OSHIKIRI MASAHIRO
IPC: G10L19/26
Abstract: Provided is an audio decoding device capable of obtaining a preferable synthesized sound with a stable sound volume. The audio decoding device includes: a post filter (210) which performs a process for improving subjective quality of audio and a process for improving subjective quality of a steady-state noise on an output signal of a synthesis filter (209); an amplitude ratio/change amount calculation unit (211) which calculates the amplitude ratio of the input signal and the output signal of the post filter (210) and calculates the fluctuation amount of the amplitude ratio for each of sub-frames; a smoothing coefficient setting unit (212) sets a smoothing coefficient on each of the sub-frames by using the amplitude ratio of the input signal and the output signal of the post filter (210) and the fluctuation amount of the amplitude ratio; an adjustment coefficient setting unit (213) which sets an adjustment coefficient for each sample by using the amplitude ratio of the input signal and the output signal of the post filter (210) and the smoothing coefficient; and a power adjusting unit (214) whichmultiplies the output signal of the post filter (210) by the adjustment coefficient so as to adjust the power of the output signal of the post filter (210).
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