SPEECH ENCODING DEVICE, SPEECH DECODING DEVICE, SPEECH ENCODING METHOD, SPEECH DECODING METHOD, SPEECH ENCODING PROGRAM, AND SPEECH DECODING PROGRAM

WIPO Patent Application WO/2010/114123

A1

With respect to a signal represented in a frequency domain, a linear prediction analysis is performed in the frequency direction according to a covariance method or an autocorrelation method to obtain a linear prediction coefficient, filter strength is adjusted to the linear prediction coefficient obtained, and then the time envelope of the signal is transformed by filtering the signal in the frequency direction with the coefficient after adjustment. Thus, in a band extension technique in the frequency domain represented by SBR, pre-echo/post-echo which may occur is reduced without a significant increase in bit rate, whereby the subjective quality of a decoding signal can be improved.

TSUJINO KOSUKE (JP)
KIKUIRI KEI (JP)
NAKA NOBUHIKO (JP)

PCT/JP2010/056077

October 07, 2010

April 02, 2010

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NTT DOCOMO INC (JP)
TSUJINO KOSUKE (JP)
KIKUIRI KEI (JP)
NAKA NOBUHIKO (JP)

G10L19/02; G10L19/032; G10L21/0388

WO2008046505A1

2008-04-24

JP2008535025A	2008-08-28
JP2005521907A	2005-07-21
JP2008513848A	2008-05-01
JP3871347B2	2007-01-24
JP2008536183A	2008-09-04
US20060239473A1	2006-10-26

TAKEHIRO MORIYA: "Audio Coding Technologies and the MPEG Standards", THE JOURNAL OF THE INSTITUTE OF ELECTRICAL ENGINEERS OF JAPAN, vol. 127, no. 7, 1 July 2007 (2007-07-01), pages 407 - 410, XP008166927
See also references of EP 2416316A4

HASEGAWA, Yoshiki et al. (JP)
Yoshiki Hasegawa (JP)

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