METHOD FOR ACQUIRING SOUND ENCODING PARAMETER, AND METHOD AND DEVICE FOR DECODING SOUND - Panasonic Mobile Communications Co., Ltd.

Title:

METHOD FOR ACQUIRING SOUND ENCODING PARAMETER, AND METHOD AND DEVICE FOR DECODING SOUND

Document Type and Number:

Japanese Patent JP3404350

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To make a voiced-unvoiced decision resistant to frequency spectrum noise, and to synthesize unvoiced sound having less calculation complexity.
SOLUTION: A window length is adaptively adjusted according to a sound fundamental frequency by an adaptive window processing part 101, and a spectrum of a sound segment is obtained by a spectrum calculation part 102. A spectrum power of the sound segment is calculated by a frame energy calculation part 103; a spectrum power of each frequency band dividing the frequency spectrum band is calculated by a band energy calculation part 104; an intensity and width of each harmonics are calculated by a band harmonics amplitude calculation part 106 and a band harmonics width calculation part 107; and the number of the harmonics is calculated by a band harmonics number calculation part 108, and based on these, a voiced sound intensity decision part 109 calculates a voiced sound intensity V[k] of each frequency band. A sound decoding part takes out a section equivalent to the frequency band corresponding to unvoiced sound from a symmetric random series and an asymmetric random series, and converts it into a time-domain signal by an inverse FFT, and then, obtains unvoiced sound of a frame length by linear interpolation.

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Inventors:

Teruo Fumoto
Seiji Sasaki

Application Number:

JP2000060932A

Publication Date:

May 06, 2003

Filing Date:

March 06, 2000

Export Citation:

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Assignee:

Panasonic Mobile Communications Co., Ltd.

International Classes:

G10L19/02; G10L13/00; G10L25/93; H03M7/30; H04B14/04; (IPC1-7): G10L19/02; H03M7/30; H04B14/04

Domestic Patent References:

JP7295593A
JP8272398A
JP10124092A
JP7261796A
JP62502572A

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