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1. WO2002019318 - NOISE SUPPRESSOR AND NOISE SUPPRESSING METHOD

Publication Number WO/2002/019318
Publication Date 07.03.2002
International Application No. PCT/JP2001/007452
International Filing Date 30.08.2001
IPC
G10L 11/02 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
11Determination or detection of speech or audio characteristics not restricted to a single one of groups G10L15/-G10L21/155
02Detection of presence or absence of speech signals
G10L 21/02 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
21Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
02Speech enhancement, e.g. noise reduction or echo cancellation
CPC
G10L 2021/02168
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
21Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
02Speech enhancement, e.g. noise reduction or echo cancellation
0208Noise filtering
0216characterised by the method used for estimating noise
02168the estimation exclusively taking place during speech pauses
G10L 2025/783
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
25Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
78Detection of presence or absence of voice signals
783based on threshold decision
G10L 21/0208
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
21Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
02Speech enhancement, e.g. noise reduction or echo cancellation
0208Noise filtering
Applicants
  • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. [JP]/[JP] (AllExceptUS)
  • YOSHIDA, Koji [JP]/[JP] (UsOnly)
Inventors
  • YOSHIDA, Koji
Agents
  • WASHIDA, Kimihito
Priority Data
2000-26419631.08.2000JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) NOISE SUPPRESSOR AND NOISE SUPPRESSING METHOD
(FR) UNITE ET PROCEDE DE SUPPRESSION DU BRUIT
Abstract
(EN)
A voice/nonvoice judging section (103) makes a voice/nonvoice judgment about whether the voice spectrum is a voice section containing voice or a nonvoice section containing no voice but only noise. A noise spectrum inferring section (104) infers the noise spectrum on the basis of the voice spectrum judged to be a nonvoice section. An SNR estimating section (105) determines the voice signal power from the voice section of the voice spectrum and the noise signal power from the nonvoice section and calculates the SNR (signal noise ratio) from the ratio between the two values. A suppression coefficient control section (106) outputs a suppression coefficient upper limit to a spectrum subtracting section (107) according to the voice/nonvoice judgment and the SNR value. The spectrum subtracting section (107) subtracts the inferred noise spectrum from the inputted voice spectrum and outputs a voice spectrum where noise is suppressed.
(FR)
L'invention concerne une partie de jugement vocal/non vocal (103) qui émet un jugement vocal/non vocal quant à savoir si le spectre vocal est une partie vocale contenant de la voix ou une partie non vocale ne contenant que du bruit. Une partie de déduction du spectre de bruit (104) déduit le spectre de bruit sur la base du spectre vocal jugé comme étant une partie non vocale. Une partie d'estimation du rapport signal sur bruit (RSB) (105) détermine la puissance du signal vocal de la partie vocale du spectre vocal et la puissance du signal de bruit de la partie non vocale et calcule le RSB à partir du rapport entre les deux valeurs. Une partie de commande du coefficient de suppression (106) émet une limite supérieure du coefficient de suppression à une partie de soustraction du spectre (107) en fonction du jugement vocal/non vocal et de la valeur du RSB. La partie de soustraction du spectre (107) soustrait le spectre de bruit déduit à partir du spectre vocal introduit et émet un spectre vocal duquel le bruit est supprimé.
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