Global Patent Index - EP 1016072 B1

EP 1016072 B1 20020116 - METHOD AND APPARATUS FOR SUPPRESSING NOISE IN A DIGITAL SPEECH SIGNAL

Title (en)

METHOD AND APPARATUS FOR SUPPRESSING NOISE IN A DIGITAL SPEECH SIGNAL

Title (de)

VERFAHREN UND VORRICHTUNG ZUR RAUSCHUNTERDRÜCKUNG EINES DIGITALEN SPRACHSIGNALS

Title (fr)

PROCEDE ET DISPOSITIF DE DEBRUITAGE D'UN SIGNAL DE PAROLE NUMERIQUE

Publication

EP 1016072 B1 20020116 (FR)

Application

EP 98943999 A 19980916

Priority

  • FR 9801980 W 19980916
  • FR 9711643 A 19970918

Abstract (en)

[origin: FR2768547A1] The speech signal is divided into spectral component and estimated noise signals subtracted to provide noise-reduced output. The procedure comprises a spectral subtraction including a first subtraction stage in which note is taken of increased estimations (Bn,i) of spectral noise components. This allows production of spectral component (S2n,f) of a first noise-reduced signal. The process further includes the calculation of a masking curve (Mn,q) by applying an auditory perception model w.r.t. the spectral components of the first noise-reduced signal. A second subtraction stage starts with each spectral component of the speech signal in the frame. From each is subtracted a quantity which is dependent on parameters including a difference between the increased estimation of the spectral component corresponding to the noise and the calculated masking curve. The result of this is subject to a transformation into the time domain in order to construct a noise reduced speech signal.

IPC 1-7

G10L 21/02

IPC 8 full level

G10L 21/02 (2006.01); G10L 21/0208 (2013.01); G10L 21/0232 (2013.01); G10L 21/0264 (2013.01)

CPC (source: EP US)

G10L 21/0208 (2013.01 - EP US); G10L 21/0232 (2013.01 - EP US); G10L 21/0264 (2013.01 - EP US)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

FR 2768547 A1 19990319; FR 2768547 B1 19991119; AU 9168998 A 19990405; CA 2304571 A1 19990325; DE 69803203 D1 20020221; DE 69803203 T2 20020829; EP 1016072 A1 20000705; EP 1016072 B1 20020116; US 6477489 B1 20021105; WO 9914738 A1 19990325

DOCDB simple family (application)

FR 9711643 A 19970918; AU 9168998 A 19980916; CA 2304571 A 19980916; DE 69803203 T 19980916; EP 98943999 A 19980916; FR 9801980 W 19980916; US 50914500 A 20000605