EP 1016072 A1 20000705 - METHOD FOR SUPPRESSING NOISE IN A DIGITAL SPEECH SIGNAL
Title (en)
METHOD FOR SUPPRESSING NOISE IN A DIGITAL SPEECH SIGNAL
Title (de)
VERFAHREN ZUR RAUSCHUNTERDRÜCKUNG EINES DIGITALEN SPRACHSIGNALS
Title (fr)
PROCEDE DE DEBRUITAGE D'UN SIGNAL DE PAROLE NUMERIQUE
Publication
Application
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
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)
Citation (search report)
See references of WO 9914738A1
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