EP 0918317 B1 20030827 - Frequency filtering method using a Wiener filter applied to noise reduction of audio signals
Title (en)
Frequency filtering method using a Wiener filter applied to noise reduction of audio signals
Title (de)
Verfahren zur Frequenzfilterung mittels eines Wiener Filters für die Geräuschunterdrückung von Audiosignalen
Title (fr)
Procédé de filtrage fréquentiel appliqué au débruitage de signaux sonores mettant en oeuvre un filtre de Wiener
Publication
Application
Priority
FR 9714641 A 19971121
Abstract (en)
[origin: EP0918317A1] The noisy signal is converted into the frequency domain by Fourier analysis (1). A model is created of the noise (2) and estimates made of the spectral density, energy level and the conversion coefficient for statistical dispersion. In parallel to this similar estimates are made of the noisy signal (3). The two results are then recombined in a Wiener filter (4) which compensates for energy levels and applies noise overestimation. The signal is then reconstructed (5).
IPC 1-7
IPC 8 full level
G10L 15/20 (2006.01); G10L 21/02 (2006.01); H03H 17/02 (2006.01); H04B 1/10 (2006.01)
CPC (source: EP US)
G10L 21/0208 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0918317 A1 19990526; EP 0918317 B1 20030827; DE 69817507 D1 20031002; FR 2771542 A1 19990528; FR 2771542 B1 20000211; JP H11265198 A 19990928; US 6445801 B1 20020903
DOCDB simple family (application)
EP 98402894 A 19981120; DE 69817507 T 19981120; FR 9714641 A 19971121; JP 33331998 A 19981124; US 19613898 A 19981120