H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/01 (2006.01) G10L 21/02 (2006.01)
Patent
CA 2266654
The invention concerns a method and a device for blind equalizing of a transmission channel effects on a digital speech signal. The speech signal ({Sn(t)}) is transformed into (1000) cepstral vectors ({Cn(i)}). Each of the cepstral vectors is subjected to an adaptive filtering (1002), based on a reference spectrum ({Rn(i)}) (1001) representing the speech signal long term spectrum, to generate equalized cepstral signals ({Cn(i)}) representing an equalized speech signal. The invention is applicable to automatic speech recognition.
L'invention concerne un procédé et un dispositif d'égalisation aveugle des effets d'un canal de transmission sur un signal de parole. Le signal de parole ({S n(t)}) est transformé en (1000) en vecteurs cepstraux ({C n(i)}). Chacun des vecteurs cepstraux est soumis à un filtrage adaptatif (1002), à partir d'un cepstre de référence ({R n(i)})(1001) représentatif du cepstre à long terme du signal de parole, pour engendrer des vecteurs cepstraux égalisés ({C n(i)}) représentatifs d'un signal de parole égalisé. Application à la reconnaissance automatique de la parole.
Mauuary Laurent
Monne Jean
France Telecom
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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