METHOD AND DEVICE FOR BLIND EQUALIZING OF TRANSMISSION CHANNEL EFFECTS ON A DIGITAL SPEECH SIGNAL

摘要

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.