Process and device for blind equalization of the effects of a transmission channel on a digital speech signal
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United States of America Patent
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Dec 5, 2000
Grant Date -
N/A
app pub date -
Jul 20, 1998
filing date -
Jul 22, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process and device for blind equalization of the effects of a transmission channel on a speech signal. The speech signal is transformed into cepstral vectors which are representative of the speech signal over a given horizon. A reference cepstrum consisting of a constant cepstrum signal representative of the long-term cepstrum of the speech signal is calculated for each cepstral vector. Each of the cepstral vectors is subjected to adaptive filtering by LMS on the basis of the reference cepstrum so as to generate a set of equalized cepstral vectors on the basis of the calculation of an error signal between the reference cepstrum and equalized cepstral vectors. The error signal is expressed as the difference between the reference cepstrum component of a given rank and the component of the same rank of the equalized cepstral vector.
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