System for separating speech from background noise

Details System for separating speech from background noise System for separating speech from background noise

1990-12-06

1994-06-07

Knepper, David D.

395 212, G10L 706, G10L 918

Patent

active

053197364

ABSTRACT:
A digital signal processing system provides to sequences of power spectra in each of two signal channels, one channel, termed the "speech" channel, containing speech and environmental noise and the other channel, termed the "reference" channel, containing primarily the same environmental noise. An adaptive filtering technique is employed using the power spectra in both channels when speech is not present in the speech channel to obtain a relationship between the environmental noise power spectra in the two channels. When speech is present in the speech channel, a prediction of the environmental noise power spectrum on that channel is obtained from the power spectrum of the noise on the reference channel and the relationship between the noise power spectra on the two channels previously obtained. Thus the noise power spectrum be extracted from the power spectrum of the speech and noise in the speech channel. The result is that the speech will be more easily recognizable by either human listeners or speech recognition systems.

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