Signal detection apparatus including maximum likelihood estimati

Details Signal detection apparatus including maximum likelihood estimati Signal detection apparatus including maximum likelihood estimati

1992-11-27

1994-10-11

Knepper, David D.

395 255, G10L 302

Patent

active

053554310

ABSTRACT:
A band division process including a Fourier transformation is performed for an inputted speech signal, thereby outputting spectrum signals of plural channels. A cepstrum analysis process is performed for the spectrum signals, and a peak of the obtained cepstrum is detected in response to the cepstrum analysis result. Thereafter, a speech signal interval of the inputted noisy speech signal is detected in response to the detected peak, and a noise is predicted in the speech signal in response to the detected speech signal interval. Then, the predicted noise is canceled in the spectrum signals thereby outputting noise-suppressed spectrum signals. Finally, the noise-suppressed spectrum signals are combined and are inverse Fourier-transformed, thereby outputting a noise-suppressed speech signal.

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