Noise signal prediction system

Details Noise signal prediction system Noise signal prediction system

1991-05-28

1994-03-15

Fleming, Michael R.

395 262, G10L 900

Patent

active

052952258

ABSTRACT:
A noise signal prediction system includes a signal detector for receiving a mixed signal having a voice signal and a background noise signal and for detecting the presence and absence of the voice signal contained in the mixed signal. A noise level detector is provided for detecting an actual noise level at each sampling cycle during the absence of the voice signal. A storing circuit stores the noise levels for a predetermined number of past sampling cycles. A predicting circuit predicts a noise level of a next sampling cycle based on the stored noise levels in the storing circuit. The storing circuit receiving and stores the actual noise levels during the absence of the voice signal, but stores the predicted noise levels during the presence of the voice signal.

REFERENCES:
patent: 4628529 (1986-12-01), Borth et al.
"Cepstrum Pitch Determination", A. Michael Noll, The Journal of Acoustical Society of America, Aug. 1966, pp. 293-309.
"Suppression of Acoustic Noise in Speech Using Spectral Subtraction", Steven F. Boll, Member, IEEE Transactions On Acoustics, Speech, and Signal Processing, vol. ASSP-27, Apr. 1979.
"Adaptive Processing with Feature Extraction to Enhance the Intelligibility of Noise-Corrupted Speech", Conway et al., IECON '87, pp. 997-1002.

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