Noise suppressor for removing irregular noise

Details Noise suppressor for removing irregular noise Noise suppressor for removing irregular noise

2011-03-29

2011-03-29

Armstrong, Angela A (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

07917359

ABSTRACT:
A noise suppressor detects a peak position in the frequency spectrum of an input speech signal, and masks frequency components in the spectrum as a function of the peak position. The masking process attenuates or removes frequency components near the peak position if their magnitudes are significantly lower than the magnitude of the spectrum at the peak position. This noise suppressor effectively removes irregular noise from the spectrum while leaving enough of the spectrum to reproduce the speech signal clearly.

REFERENCES:
patent: 6138093 (2000-10-01), Ekudden et al.
patent: 7120579 (2006-10-01), Licht
patent: 2005/0288923 (2005-12-01), Kok
S. F. Boll, et al., “Suppression of Acoustic Noise in Speech Using Spectral Subtraction”, IEEE Trans., vol. ASSP-27, No. 2, Apr. 1979.
B. Widrow, et al., “Adaptive Noise Cancelling: Principles and Applications”, IEEE Proc., vol. 63, No. 12, Dec. 1975, pp. 1692-1716.

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