Noise reduction method

Details Noise reduction method Noise reduction method

2006-11-07

2006-11-07

Armstrong, Angela (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

07133824

ABSTRACT:
A noise reduction method partitions frequency band into multiple sub-bands and estimates the signal-to-noise ratio (SNR) value for each sub-band. An over-subtraction factor of each sub-band is determined based on the estimated SNR value. Then, the clean speech spectrum estimate is determined by performing spectral over-subtraction on each sub-band, so as to determine the clean speech signal from the estimated clean speech spectrum.

REFERENCES:
patent: 6678657 (2004-01-01), Bruckner et al.
M. Berouti, R. Schwartz, and J. Makhoul, “Enhancement of Speech Corrupted by Acoustic Noise”, 1979, pp. 208-211.
Kuo-Guan Wu and Po-Cheng Chen, “Efficient Speech Enhancement Using Spectral Subtraction for Car Hands-free Applications”, Jun. 19-21, 2001, pp. 220-221.
Elias Nemer, Rafik Goubran, And Samy Mahmoud, “SNR Estimation of Speech Signals Using Subbands and Fourth-Order Statistics”, Jul. 1999 IEEE, pp. 171-174.

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