Computationally efficient background noise suppressor for...

Details Computationally efficient background noise suppressor for... Computationally efficient background noise suppressor for...

2006-11-07

2006-11-07

Abebe, Daniel (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

C704S226000

Reexamination Certificate

active

07133825

ABSTRACT:
A noise suppressor for suppressing noise in a source speech signal, where a method utilized by the noise suppressor comprises calculating a signal-to-noise ratio in the source speech signal, calculating a background noise estimate for a current frame of the source speech signal based on said current frame and at least one previous frame and in accordance with the signal-to-noise ratio, wherein the calculating the signal-to-noise ratio is carried out independent from the background noise estimate for the current frame, and subtracting the background noise estimate from the source speech signal to produce a noise-reduced speech signal. The method may also comprise calculating an over-subtraction parameter based on the signal-to-noise ratio, calculating a noise-floor parameter based on the signal-to-noise ratio, wherein the subtracting uses the over-subtraction parameter and the noise-floor parameter to produce the noise-reduced speech signal.

REFERENCES:
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patent: 4811404 (1989-03-01), Vilmur et al.
patent: 5839101 (1998-11-01), Vahatalo et al.
patent: 6023674 (2000-02-01), Mekuria
patent: 6324502 (2001-11-01), Handel et al.

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