Simplified noise suppression circuit

Details Simplified noise suppression circuit Simplified noise suppression circuit

2007-02-13

2007-02-13

Opsasnick, Michael N. (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S226000

Reexamination Certificate

active

09483569

ABSTRACT:
A system for reducing noise in an acoustical signal comprises a sampler (104) for obtaining discrete samples of the acoustical signal, an analog to digital converter (106), and a noise suppression circuit (108). The noise suppression circuit (108) selects a fixed number of samples. These samples are multiplied by a windowing function and the fast Fourier transform is computed to yield transformed windowed signals. A smoothed power estimate and a noise estimate are calculated. The noise estimate and the smoothed power estimate is used to calculate a gain function. A transformed speech signal is obtained by multiplying the gain function with the transformed windowed signal. Then, the inversed fast Fourier transform of the transformed speech signal is added to a portion of the speech signal of a previous frame.

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