Noise suppressing apparatus and noise suppressing method

Details Noise suppressing apparatus and noise suppressing method Noise suppressing apparatus and noise suppressing method

2006-05-30

2006-05-30

Hudspeth, David (Department: 2655)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S227000, C704S233000

Reexamination Certificate

active

07054808

ABSTRACT:
Speech
on-speech determining section103makes a speech
on-speech determination of whether a speech spectrum is of a speech interval with a speech included or of a non-speech interval with only a noise and no speech included. Noise spectrum estimating section104estimates a noise spectrum based on the speech spectrum determined as the non-speech interval. SNR estimating section105obtains speech signal power from the speech interval and noise signal power from the non-speech interval in the speech spectrum, and calculates SNR from a ratio of two values. Based on the speech
on-speech determination and a value of SNR, suppression coefficient control section106outputs a suppression lower limit coefficient to spectrum subtraction section107. Spectral subtraction section107subtracts an estimated noise spectrum from the input speech spectrum, and outputs a speech spectrum with a noise suppressed.

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