Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1998-07-13
2000-03-28
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704233, 704227, H04B 1500
Patent
active
060443413
ABSTRACT:
A noise suppression apparatus of the present invention includes a voice
on-voice discriminator for discriminating a frame signal divided into frames having a predetermined length; a Fourier transform unit for converting a frame signal into a spectrum; a noise spectrum estimation unit for estimating a noise spectrum of a frame judged as a non-voice signal; an amplitude spectrum subtractor for subtracting the product of an estimated noise spectrum and a predetermined coefficient from a spectrum obtained by the transform unit; an auditory correction noise adder for adding aa auditory correction noise spectrum to a spectrum outputted from the subtractor; and an inverse Fourier transform unit for performing inverse Fourier transform to an output of the adder. The noise suppression apparatus further includes a negative amplitude value counter for counting the number of frequency components in an output of the subtractor whose amplitude values are negative; a subtraction coefficient setting unit for gradually decreasing a subtraction coefficient unit the counted value becomes not more than a predetermined value; an inverse Fourier transform unit for performing inverse Fourier transform to an output of the counter; and a noise spectrum estimation unit for calculating spectrum information of noise in the frame signal using different spectrum information according to the current type of frame signal.
REFERENCES:
patent: 5706394 (1998-01-01), Wynn
patent: 5757937 (1998-05-01), Itoh et al.
patent: 5774846 (1998-06-01), Morii
Abebe Daniel
Hudspeth David R.
Olympus Optical Co,. Ltd.
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