Method and apparatus for noise filtering

Details Method and apparatus for noise filtering Method and apparatus for noise filtering

2005-10-04

2005-10-04

Pendleton, Brian T. (Department: 2644)

Electrical audio signal processing systems and devices

Noise or distortion suppression

C381S094200, C381S092000

Reexamination Certificate

active

06952482

ABSTRACT:
Disclosed is an apparatus for and a method of filtering noise from a mixed sound signal to obtained a filtered target signal, comprising the steps of inputting the mixed signal through a pair of microphones into a first channel and a second channel, separately Fourier transforming each said mixed signal into the frequency domain, computing a signal short-time spectral amplitude |Ŝ| from said transformed signals, computing a signal short-time spectral complex exponential ei arg(S)from said transformed signals, where arg(S) is the phase of the target signal in the frequency domain, computing said target signal S in the frequency domain from said spectral amplitude and said complex exponential.

REFERENCES:
patent: 6717991 (2004-04-01), Gustafsson et al.
Ephraim, Yariv and Malah, David; “Speech Enhancement Using a Minimum Mean-Square Error Short-Time Spectral Amplitude Estimator”, IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 32 Dec. 1984 pp. 1109-1121.

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