Electrical audio signal processing systems and devices – Noise or distortion suppression
Reexamination Certificate
2006-05-30
2006-05-30
Le, Huyen (Department: 2644)
Electrical audio signal processing systems and devices
Noise or distortion suppression
C381S094300, C381S094200, C704S226000, C704S211000
Reexamination Certificate
active
07054454
ABSTRACT:
A method and apparatus for de-noising weak bio-signals having a relatively low signal to noise ratio utilizes an iterative process of wavelet de-noising a data set comprised of a new set of frames of wavelet coefficients partially generated through a cyclic shift algorithm. The method preferably operates on a data set having 2Nframes, and the iteration is performed N−1 times. The resultant wavelet coefficients are then linearly averaged and an inverse discrete wavelet transform is performed to arrive at the de-noised original signal. The method is preferably carried out in a digital processor.
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Causevic Eldar
Causevic Elvir
Wickerhauser Mladen Victor
Everest Biomedical Instruments Company
Faulk Devona E
Le Huyen
Thompson & Coburn LLP
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