Apparatus and method for removal of sinusoidal noise from a samp

Details Apparatus and method for removal of sinusoidal noise from a samp Apparatus and method for removal of sinusoidal noise from a samp

1981-05-18

1983-12-13

Malzahn, David H.

Boots, shoes, and leggings

G06F 1531

Patent

active

044208154

ABSTRACT:
An apparatus and method for removing signal frequency sinusoidal noise from an analog signal is disclosed. The filter apparatus utilizes A Programmable Gain Amplifier (PGA) as an input to a discrete sine wave generator to control the amplitude and phase of the discrete sine wave generator. The output of the latter, after being full live rectified, controls the gain of the PGA so that its output, when appropriately phase shifted, cancels sinusoidal noise from a sampled analog signal. The apparatus is particularly adapted to cancelling 60 cycle noise from electrocardiogram (ECG) signals. The filtering approach can be implemented on a programmed general purpose digital computer and the method steps for achieving filtering of single frequency noise from an analog signal are disclosed.

REFERENCES:
patent: 3780279 (1973-12-01), Stover
patent: 3894219 (1975-07-01), Weigel
patent: 4344150 (1982-08-01), McLaughlin
"Adaptive Noise Cancelling: Principles and Applications" by Widrow et al, Proceedings of the IEEE, vol. 23, No. 12, Dec. 1975, p. 1692.
"Digital Filters for ECG Signals" by D. W. Mortara, Computers in Cardiology, Sep. 29-Oct. 1, 1977, Rotterdam The Netherlands, p. 511.
"Device for Removal of Sinusoidal Noise from Sampled Signal" by D. B. Francis, IBM Technical Disclosure Bulletin, vol. 23, No. 7B, Dec. 1980, p. 3405.

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