Method, and apparatus and article of manufacture for filtering p

Details Method, and apparatus and article of manufacture for filtering p Method, and apparatus and article of manufacture for filtering p

1997-03-31

1999-03-23

Johns, Andrew W.

Image analysis

Applications

Reading bank checks

382320, G06K 900, G06K 720

Patent

active

058870750

ABSTRACT:
A method, apparatus and article of manufacture is disclosed for eliminating periodic noise detected by a magnetic read head. In particular a time varying signal electrical signal is provided by a magnetic read head. The signal is sampled and stored in memory. Samples known not to contain a desired signal are used to extract a waveform representative of a single period of periodic noise. The representative waveform is synchronized with samples containing the desired signal and used to compensate the samples containing the desired signal in order to minimize, reduce, cancel or remove the effects of the periodic noise on samples containing the periodic noise. The compensated samples are then processed to obtain information from the desired signals.

REFERENCES:
patent: 4245268 (1981-01-01), Toshimitsu
patent: 4797938 (1989-01-01), Will
patent: 4984117 (1991-01-01), Nolke et al.
patent: 5400409 (1995-03-01), Linhard
patent: 5495929 (1996-03-01), Batalianets et al.

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