G - Physics – 11 – B
Patent
G - Physics
11
B
352/15, 352/29.0
G11B 5/11 (2006.01) G06K 7/08 (2006.01)
Patent
CA 1325846
ABSTRACT Electronic data processing equipment for reading magnetically recorded information, particularly document processing systems, contain certain modular units which generate magnetic interference fields. These interference fields substantially influence the proper functioning of a magnetic read head. Accord- ingly, the present invention provides a device comprising a read head and a reference head combined as a read system wherein the read head and the reference head have the same mechanical and electrical characteristics. The two heads are switched together in a difference circuit, wherein the difference signal of the read head and of the reference head is formed from a two-fold inter- ference signal and a read signal. The difference signal at the output of the difference circuit is supplied to a read electronic circuit. The invention can operate accurately in the presence of magnetic interference fields and without the necessity of shielding the units generating such fields. A method is further provided which allows for an accurate determination of magnetically recorded information with a magnetic read head and which is not susceptible to interference by spurious interference fields. The method comprises combining a read head and reference head as previously described, deriving electrical signals from each head and feeding the signals to respective amplifiers. The outputs of the respect- ive amplifiers are compared and the interference signals are eliminated from the read signal in the output of a signal amplifier.
579351
Dyma Horst
Ketterer Gunter
Nolke Gunter
Fetherstonhaugh & Co.
Mannesmann Aktiengesellschaft
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