Record medium checking device including a circuit for recording

Details Record medium checking device including a circuit for recording Record medium checking device including a circuit for recording

1993-12-30

1997-01-07

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360 31, G01R 3312, G11B 2736

Patent

active

055920802

ABSTRACT:
In a record medium checking device, a signal recorded on record medium is reproduced, then the absence of reproduced signal is detected. The device includes a reproducing means for reproducing the signal recorded on the record medium to output the reproduced signal, a discriminating means for comparing the reproduced signal with a reference signal to output a discriminating signal, a signal generating means for generating detecting clock pulses, and a counter to count the detecting clock pulses. The output of the counter is a check signal based on the discriminating signal.

REFERENCES:
patent: 3071723 (1963-01-01), Gabor
patent: 4754222 (1988-06-01), Felleisen et al.
patent: 4929894 (1990-05-01), Monett
patent: 5087884 (1992-02-01), Brannon
patent: 5089757 (1992-02-01), Wilson
patent: 5247254 (1993-09-01), Huber et al.
IBM Technical Disclosure Bulletin, vol. 14, No. 9, Feb. 1972. pp. 2637-2638 .

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