Analog recording system

Details Analog recording system Analog recording system

1982-01-18

1984-05-29

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Converting an analog signal to digital form for recording;...

G11B 500

Patent

active

044518587

ABSTRACT:
An arrangement for recording an analog signal onto magnetic tape in which the analog signal modulates a square wave bias field by moving the negative-going transition of the square wave so that the average of the positive portion and negative portion of the square wave, equals the instantaneous value of the analog signal. The period of the total square wave, is maintained constant. The analog signal is compared to a periodic triangular-shaped wave, in a comparator, and the output of the comparator becomes switched in polarity whenever the analog modulating signal is equal in value to the instantaneous value of the triangular wave. The point at which polarity is switched corresponds to an intersection of the analog signal superimposed on the triangular wave. The resultant modulated square wave is applied to a recording head.

REFERENCES:
patent: 3049698 (1962-08-01), Thompson et al.
patent: 3174141 (1965-03-01), Sullivan et al.
patent: 3185775 (1965-05-01), Camras
patent: 3376566 (1968-04-01), Coccagna
patent: 3651280 (1972-03-01), Streckman
patent: 3840890 (1974-10-01), Sonderland
patent: 4164763 (1979-08-01), Briccetti et al.
patent: 4251842 (1981-02-01), Iwasaki et al.

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