Controlled return to A.C. digital magnetic and reproducing syste

Details Controlled return to A.C. digital magnetic and reproducing syste Controlled return to A.C. digital magnetic and reproducing syste

1982-01-15

1984-09-04

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 66, G11B 509, G11B 547

Patent

active

044700814

ABSTRACT:
The Controlled Return to A.C. (CRA) magnetic recording and reproducing system applies a high frequency erase signal continuously to the write head except at the detents. At the detents polarity controlled interruptions of the high frequency erase signal are embedded therein. A positive interruption, a negative interruption and the absence of an interruption provides a ternary recording capability at the detent. The high frequency erase signal is controlled in phase to provide polarity coherent interruptions. A CRA cell includes two controlled interruptions providing a mapping of three binary digits into two CRA digits. The controlled interruption results in an opposite polarity pulse pair upon readback.

REFERENCES:
patent: 2894796 (1959-07-01), Reynolds
patent: 4190868 (1980-02-01), Moulin

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