Method of reading addresses on a magnetic recording medium and a

Details Method of reading addresses on a magnetic recording medium and a Method of reading addresses on a magnetic recording medium and a

1977-02-02

1979-01-09

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

360 48, G11B 509

Patent

active

041341384

ABSTRACT:
Items of information written in a binary code on a plurality of magnetic c tracks are read by a magnetic head. The address for each track is written in a reference zone having a plurality of cells equal to the number of bits in the address. A constant frequency cyclic reference signal H is divided by logic pulses from the head to produce a signal SYNCHRO. The bit of each address is determined by combining the SYNCHRO signals and a pulse representative of the binary value of each bit that depends on the temporal position of a pulse within a period of signal SYNCHRO. The number of cells is counted, each time a bit is determined. The address is sampled bit by bit and transferred to a storage member throughout the counting and sampling operations.

REFERENCES:
patent: 3281806 (1966-10-01), Lawrance et al.
patent: 3479664 (1969-11-01), Williams et al.
patent: 3656130 (1972-04-01), Bucklin, Jr. et al.

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