Apparatus for detecting information index signal from magnetic t

Details Apparatus for detecting information index signal from magnetic t Apparatus for detecting information index signal from magnetic t

1978-12-26

1980-03-25

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 723, G11B 1543

Patent

active

041953193

ABSTRACT:
An apparatus for detecting information index signal from magnetic tape comprises a tape take-up shaft driven for rotation at a uniform rate during a tape rewind or rapid advance to take up the magnetic tape on which a plurality of information items are recorded, a first pulse generator responsive to the rotation of the take-up shaft to produce reference pulses, a second pulse generator responsive to the rotation of a tape supply shaft which rotates as the tape runs to produce pulses at a rate which depends on the varying tape speed, a logic circuit for converting a ratio of the number of pulses generated per unit time by the pulse generators into a voltage value, a detecting head for detecting a signal-free area between adjacent information items recorded on the magnetic tape, a pulse counter for counting clock pulses during the time the signal-free area is being detected, and a comparator for converting the number of clock pulses counted into a corresponding voltage value and for producing a count signal for information retrieval upon coincidence between the both voltage values.

REFERENCES:
patent: 3609251 (1971-09-01), Ban
patent: 3723666 (1973-03-01), Ferrari
patent: 3893177 (1975-07-01), Takenaka

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