Tape timing apparatus and method employing a phase comparison be

Details Tape timing apparatus and method employing a phase comparison be Tape timing apparatus and method employing a phase comparison be

1976-03-19

1977-12-06

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

G11B 1500

Patent

active

040620484

ABSTRACT:
A tape timer system is described for indicating the position of recording tape, moved longitudinally by a drive mechanism, relative to a tape head. Periodic first pulses are developed from the drive mechanism by a tachometer system and are used to operate a counter. The counter produces a series of sequences of count pulses, each count pulse being related to receipt of the first pulses. The phase of the count cycle of the counter is adjusted by comparing the phase of the first pulses with the phase of second pulses related to longitudinal spacing of recorded information on the tape (control track pulses). Information as to tape position is developed from the count pulse sequences which have been phase corrected as needed in accordance with the arrival of the second pulses.

REFERENCES:
patent: 3643012 (1972-02-01), Clark et al.
patent: 3651276 (1972-03-01), Clark
patent: 3764755 (1973-10-01), Yamashita
patent: 3787615 (1974-01-01), Foerster et al.
patent: 3852810 (1974-12-01), McGrath et al.

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