Turnaround tape transport apparatus with compensation for head-t

Details Turnaround tape transport apparatus with compensation for head-t Turnaround tape transport apparatus with compensation for head-t

1986-06-27

1987-06-30

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

G11B 1554

Patent

active

046775021

ABSTRACT:
Tape flutter, caused by head-to-tape stick-slip action, is suppressed in tape transport apparatus of the turnaround type having a single, speed-regulated capstan for metering magnetic tape into and out of a magnetic transducer station. To that end, a low-inertia motor, coupled to a turnaround roller, includes a tachometer for monitoring the instantaneous speed of the roller, and thereby the speed of the capstan tape loop. A phase lock loop, coupled to the tachometer, produces a composite signal including a nominal component corresponding to a desired tape speed, and an error component corresponding to tape flutter in the capstan loop. A bandpass filter, coupling the output of the phase lock loop and the motor, causes the motor to adjust the speed of the turnaround roller in phase opposition to the error component, to thereby suppress flutter in the capstan tape loop.

REFERENCES:
patent: 3497158 (1970-02-01), Calaway
patent: 4091979 (1978-05-01), Browder

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