Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1985-11-01
1987-03-03
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
360 77, G11B 5008
Patent
active
046479902
ABSTRACT:
A tracking control system comprises a capstan motor for moving a magnetic tape which is at least recorded with an FM signal and a control signal having a constant period, a driving circuit for generating a signal which drives the capstan motor, a control head for reproducing the control signal from the tape in a reproducing mode, heads for reproducing the FM signal from the tape in the reproducing mode, a tracking adjuster for generating a comparison signal, a phase comparator for comparing phases of the reproduced control signal with the comparison signal and for generating a phase error signal which is supplied to the driving circuit to control the driving circuit, a sampling circuit for sampling a signal which is based on the reproduced FM signal with a preset sampling interval, a discriminating circuit for discriminating levels of sampled data obtained from the sampling circuit, and a circuit for generating a control signal based on a discriminated result in the discriminating circuit and for supplying the control signal to the tracking adjuster to automatically and variably control a duty cycle of the comparison signal so that an envelope level of the reproduced FM signal becomes a maximum.
REFERENCES:
patent: 4210943 (1980-07-01), Nakamura et al.
patent: 4364097 (1982-12-01), De Boer et al.
patent: 4402023 (1983-08-01), Hiraguri
patent: 4494153 (1985-01-01), Ravizza
patent: 4549234 (1985-10-01), Sakamoto
Meller Michael N.
Stellar George G.
Victor Company of Japan Ltd.
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