Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1982-09-02
1984-12-04
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
360 103, G11B 1544, G11B 2104
Patent
active
044867948
ABSTRACT:
A head servo circuit in a magnetic reproducing apparatus comprising rotary heads for reproducing a video signal recorded on tracks formed obliquely with respect to the longitudinal direction of a magnetic tape, a motor for rotating the rotary heads, and a magnetic tape traveling circuit for causing the magnetic tape to travel at a high speed during a high-speed reproduction mode and causing the magnetic tape to travel at a speed in accordance with a mode as the mode is switched over to a mode other than the high-speed reproduction mode, comprises a detecting circuit for detecting the rotation of the motor and producing a signal in accordance with the detected rotation, a reference frequency signal generating circuit for generating a reference frequency signal, a phase comparing circuit for comparing phases of the reference frequency signal generated by the reference frequency signal generating circuit and the signal from the detecting circuit, a control circuit for controlling the rotation of the motor by an output signal of the phase comparing circuit during a mode other than the high-speed reproduction mode, a cut off circuit for cutting off the supply of the output signal of the phase comparing circuit to the control circuit during the high-speed reproduction mode, and a synchronizing circuit for obtaining phase synchronism between the reference frequency signal generated by the reference frequency signal generating circuit and the signal from the detecting circuit during the high-speed reproduction mode.
REFERENCES:
patent: 3270130 (1966-08-01), Hurst et al.
patent: 3398235 (1968-08-01), Baldwin et al.
patent: 3729583 (1973-04-01), Yano
Meller Michael N.
Stellar George G.
Victor Company of Japan Ltd.
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