Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1986-04-02
1987-06-09
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
360 60, 360 75, G11B 552, G11B 1502
Patent
active
046724753
ABSTRACT:
A portable video tape recorder includes a tachogenerator which generates an actual speed signal representative of the angular velocity of a video head and an actual phase signal representative of the angular position of the head. A frequency comparator generates a speed control signal representative of the deviation of the actual speed signal from a reference speed signal and a phase comparator generates a phase control signal representative of the deviation of the actual phase signal from a reference phase signal. The speed and phase control signals are summed and applied to the motor. A detector is provided for detecting when the deviation of the actual phase signal exceeds a predetermined level and generating a warning signal to alert the user either in visual or audible form to prevent external vibration from severely disturbing the angular position of the video head.
REFERENCES:
patent: 4325089 (1982-04-01), Hsu
patent: 4445145 (1984-04-01), Moriya
patent: 4573087 (1986-02-01), Tezuka et al.
Matsushita Electric - Industrial Co., Ltd.
Stellar George G.
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