Drum servo control with reduced head phase error during editing

Details Drum servo control with reduced head phase error during editing Drum servo control with reduced head phase error during editing

1982-03-31

1985-07-09

Cardillo, Jr., Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 141, G11B 2104

Patent

active

045286035

ABSTRACT:
A head drum servo control arrangement is provided in a video tape recording and reproducing apparatus, for example, of the helical scan type, for reducing head phase error at the cut-in point on a magnetic tape during an electronic editing operation. A variable delay circuit imparts an adjustable delay to a detecting signal provided in response to rotation of the head drum. A first phase comparator circuit provides a drive control signal in response to a comparison of phases of the delayed detecting signal and an off-tape synch signal. A second phase comparator circuit provides a phase error signal in response to a comparison of phases of the reproduced synch signal and an off-tape synch signal derived from a video signal to be recorded during the editing operation. A phase control setting circuit, for example, an integrator, provides a phase control signal to the variable delay circuit in response to the phase error signal, while an offset circuit feeds back an adjusting signal to a subtracting circuit in advance of the integrator. This offset circuit can include an attenuator provided with the output of a level comparator having inputs respectively receiving the phase control signal and a reference level.

REFERENCES:
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patent: 4210943 (1980-07-01), Nakamura et al.
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patent: 4257073 (1981-03-01), Tatami
patent: 4268875 (1981-05-01), Morio et al.
patent: 4283671 (1981-08-01), Nakano et al.
patent: 4306254 (1981-12-01), Koda et al.
patent: 4322757 (1982-03-01), Hatakeyama
patent: 4390908 (1983-06-01), Nakamura et al.
patent: 4404601 (1983-09-01), Sakamoto

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