H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/18
H04N 5/76 (2006.01) G11B 15/18 (2006.01) G11B 15/473 (2006.01)
Patent
CA 1182210
DRUM SERVO CONTROL ARRANGEMENT ABSTRACT OF THE DISCLOSURE 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 a reproduced synch signal picked up from the tape. A second phase comparator circuit provides a phase error signal in response to a comparison of phases of the reproduced synch signal and a 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. -1-
400277
Gowling Lafleur Henderson Llp
Sony Corporation
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