Circuit and method for controlling speed and phase of VCR servo

Details Circuit and method for controlling speed and phase of VCR servo Circuit and method for controlling speed and phase of VCR servo

1995-04-13

1997-02-18

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 70, 360 7307, 360 7313, G11B 1546

Patent

active

056046480

ABSTRACT:
A circuit for controlling a speed and a phase of a VCR servo system includes a Control (CTL) signal generation section, a speed error detection section, a phase error detection section and a speed/phase control section. The phase error detection section has a recording phase error detector and a playback phase error detector. A CTL signal blank discrimination section inputs a CTL pulse from the playback phase error detector, discriminates a blank interval of a CTL signal based on the inputted CTL pulse, and outputs discrimination signal in accordance with the discriminated result. A first switching control section inputs the discrimination signal, an FF/REW mode signal, a recording mode signal and a tape type discriminating signal and performs a logical operation based on the inputted signals to output a first control signal. A second switching control section inputs a video tape loading signal, the FF/REW mode signal and the tape type discriminating signal and performs a logical operation based on the inputted signals to output a second control signal. A first switching section is operative in response to the first control signal and a second switching section is operative in response to the second control signal.

REFERENCES:
patent: 4672474 (1987-06-01), Rodal
patent: 4737868 (1988-04-01), Kimura et al.
patent: 5019923 (1991-05-01), Ogaki
patent: 5270884 (1993-12-01), Kim
patent: 5274514 (1993-12-01), Han

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