Rotation speed detection circuit in a video disc playback device

Details Rotation speed detection circuit in a video disc playback device Rotation speed detection circuit in a video disc playback device

1986-09-29

1989-04-18

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

369 53, 369 58, 369133, 369240, 360 7303, G11B 700

Patent

active

048232033

ABSTRACT:
A circuit in a video disc playback device for detecting a state in which a disc motor rotation speed is double a normal rotation speed comprises a counter for counting a signal occurring at a timing intermediate between windows established for a timing at which a horizontal synchronizing signal is expected to occur and a double speed judgement circuit receiving a count by this counter and produces a double speed detection signal when the count has reached a predetermined value within a certain fixed period. The double speed detection signal is utilized for preventing an erroneous switching between AFC and PLL in the disc motor control such as an erroneous switching from AFC mode to PLL mode with phase locking in a double rotation speed.

REFERENCES:
patent: 4416002 (1983-11-01), Oguino et al.
patent: 4707818 (1987-11-01), Suzuki et al.

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