Speed deviation detector for servo controlled disc mastering tur

Details Speed deviation detector for servo controlled disc mastering tur Speed deviation detector for servo controlled disc mastering tur

1980-05-29

1982-02-16

Krawczewicz, Stanley T.

Electricity: measuring and testing

Electrical speed measuring

Speed comparing means

318608, 318628, 318638, 3581286, G01P 346

Patent

active

043161430

ABSTRACT:
Variations of the speed of a video disc mastering turntable which lie within the lock range of a phase-lock-loop turntable speed control servo are detected by sensing variations of the loop phase detector waveform symmetry. Speed error limits are established by pulse forming circuitry which continuously restarts a timing circuit in one mode of operation and allows the timing circuit to complete a timing cycle in another mode of operation. A further timing circuit is arranged to reject multiple indications of the same speed error whereby a single output indication is provided for all speed errors occurring in a certain time period.

REFERENCES:
patent: 3381085 (1966-04-01), Johnson et al.
patent: 3423524 (1969-01-01), Bradford
patent: 3965482 (1976-06-01), Burrus
patent: 3967311 (1976-06-01), Fuhrer
patent: 4021681 (1977-05-01), Miesterfeld
patent: 4031466 (1977-06-01), Krause et al.

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