Video disc player having timebase correction and constant angula

Details Video disc player having timebase correction and constant angula Video disc player having timebase correction and constant angula

1980-10-14

1983-03-15

Faber, Alan

Facsimile and static presentation processing

Facsimile

Recording apparatus

358321, 358338, 358342, 360 361, 369 43, H04N 576, G11B 2102

Patent

active

043769560

ABSTRACT:
The burst component of a video signal recovered from a video disc record is applied to a timebase correction servo for controlling the tangential position of the player pick-up transducer in a sense to minimize timebase errors. The record is rotated at a constant angular velocity whereby, for a given displacement of the pick-up transducer, the servo loop gain tends to vary with the radial position of the transducer which, in turn, undesirably influences the servo sensitivity and dynamic stability. A loop gain compensator, responsive to a second component of the recovered video signal proportional to the playing time of the disc, regulates the servo gain at a substantially constant value thereby improving the loop stability and sensitivity.

REFERENCES:
patent: 3711641 (1973-01-01), Palmer
patent: 3906152 (1975-09-01), Hoogendijk
patent: 3965482 (1976-06-01), Burrus
patent: 3967311 (1976-06-01), Fuhrer
patent: 3983318 (1976-09-01), Miller
patent: 4165495 (1979-08-01), Takahashi

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