Video disc playback apparatus with non-linear aperture correctio

Details Video disc playback apparatus with non-linear aperture correctio Video disc playback apparatus with non-linear aperture correctio

1979-09-19

1981-06-09

Cook, Daryl W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 8, 360 36, H04N 576, H04N 578

Patent

active

042727863

ABSTRACT:
In a video disc playback apparatus, a playback stylus is utilized for the recovery of information from prerecorded disc records. In one system, geometric variations are recorded on the surface of the record and are representative of recorded picture and sound information. As these geometric variations pass beneath the stylus, the capacitance between the stylus electrode and the surface of the disc varies in accordance with the recorded representations. The capacitive variations are converted to electrical signal variations in the playback apparatus. In such a video disc playback apparatus, sound interference in the video and video interference in the sound can be produced by the non-linearity of the aforementioned pickup stylus. Use of a non-linear aperture corrector between the pickup circuitry and the demodulator circuitry of the playback apparatus reduces these interferences.

REFERENCES:
patent: 3879748 (1975-04-01), DeBoer
patent: 3930117 (1975-12-01), Clemens et al.
patent: 3934263 (1976-01-01), Palmer
patent: 3984867 (1976-10-01), Harnandez
patent: 3988531 (1976-10-01), Laub
patent: 4124208 (1979-02-01), Oprandi et al.
patent: 4150395 (1979-04-01), Pritchard
patent: 4166251 (1979-08-01), Ishigaki et al.
"Gamma Correction", Colour Television, vol. 1, Principles and Practice, P. S. Carnt et al., London, ILIFFE, Ltd. (1961), pp. 84-86.
"Gamma Correction", Principles of Colour Television, by Hazeltine Laboratories Staff Editors, Knox McIlwain, E. E. et al., New York, John Wiley & Sons, Inc. (1956), pp. 124-127.

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