Video disc apparatus for clearing foreign matter from the signal

Details Video disc apparatus for clearing foreign matter from the signal Video disc apparatus for clearing foreign matter from the signal

1980-03-07

1982-05-18

Konick, Bernard

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 71, 369 72, 369126, G11B 358

Patent

active

043308813

ABSTRACT:
Accumulated foreign material on the signal pickup stylus of a video disc player tends to degrade the quality of the recovered information signal. The recovered information signal is detected and the nominal amplitude of the recovered signal is compared against a reference amplitude. The occurrence of a decrease in recovered signal amplitude below the level of the reference causes a comparator to generate a control or trigger pulse. The control pulse activates a pulse generator to produce a predetermined pulse sequence which is applied to a stylus deflection transducer to move the stylus fore and aft radially across the disc and thereby dislodge the foreign material from the pickup stylus.

REFERENCES:
patent: 1335352 (1920-03-01), Slowey
patent: 2310275 (1943-02-01), Beebe
patent: 2955825 (1960-10-01), Staar
patent: 3162445 (1964-12-01), Henry
patent: 3266807 (1966-08-01), Antwerp
patent: 3731317 (1973-05-01), deBruyne
patent: 3881734 (1975-05-01), Leedom
patent: 4080625 (1978-03-01), Kawamoto et al.
patent: 4166623 (1979-09-01), Nanbu et al.
patent: 4173348 (1979-11-01), Dholakia
J. K. Clemens, "Capacitive Pickup and the Buried Subcarrier Encoding System for the RCA Video Disc", RCA Review. vol. 39, Mar. 1978, pp. 33-59.

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