Playback system for video disk having plural information tracks

Details Playback system for video disk having plural information tracks Playback system for video disk having plural information tracks

1980-03-26

1983-07-05

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Recording apparatus

358312, 358330, 369 43, H04N 580, G11B 2110

Patent

active

043921604

ABSTRACT:
A video disc has first and second information tracks adjacently formed thereon, and first and second FM signals with different frequency bands are recorded on the first and second information tracks, respectively. A common stylus simultaneously traces the first and second information tracks, and a signal detector circuit coupled with the stylus detects the first and second FM signals. The first and second FM signals are separated by first and second filter circuits, and applied respectively to first and second rectifying circuits, where DC voltage signals corresponding to the carrier levels of the detected first and second FM signals are produced. These DC voltage signals are compared by a voltage comparator circuit to control a tracking compensating device. Demodulator circuits to demodulate the information signals recorded on the first and second information tracks are connected to the first and second filter circuits.

REFERENCES:
patent: 3363054 (1968-01-01), Mason
patent: 3371154 (1968-02-01), Frohbach et al.
patent: 3435135 (1969-03-01), Yasuoka et al.
patent: 3840893 (1974-10-01), Jacoby et al.
patent: 3864740 (1975-02-01), Sordello et al.
patent: 3911476 (1975-10-01), Keizer
patent: 3930117 (1975-12-01), Clemens et al.
patent: 4068258 (1978-01-01), Bied-Charreton et al.
patent: 4119812 (1978-10-01), Fox
patent: 4161752 (1979-07-01), Basilico
patent: 4208671 (1980-06-01), Ozawa et al.

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