Method for detecting eccentricity in a video disc and in a video

Details Method for detecting eccentricity in a video disc and in a video Method for detecting eccentricity in a video disc and in a video

1981-12-21

1984-04-24

Faber, Alan

Facsimile and static presentation processing

Facsimile

Recording apparatus

360 331, 360 77, 369 44, 369111, 369 56, A04N 585, G11B 2110

Patent

active

044451440

ABSTRACT:
A method for detecting and measuring eccentricity in a video disc and a video disc player, in which a video signal representing a special eccentricity test pattern is recorded on a prescribed set of adjacent recording tracks on the disc. Each frame of the video signal is recorded on a separate track, and the successive frames exhibit a prescribed movement. During an eccentricity test, the player scans the disc at a fixed radius, so that eccentricity in either the disc or the player causes it to scan cyclically across a plurality of tracks during each disc revolution. The playback signal therefore includes segments of the signal recorded on each of the scanned tracks, the shape of the displayed test pattern indicates the magnitude of combined eccentricity of the disc and player.

REFERENCES:
patent: 3711640 (1973-01-01), Takano
patent: 3917902 (1975-11-01), Olson
patent: 4067044 (1978-01-01), Maeda
patent: 4158857 (1979-06-01), Hiraguri

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