U.S. Philips Corporation

Johannes C Van Lier

Robertus W Groen

Lawrence M Schwartz

Cornelis A De Jonge

A video disc is provided with tracks which are arranged in a plurality of sectors. The tracks in the sectors are divided into groups each containing an integral number of video fields recorded on an integral number of tracks. The tracks within a given sector are adapted to be played back at a constant angular velocity, with the angular velocity varying inversely with the radius from sector to sector.

Record carrier for storage of video information

In order to enable film frames of a film standard in which the number of film frames per second differs from the number of video pictures per second of the television standard in use with a gain of playing time, to allow still-picture operation on every turn, and to enable the picture numbers to be inserted on one radius, it is proposed to record one film frame as two video fields in every turn of the disc and to bring the number of video fields reproduced per second into conformity with the specified number of film frames per second by means of a pattern of forward and/or backward jumps effected during reproduction from the disc.

System for playing back a film recorded as a video signal on a

The invention relates to a video-disc player in which by controlling a pivotal mirror rapid jumps over a large number of tracks can be made substantially within the field-blanking interval. In order to minimize the picture disturbance the jump is always started at the instant at which the duration of the remaining period until just before the address code within the next field blanking interval is equal to the anticipated duration of the jump to be performed in particular by measuring the time which has elapsed since the previous read-out of an address code.

Growing community of inventors

Eindhoven, Netherlands

Johannes C Van Lier