Abstract: In order to eliminate a crosstalk component of the reproduction signal and to provide a high level of recording density, a method for recording an information signal having a synchronizing signal on a recording disc comprises a first step for forming a first portion of recording tracks in which information signal is recorded on the recording disc rotated at a constant angular velocity of rotation so that positions of the recording tracks in which the synchronizing signal is recorded are aligned in radial directions of the recording disc, and a second step for forming second portions of recording tracks in which the information signal is recorded on the recording disc under a condition that the angular velocity of the rotation thereof is varying, wherein the first and second portions of the recording tracks are formed alternately.

Abstract: A system for recording stationary images on a convolution track of a video disk in which a stationary image video signal of at least one frame is optically recorded on the track every revolution of the disk. An audio signal is recorded on portions of the track corresponding to every predetermined number of lines of the video signal. The audio signals are time compressed and are recorded on respective portions of the track corresponding to a predetermined number of lines of the video signal. During the read-out, the audio signals are time expanded. The video signal is reproduced from the video signals recorded in lines immediately preceding the audio signals. In another embodiment the video signal is reproduced with the mean of the video signals immediately preceding and subsequent to lines where the audio signals are recorded.