Playback system for video disk having plural information tracks

Claim 2

A playback system for a video disc which has first and second information tracks adjacently to each other, an FM signal frequency-modulated by a video information signal being recorded on said first information track and an FM signal frequency-modulated by an audio information signal being recorded on said second information track in a different frequency band from that for said FM signal on said first information track, comprising: stylus means for simultaneously tracing said first and second information tracks; signal detector means coupled to said stylus means for detecting the FM signal frequency-modulated by the audio information signal and the FM signal frequency-modulated by the video information signal; first and second filter means coupled to said signal detector means for separating the FM signal frequency-modulated by the audio information signal and the FM signal frequency-modulated by the video information signal included in the output signal of said signal detector means from each other; first and second rectifying circuit means connected respectively to said first and second filter means; voltage comparator circuit means connected to said first and second rectifying circuit means; tracking compensating means connected to said voltage comparator circuit means for restoring said stylus means to a correct tracing position thereof for said first and second information tracks when said stylus means is shifted from the correct tracing position; first FM demodulator circuit means connected to said first filter means for demodulating the audio information signal; and second FM demodulator circuit means connected to said second filter means for demodulating the video information signal.

Claim 3

A playback system for a video disc which has first and second information tracks adjacently to each other, an FM signal frequency-modulated by a chrominance information signal being recorded on said first information track and an FM signal frequency-modulated by a luminance information signal being recorded on said second information track in a different frequency band from that for said FM signal on said first information track, comprising: stylus means for simultaneously tracing said first and second information tracks; signal detector circuit means coupled to said stylus means for detecting the FM signal frequency-modulated by the chrominance information signal and the FM signal frequency-modulated by the luminance information signal; first and second filter means coupled to said signal detector circuit means for separating the FM signal frequency-modulated by the chrominance information signal and the FM signal frequency-modulated by the luminance information signal included in the output signal of said signal detector circuit from each other; first and second rectifying circuit means connected respectively to said first and second filter means; voltage comparator circuit means connected to said first and second rectifying circuit means; tracking compensating means connected to said voltage comparator circuit means for restoring said stylus means to a correct tracing position thereof relative to said first and second information tracks when said stylus means is shifted from the correct tracing position; and circuit means connected to said first and second filter means for combining the chrominance and luminance information signals into a form suited for reproduction on a color television set.

Claim 4

A playback system for a video disc which has first and second information tracks adjacently to each other, an FM signal frequency-modulated by a chrominance information signal being recorded on said first information track and an FM signal frequency-modulated by a luminance information signal being recorded on said second information track in a different frequency band from that for said FM signal on said first information track, comprising: stylus means for simultaneously tracing said first and second information tracks; signal detector circuit means coupled to said stylus means for detecting the FM signal frequency-modulated by the chrominance information signal and the FM signal frequency-modulated by the luminance information signal; first and second filter means coupled to said signal detector circuit means for separating the FM signal frequency-modulated by the chrominance information signal and the FM signal frequency-modulated by the luminance information signal included in the output signal of said signal detector circuit from each other; first and second rectifying circuit means connected respectively to said first and second filter means; voltage comparator circuit means connected to said first and second rectifying circuit means; tracking compensating means connected to said voltage comparator circuit means for restoring said stylus means to a correct tracing position thereof relative to said first and second information tracks when said stylus means is shifted from the correct tracing position; and circuit means connected to said first and second filter means for combining the chrominance and luminance information signals into a form suited for reproduction on a color television set.