A rotary recording medium is recorded with an information signal including a video signal on a spiral track formed thereon in terms of a plurality of fields of the video signal in one track turn of the spiral track. The rotary recording medium is time-sequentially recorded with information signals related...http://www.google.fr/patents/US4563709?utm_source=gb-gplus-shareBrevet US4563709 - Rotary record having a spiral track with a video signal and two audio signals recorded thereon
Rotary record having a spiral track with a video signal and two audio ...
