The video and audio information is recorded along at least one track of the tape, which track, in the preferred embodiment of the invention, consists of discontinuous track segments oblique to the longitudinal axis of the tape, with portions of audio information alternating with portions of video information....http://www.google.com.hk/patents/US4353098?utm_source=gb-gplus-share專利 US4353098 - Method of storing digital color television signals on magnetic tape
