Importance

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Abstract

The tape of a video cassette providing oblique recording tracks of a longitudinal sound track for relatively narrow-band sound and a control track for vertical scan frequency synchronizing signals, instead of being usable alternately either for recording stereo and other wide-band sound on the oblique tracks and for recording television signals with sound either on the oblique tracks or on the longitudinal sound track, can be used for noninterfering superposed recording of sound on the oblique tracks using the usual FM sound signal carriers and a full television signal with the related sound on the longitudinal track. This is possible because by first recording the sound program on the oblique tracks, a greater depth of penetration of magnetization of the magnetic tape is produced than takes place with the recording of video signals. In consequence, when a sound program has been recorded on the oblique tracks of a video tape, and it is desired to record a television program on the same tape without losing the sound program, the video recorder, upon sensing a presence of the sound program already there, is caused to disable its erase heads for the synchronizing and oblique tracks, to control the tape advance from the synchronizing signals already on the synchronizing track and to record the sound of the television signal on the longitudinal track. The video signal with its low depth of penetration in the magnetic record leaves the underlying sound recording available for playback independently of the television signal.

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First Claim