| 摘要 |
Image information recorded on a record medium such as a video disk is scanned in a search scan operation and the image information applied to the video screen is muted during time periods when the readout head of the device jumps between respective programs on the video disk. In addition, an image tracking device, which normally generates an image tracking difference signal, is inhibited during these jumping periods. The existence of a jumping operation is detected by the image tracking device, and the existence of an image difference signal above a predetermined reference level, indicates that the image tracking device has deviated from alignment with a recorded program. The inhibiting of the image difference signal and the muting of the image on the video screen are performed in synchronism with a vertical synchronizing signal of the video image display device. This sequence of operation ensures that a stable picture will exist on the video screen throughout the entire search scan operation including the periods wherein the readout transducer head is jumping from one program to another. That is, any noise that would normally result during the jumping periods will be blanked or muted and will not be visually perceivable on the video screen. Therefore, a person viewing the screen will not perceive any change in the image during the jump periods.
|
