| 摘要 |
Apparatus for controlling a visual display unit from a video signal which is present for a first period of time such that an image corresponding to the signal can be displayed for one or more further such periods. The apparatus stores a digital representation of the video signal which is used to enable the required image to persist for the one or more further periods. The apparatus also generates during the first period a correction signal which is combined with the video signal and used to compensate for any imprecision in the stored signal. This arrangement permits the use of relatively small storage devices and relatively simple analogue-to-digital converters.
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