APPARATUS FOR COMPENSATING THE WAVE OF OSD PICTURE OPERATING SPECIAL FUNCTIONS

A jitter compensating device for an on-screen display (OSD) of a picture reproducing apparatus which performs a normal-play mode and a special-play mode includes a compensating vertical synchronous signal generator for receiving a vertical synchronous signal provided from a synchronous signal separator, and for generating a compensating vertical synchronous signal during a period when a dropout occurs. A switching portion selectively outputs either the vertical synchronous signal, provided from the synchronous signal separator, or the compensating vertical synchronous signal provided from the compensating vertical synchronous signal generator based upon a signal from a controller which controls the switching portion according to the normal-play mode or the special-play mode. The OSD processor operates according to the vertical synchronous signal when in the normal-play mode, and according to the compensating vertical synchronous signal when in the special-play mode. Therefore, the jitter of the OSD screen during the special-play mode can be prevented, improving reliability of the product.