Color burst phase detection system for use in a video disk player system

DETAILED DESCRIPTION The present invention is made to avoid the above mentioned problem, and an object of the present invention is therefore to provide a burst phase detection system which is able to positively detect whether the burst phase is inverted or not, using a relatively simple circuit construction and without being affected by noises or the like.
Another object of the present invention is to provide a burst phase detection system suited for use in a video information playback system having a frame memory.
According to the present invention, a burst phase detection system for a video disk player system is constructed such that a phase comparison is performed between the color burst signal in the video format signal and a reference color subcarrier signal, and the occurence of an inversion of phase of the color burst signal is detected when magnitude of the change in the comparator output signal exceeds a predetermined reference level.
In a preferred embodiment of the present invention, a pair of phase comparators having different axes of phase detection are provided as means for phase comparing the color burst signal and the color subcarrier signal.
When a level change exceeding a predetermined reference level occurs in either one or both of output signals of these phase comparators, such a condition is detected as an indication of the inversion of the burst phase of the video signal.
Further scope and applicability of the present invention will become apparent from the detailed description given hereinafter.
However, it should be understood that the detailed description and specific examples, while indicating a preferred embodiment of the invention, are given by way of illustration only, since various changes and modifications within the sprit and scope of the invention will become apparent to those skilled in the art from this detailed description.