Color burst phase detection system for use in a video disk player system
AssigneePioneer Electronic Corporation
InventorToru Akiyama
Life of this patent
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Abstract
A system for detecting an inversion of burst phase of a video signal, includes a reference color subcarrier signal generator for generating a reference color subcarrier signal whose frequency is equal to the frequency of the color burst signal of the video signal, and a phase comparator for comparing in phase the color burst signal of the video signal and the reference color subcarrier signal. When the level change in an output signal of the phase comparator exceeds a predetermined reference level, the system produces an indication signal indicating that the burst phase of the video signal is inverted.
Claims10
A color burst phase detection system comprising:
- input means for receiving a video signal including a color burst signal;
- reference color subcarrier signal generating means for generating a reference color subcarrier signal whose frequency is substantially equal to the frequency of said color burst signal;
- phase comparing means connected to said input means and said reference color subcarrier signal generating means, for phase comparing said color burst signal included in said video signal with said reference color subcarrier signal and producing a phase comparing signal;
- and
- detection means connected to said phase comparing means, for detecting a level change of said phase comparing signal and producing a burst phase inversion detection signal when said level change of said phase comparing signal exceeds a predetermined reference level.
A color burst phase detection system adapted for use in a video information reproducing system including a frame memory, a phase control circuit connected to said frame memory and a switch circuit for selectively supplying one of a video signal from the frame memory and a video signal through the phase control circuit, comprising:
- input means for receiving a video signal including a color burst signal from the frame memory of the video information reproducing system;
- reference color subcarrier signal generating means for generating a reference color subcarrier signal whose frequency is substantially equal to the frequency of said color burst signal;
- phase comparing means connected to said input means and said reference color subcarrier signal generating means, for phase comparing said color burst signal included in said video signal with said reference color subcarrier signal and producing a phase comparing signal;
- and
- detection means connected to said phase comparing means, for detecting a level change of said phase comparing signal and producing a burst phase inversion detection signal for controlling the switch circuit of the video information reproduction system when said level change of said phase comparing signal exceeds a predetermined reference level.
Dependencies are inferred from the claim text.