| 摘要 |
A picture display apparatus for displaying a picture by using a composite signal including tri-state binary synchronizing signals. A first horizontal synchonizing signal comprising a positive-polarity bilevel (the two-state) signal is generated by detecting a negative-polarity peak portion of an input composite picture signal to accomplish the horizontal synchronization of a picture by use of the first horizontal synchronizing signal whereby when the horizontal synchronization is stabilized, an output pulse produced from the first horizontal synchronizing signal is utilized to extract the tri-state binary horizontal synchronizing signal from the composite picture signal during the time of the output pulse thereby accomplishing horizontal synchronization of the picture by the tri-state binary horizontal synchronizing signal in the stable condition.
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