Reproducing device of pal system color television signal

Abstract

Abstract PURPOSE:To obtain stable color picture even at fast speed reproduction by detecting a color burst signal representing the polarity of one color difference signal at two horizontal synchronizing periods and porforming color collation by a color collation circuit so as to compare the phase of the color burst signals at two horizontal synchronizing periods. CONSTITUTION:A unipolar color burst signal extracted from a burst gate circuit 34 by using an output of a 2H gate signal generating circuit 33 as a gate signal oscillates synchronizingly a crystal oscillating circuit 18, and its oscillated signal is fed to a pahse comparator circuit 20. The oscillated signal and the color burst signal have a prescribed phase difference normally and an output of the phase comparator circuit 20 is at low level so as to reset an RS flip-flop circuit 24. When the phase difference between the oscillated signal and the color burst signal is not within the prescribed phase difference, a high level output is transmitted from the phase comparator circuit 20 to set the Rs flip-flop circuit 24. Since a switch 5s is thrown the position of contact T1, the color signal output without delay is fed to an adder 6, where the signal is added to the luminance signal.

Inventors

• 👤 Masahiro Hashimoto
• 👤 橋本　正博

Bibliographic Details