Title:
DETECTION CIRCUIT FOR TELEVISION SYNCHRONIZING SIGNAL
Document Type and Number:
Japanese Patent JPS5487110
Kind Code:
A
Abstract:
PURPOSE: To obtain the discrimination output of the presence of TV synchronizing signal, by picking up the TV synchronizing signal and performing the waveform treatment digitally.
CONSTITUTION: The TV synchronizing signal 1a is separated from the TV composite video signal 10a with the slice circuit 1, the astable multivibrator 2 performs rectangular wave oscillation in synchronizing with the signal 1a, the output pulse 2a is the signal 3a by being delayed 3, the sampling point is at low level with the sampling by means of the clock of signal 3a for the signal 1a in the sampling circuit 4, and the output signal 4a is obtained. On the other hand, if the signal 10a is absent, the signal 4a is at high level.
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Inventors:
TSUBOIKE MITSUYOSHI
Application Number:
JP15526577A
Publication Date:
July 11, 1979
Filing Date:
December 23, 1977
Export Citation:
Assignee:
NIPPON ELECTRIC CO
International Classes:
H04N5/04; H04N5/08; H04N5/44; (IPC1-7): H04N5/04; H04N5/08