METHOD AND APPARATUS FOR INDICATING THE PHASE DISPLACEMENT OF THE COLOR-SYNCHRONIZING SIGNAL OF A COLOR TELEVISION SIGNAL

摘要

One of the two differently directed modulating components are alternatingly suppressed during predetermined time intervals. Both components are traced superimposingly on the screen of an oscilloscope tube so that they appear simultaneously visible in a level oscillogram. The amplitude difference of the components appearing on the screen is a measure of the phase displacement. Adders combine the identifying pulses with the components of the video frequency color signals, and modulators modulate the resulting combined components onto the color carrier. After combining the outputs of the modulators in an adder, the combined signal is applied to an oscilloscope or viewing.