Time base correction of color video signal from playback apparatus

DETAILED DESCRIPTION Accordingly, it is an object of this invention to provide an improved arrangement for correcting or compensating for time base errors in a color video signal particularly when the latter has been recorded and reproduced with a so-called "heterodyne" or "color-under" arrangement.
More specifically, it is an object of this invention to cause the color burst contained in a composite color video signal obtained at the output of a playback apparatus having a heterodyne processor to coincide with an artificially derived off-tape sub-carrier developed in an associated time base corrector and being fed back to fthe heterodyne processor for determining the frequency reconverting signal in the latter.
In accordance with an aspect of this invention, the artificially derived off-tape sub-carrier developed in the time base corrector to establish the clocking rate for writing in the latter is also applied to the heterodyne circuit or processor of the playback apparatus through a variable phase-shifter which is controlled by a control signal or voltage from a phase comparator comparing the phase of the color burst signal in the reproduced composite color video signal at the output of the playback apparatus with the phase of the off-tape sub-carrier or carrier reference signal developed within the time base corrector.
The above, and other objects, features and advantages of the invention, will be apparent in the following detailed description of an illustrative embodiment which is to be read in connection with the accompanying drawings.