DIGITAL VERTICAL SYNCHRONIZING DEVICE

摘要

PURPOSE:To attain stabilization and rationalization of operation by processing a digital signal so as to obtain a vertical pulse in a television receiver. CONSTITUTION:A vertical synchronizing signal E is obtained from an inputted composite video signal and the signal E and an output G of a counter circuit synchronized with the signal E are applied to a control pulse generating circuit 7. The detected output is generated by adding both E, G and delayed at a delay means and when the added signal reaches a comparison level, the detected output is taken as a control pulse F to reset the counter circuit 6 and the pulse F is applied to a vertical pulse generating circuit 8. The vertical pulse generating circuit 8 generates a pulse of a prescribed pulse width based on the control pulse and the pulse is extracted as a vertical deflection pulse H. Thus, the vertical pulse is obtained by the digital signal processing.