SYNCHRONIZING SIGNAL PRODUCING SYSTEM FOR A TELEVI

专利名称：SYNCHRONIZING SIGNAL PRODUCING

SYSTEM FOR A TELEVISION DEVICE

发明人：KOKADO N,JA申请号：US34769273申请日：19730404公开号：US3814855A公开日：19740604

摘要：A synchronizing signal producing system for a television device comprises a firstcounter for receiving input clock pulses having a frequency of an integral multiple of ahorizontal synchronizing signal to generate output pulses having a vertical synchronizingfrequency with a larger width than that of the clock pulse; a second counter for countingthe clock pulses in synchronization with the arrival of a vertical synchronizing signal fromthe outside; a comparison pulse generator coupled with the second counter so as toderive a clock pulse counted, by the second counter, at a time corresponding tosubstantially the center of the width of the output pulse from the first counter; a phasecomparator for comparing the phase of the output pulse from the comparison pulsegenerator with that of the output pulse from the first counter; and an output switchingcircuit for deriving as a vertical synchronizing output for the television device the outputpulse of the first counter when the output pulse from the first counter and that from thecomparison pulse generator are evaluated by the comparator to be in phase and theoutput pulse associated synchronously with the vertical synchronizing signal obtainedfrom the outside through the second counter when they are evaluated by thecomparator to be out of phase, whereby the television device can be driven always in

substantially synchronized condition not only in a case where the vertical synchronizingsignal from the outside is equal in frequency to a standard vertical synchronizing signal,but also in a case where the received vertical synchronizing signal is somewhat different infrequency from the standard vertical synchronizing signal.

申请人：TOKYO SHIBAURA ELECTRIC CO LTD,JA

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