Television apparatus

Claim 1

IN APPARATUS FOR THE SYNCHRONISING OF TELEVISION CAMERA CONTROL SIGNALS, A REMOTE CONTROL UNIT HAVING A TERMINAL ADAPTED TO RECEIVE INPUT PULSES FROM A MASTER SYNCHRONISING PULSE GENERATOR, A MONOSTABLE MULTIVIBRATOR OPERATIVELY CONNECTED TO SAID TERMINAL SO AS TO BE TRIGGERED BY SAID INPUT PULSES, MEANS FOR PRODUCING FROM SAID PULSES A REFERENCE WAVEFORM, A CABLE CONNECTING SAID REMOTE CONTROL UNIT WITH A CAMERA UNIT, MEANS OPERABLE FROM SAID MULTIVIBRATOR FOR PRODUCING A TRAIN OF AUXIALLIARY DRIVING PULSES, MEANS FOR FEEDING SAID DRIVING PULSES TO SAID CABLE, MEANS AT SAID CAMERA UNIT FOR CAUSING EACH OF THE SAID DRIVING PULSES TO OPERATE A HORIZONTAL SCAN GEN ERATOR, MEANS FOR DERIVING FROM THE HORIZONTAL SCAN GENERATOR RETURN PULSES, EACH CORRESPONDING WITH ONE OF SAID DRIVING PULSES, WHOSE TIME OF OCCURANCE DEPENDS ON THE DELAY IN THE CABLE, MEANS FOR TRANSMITTING THE RETURN PULSES TO THE CABLE, MEANS AT THE REMOTE CONTROL UNIT FOR DERIVING A REGULATING POTENTIAL BY A PHASE COMPARISON OF THE REFERENCE WAVEFORM AND EACH PULSE OF THE RETURNED PULSE TRAIN, MEANS FOR CAUSING SAID REGULATION POTENTIAL TO CONTROL THE RETURN STROKE OF THE MULTIVIBRATOR AND MEANS FOR DELAYING THE MASTER SYNCHRONISING PULSE IN THE INPUT OF THE MULTIVIBRATOR TO ENSURE THAT THE MONOSTABLE MULTIVIBRATOR HAS RETURNED TO ITS STABLE STATE BEFORE THE OCCURRENCE IN ITS INPUT CIRCUIT OF EACH TRIGGERING PULSE FROM THE MASTER SYNCHRONISING GENERATOR.