Color-television test signal generator

Claim 1

APPARATUS FOR USE IN TESTING THE PERFORMANCE OF COLOR-TELEVISION RECEIVERS COMPRISING: FIRST MEANS FOR SUPPLYING FIRST SIGNALS INCLUDING HORIZONTAL SYNCHRONIZING PULSES AND COLOR BURSTS FOR SYNCHRONIZING THE COLOR OSCILLATOR OF A RECEIVER TO BE TESTED AT THE PROPER COLOR SUBCARRIER FREQUENCY; SECOND MEANS FOR SUPPLYING A CONTINUOUS WAVE SIGNAL OF FREQUENCY DIFFEREING FROM THE COLOR SUBCARRIER FREQUENCY BY AN ODD MULTIPLE OF ONE-HALF OF THE HORIZONTAL SYNCHRONIZING PULSE REPETITION RATE; AND THIRD MEANS FOR COMBINING SAID FIRST SIGNALS AND SAID CONTINUOUS WAVE SIGNAL AND FORMING A COMPOSITE SIGNAL SUITABLE FOR COUPLING INTO THE RECEIVER TO BE TESTED, SAID COMPOSITE SIGNAL HAVING SAID CONTINUOUS WAVE SIGNAL INCORPORATED AS SIMULATED CHROMINANCE INFORMATION DURING PERIODS BETWEEN PREDETERMINED HORIZONTAL SYNCHRONIZING PULSES; WHEREBY THE COMPOSITE SIGNAL WILL CAUSE A BEAT-NOTE SIGNAL TO BE DEVELOPED IN EACH COLOR INFORMATION CHANNEL OF A RECEIVER UNDER TEST AND PERFORMANCE INFORMATION CAN BE DERIVED FROM SUCH BEAT-NOTE SIGNALS.