Code and complement testing device

Claim 1

AN ELECTRICAL PULSE CHECKING DEVICE FOR TESTING THE OUTPUT OF APPARATUS CAPABLE OF PRODUCING A CODED SIGNAL HAVING N BITS SPACED BETWEEN A PAIR OF FRAMING PULSES, EACH OF WHICH BITS MAY CONSIST OF EITHER A PULSE OR THE ABSENCE OF A PULSE WHEREBY THE OUTPUT SIGNAL MAY BE CODED IN A PRESELECTED MANNER, SAID CHECKING DEVICE COMPRISING: FIRST DECODING MEANS FOR RECEIVING A FIRST CODED SIGNAL HAVING N BITS SPACED BETWEEN A PAIR OF FRAMING PULSES, SAID FIRST DECODING MEANS INCLUDING FIRST GATE MEANS; SECOND DECODING MEANS FOR RECEIVING A SECOND CODED SIGNAL HAVING N BITS, EACH OF WHICH IS COMPLEMENTARY TO THE CORRESPONDING BIT OF SAID FIRST CODED SIGNAL AND SPACED BETWEEN A PAIR OF FRAMING PULSES CORRESPONDING TO THE FRAMING PULSES OF SAID FIRST CODED SIGNAL, SAID SECOND DECODING MEANS INCLUDING SECOND GATE MEANS; FIRST AND SECOND PULSE GENERATING MEANS EACH OF WHICH IS CONNECTED TO SAID FIRST AND SECOND GATE MEANS, SAID PULSE GENERATING MEANS RECEIVING SAID CODED SIGNALS AND PRECLUDING AN OUTPUT PULSE FROM SAID GATE MEANS UNLESS THE FRAMING PULSES OF SAID RECEIVED CODED SIGNALS ARE SPACED A PREDETERMINED DISTANCE; SELECTOR MEANS CONNECTED TO SAID DECODING MEANS FOR CAUSING AN OUTPUT PULSE TO BE PRODUCED FROM SAID FIRST DECODING MEANS ONLY WHEN THE BITS OF SAID RECEIVED FIRST CODED SIGNAL CORRESPOND TO A PRESELECTED CODE, AND FOR CAUSING AN OUTPUT PULSE TO BE PRODUCED FROM SAID S ECOND DECODING MEANS ONLY WHEN THE BITS OF SAID RECEIVED SECOND CODED SIGNAL CORRESPOND TO THE COMPLEMENT OF SAID PRESELECTED CODE; AND INDICATING MEANS CONNECTED TO RECEIVE SINGULARLY SAID OUTPUTS FROM SAID DECODING MEANS TO INDICATE THAT THE APPARATUS TESTED IS FUNCTIONING PROPERLY.