Telephone signalling system including a pulse-correcting system for maintaining constant make-to-break time ratio with varying dial pulse speeds

Claim 1

IN A TELEPHONE SIGNALLING SYSTEM FOR ESTABLISHING A CONNECTION BETWEEN A CALLING AND A CALLED STATION IN RESPONSE TO PULSED DIAL TONE SIGNALS REPRESENTING THE DIALING DIGITS, AN APPARATUS FOR SELECTIVELY ESTABLISHING A LINE CONNECTION IN RESPONSE TO THE PULSED DIAL TONES AND FOR MAINTAINING THE LINE "MAKE" TO "BREAK" TIME RATIO SUBSTANTIALLY CONSTANT AS THE DIAL TONE PULSE RATE VARIES, INCLUDING (A) MEANS RESPONSIVE TO THE DIAL TONE SIGNALS FOR PRODUCING AT LEAST ONE TRIGGER PULSE IN RESPONSE TO EACH DIAL TONE REPRESENTING A DIALING DIGIT, THEREBY PRODUCING A TRAIN OF TRIGGER PULSES IN RESPONSE TO A DIALING DIGIT TONE PULSE SEQUENCE; (B) VARIABLE PULSE GENERATING MEANS RESPONSIVE TO SAID TRIGGER PULSES FOR PRODUCING AN ENERGIZING PULSE OF VARIABLE WIDTH INCLUDING CIRCUIT MEANS RESPONSIVE TO THE INTERVAL BETWEEN TRIGGER PULSES FOR VARYING THE PULSE WIDTH DIRECTLY AS A FUNCTION OF SAID INTERVAL BETWEEN TRIGGER PULSES WHEREBY SAID PULSE WIDTH VARIES INVERSELY WITH THE DIAL-TONE PULSE RATE;