Variable timing automatic interrupter circuit for common telephone sender equipment

Abstract

Abstract IN A TELEPHONE SYSTEM EMPLOYING COMMON SNEDER EQUIPMENT AN AUTOMATIC INTERRUPTER CIRCUIT FOR CONNECTION TO A COMMON SENDER FOR DISCONNECTING SAID COMMON SENDER FROM A PARTICULAR SUBSCRIBER LINE AFTER A PREDETERMINED PERIOD OF INACTIVITY UPON SAID PARTICULAR SUBSCRIBER LINE, THE AUTOMATIC INTERRUPTER CIRCUIT COMPRISES A TIMING PULSE GENERATOR ADAPTED TO FEED PULSES HAVING A PREDETERMINED WIDTH AND SELECTIVELY VARIABLE REPETITION RATE TO SAID COMMON SENDER TO CAUSE DISCONNECTION OF THE SAME FROM SAID PARTICULAR SUBSCRIBER LINE AFTER THE RECEPTION OF TWO SUCCESSIVE PULSES. THE TIMING PULSE GENERATOR COMPRISES A PULSE SHAPING NETWORK CONNECTED TO A FREQUENCY DIVIDER, IN TURN CONNECTED TO A BINARY COUNTER, THE OUTPUT OF SAND BINARY COUNTER BEING APPLIED AS A FIRST INPUT TO A TIME COINCIDENCE GATE DECODER AND THE SECOND INPUT THERETO BEING OBTAINED FROM A TIME SELECTOR SWITCH. THE OUTPUT OF SAID BINARY COUNTER IS ALSO CONNECTED AS AN INPUT TO A DRIVE SIGNAL DECODER AND WHEN A COINCIDENCE IS DETECTED BY SAID TIME COINCIDENCE GATE DECODER A RESET PULSE IS FED THEREFROM TO SAID BINARY COUNTER WHICH RESULTS IN A PULSE HAVING A FIXED DURATION AT THE OUTPUT OF SAID DRIVE SIGNAL DECORDER, WHICH FIXED DURATION PULSE IS INDICATIVE OF THE SELECTED REPETITION RATE OF THE TIMING PULSE GENERATOR. D R A W I N G

Inventors

• 👤 G Manos

Bibliographic Details