Signaling circuitry for time-sharing telecommunication system

Abstract

Abstract COMMUNICATION-ESPECIALLY TELEPHONE-SYSTEM WITH A PLURALITY OF LOCAL LINES SEQUENTIALLY CONNECTABLE TO A COMMON TERMINAL FOR A BRIEF SAMPLING INTERVAL DURING WHICH INCOMING MESSAGE SAMPLES ARE STORED ON A CONDENSER WHICH IMMEDIATELY THEREAFTER DISCHARGES THROUGH A FILTER INTO THE CORRESPONDING LOCAL LINE. TO SIGNAL A SUBSCRIBER ON THE LINE, A CONTINUOUS AUDIOFREQUENCY WAVE GENERATED AT THE TERMINAL IS CHOPPED INTO A TRAIN OF BRIEF PULSES STORED ON A COMMON CAPACITOR BETWEEN SUCCESSIVE SAMPLING INTERVALS, THIS CAPACITOR CHARGING THE LINE CONDENSER OF AN INDIVIDUAL SUBSCRIBER ONLY IF, DURING THE CORRESPONDING SAMPLING INTERVAL, AN ENABLING PULSE COINCIDES WITH A MODULATING PULSE MEASURING A CHARACTERISTIC SIGNALING PERIOD.

Inventors

• 👤 Ferdinando Formenti
• 👤 Giuseppe Valbonesi

Bibliographic Details