Subscriber circuits for telecommunication systems
阅读：280发布：2024-02-13
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1. A SUBSCRIBER CIRCUIT FOR TELECOMMUNICATIONS SYSTEMS UTILIZING TO THE FULL THE LOOP CURRENT FLOWING IN A CLOSED LOOP, WITH TWO BRANCHES CONNECTED PARALLEL TO ONE ANOTHER BETWEEN THE TWO CONDUCTORS OF THE SUBSCRIBER LOOP, THE FIRST BRANCH INCLUDING THE PRIMARY WINDING OF THE LINE TRANSFORMER IN SERIES WITH A CAPACITOR AND THE SECOND BRANCH WHEREOF CONTAINS THE CENTRAL BATTERY IN SERIES WITH A RESISTANCE AND AN INPUT WINDING OF A RING CORE WHICH IS MAGNETICALLY SATURATED BY THE EFFECT OF THE LOOP CURRENT AND CARRIES FURTHER WINDINGS WHICH SERVE TO ASCERTAIN THE MAGNETIC SATURATION OF THE RING CORE FOR THE PURPOSE OF UTILISING TO THE FULL THE CURRENT FLOWING IN THE CLOSED LOOP AND THE SECOND BRANCH INCLUDING TWO SELFINDUCTION COILS EACH CONNECTED TO A CONDUCTOR OF THE SUBSCRIBER LINE, THE ENDS OF THE COILS REMOTE FROM THE CONDUCTORS BEING CONNECTED BY A SECOND CAPACITOR, THE SO-FORMED FREQUENCY SENSITIVE CIRCUIT HAVING A HIGH-PASS FILTER FORMED BY THE PRIMARY INDUCTANCE OF THE LINE TRANSFORMER AND THE FIRST-MENTIONED CAPACITOR AND A LOW-PASS FILTER FORMED BY THE SELF-INDUCTION COILS AND THE SECOND CAPACITOR AND BEING COMPLETED BY A RESISTANCE, THE ELEMENT OF SAID CIRCUIT BEING SO DIMENSIONED THAT THE ATTENUATION BETWEEN THE SUBSCRIBER LINE AND THE LINE TRANSFORMER IS CONSTANT IN THE FREQUENCY BAND OF THE INFORMATION TO BE TRANSMITTED FROM SUBSCRIBER TO SUBSCRIBER AND INCREASESD WITH DECREASING FREQUENCY AT LOWER FREQUENCIES, THE ATTENUATION BETWEEN THE SUBSCRIBER LINE AND THE INPUT WINDING IS CONSTANT FROM ZERO FREQUENCY TO A FREQUENCY LYING BELOW THE SAID FREQUENCY BAND AND INCREASES ABOVE THIS FREQUENCY WITH INCREASING FREQUENCY, AND THE INPUT IMPEDANCE OF THE FREQUENCY-SENSITIVE CIRCUIT MEASURED BETWEEN THE CONDUCTORS REMAINS CONSTANT FROM ZERO FREQUENCY TO THE UPPER LIMIT OF THE AFORESAID FREQUENCY BAND.
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