Automatic gain control system utilizing a network containing a short time constant and a long time constant

Claim 1

A SIGNAL TRANSLATING SYSTEM HAVING A GAIN LEVEL THEREIN DEPENDENT UPON THE LEVEL AND DURATION OF A TRANSLATED SIGNAL, INCLUDING IN COMBINATION, A GAIN ESTABLISHING CIRCUIT CONNECTED TO SAID SIGNAL TRANSLATING SYSTEM FOR ESTABLISHING THE GAIN THEREOF IN RESPONSE TO A DIRECT CURRENT CONTROL POTENTIAL, A DETECTOR CIRCUIT INCLUDING A SHORT TIME CONSTANT INTEGRATING NETWORK RAPIDLY RESPONSIVE TO A CHANGE IN LEVEL OF A TRANSLATED SIGNAL IN SAID SYSTEM, SAID DETECTOR CIRCUIT BEING CONNECTED TO SAID GAIN ESTABLISHING CIRCUIT TO PROVIDE A CONTROL POTENTIAL FOR ESTABLISHING THE GAIN LEVEL UPON INITIAL INCREASE IN THE SIGNAL LEVEL, A LONG TIME CONSTANT INTEGRATING NETWORK CONNECTED TO SAID DETECTOR CIRCUIT AND SAID GAIN ESTABLISHING CIRCUIT TO PROVIDE A CONTROL POTENTIAL FOR MAINTAINING THE GAIN LEVEL ESTABLISHED BY SAID DETECTOR CIRCUIT, A FIRST TRANSISTOR CONTROLLED BY SAID DETECTOR CIRCUIT, A RESISTOR-CAPACITOR TIMING NETWORK CONTROLLED BY SAID FIRST TRANSISTOR, A SECOND TRANSISTOR CONNECTED IN CIRCUIT WITH SAID LONG TIME CONSTANT INTEGRATING CIRCUIT AND CONTROLLED BY SAID RESISTOR-CAPACITOR TIMING NETWORK TO PROVIDE A CHARGE CHANGING PATH FOR SAID LONG TIME CONSTANT INTEGRATING NETWORK UPON THE ABSENCE OF A SIGNAL IN SAID DETECTOR CIRCUIT AND AFTER A PREDETERMINED TIME ESTABLISHED BY SAID RESISTOR-CAPACITOR TIMING NETWORK.