Double threshold gain regulator for communication systems

Claim 1

IN A COMMUNICATIONS SYSTEM, AN ARRANGEMENT FOR REGULATING THE GAIN OF A TRANSMISSION PATH TO COMPENSATE FOR LEVEL VARIATIONS OF AN INCOMING SIGNAL RECEIVED AT THE INPUT OF SAID TRANSMISSION PATH, SAID INCOMING SIGNAL INCLUDING AN INBAND CONTROL SIGNAL, SAID ARRANGEMENT COMPRISING; (A) A VARIOLOSSER IN SAID TRANSMISSION PATH HAVING AN INCOMING SIGNAL INPUT, A REGULATION SIGNAL INPUT, AND AN OUTPUT; (B) RECTIFIER MEANS COUPLED TO SAID VARIOLOSSER OUTPUT; (C) MEANS TUNED TO SAID CONTROL SIGNAL INTERPOSED BETWEEN SAID RECTIFIER MEANS AND SAID VARIOLOSSER OUTPUT; (D) MEANS INTERPOSED BETWEEN SAID RECTIFIER MEANS AND SAID VARIOLOSSER REGULATION SIGNAL INPUT FOR DERIVING SAID REGULATION SIGNAL, MEMORY MEANS INCLUDED IN SAID REGULATION SIGNAL DERIVATION MEANS FOR PROVIDING UPON THE LOSS OF SAID CONTROL SIGNAL, SUBSTANTIALLY THE SAME REGULATION SIGNAL AS IT PROVIDED IMMEDIATELY PRIOR TO SAID LOSS; (E) MEANS GOVERNING THE CONNECTION BETWEEN SAID RECTIFIER MEANS AND SAID MEMORY MEANS; AND (F) REGULATION CONTROL MEANS CONNECTED TO SAID TRANSMISSION PATH INPUT AND TO SAID GOVERNING MEANS, AND TUNED TO SAID INBAND CONTROL SIGNAL FOR DERIVING A LEVEL RANGE SIGNAL FOR CONTROLLING SAID GOVERNING MEANS SAID REGULATION CONTROL SO THAT SAID RECTIFIER MEANS IS CONNECTED TO SAID MEMORY MEANS ONLY WHEN THE LEVEL OF SAID INBAND CONTROL SIGNAL IS WITHIN A PREDETERMINED RANGE.