Method and apparatus for dynamic automatic gain controlling in the event of loss of pilot signal.

摘要

AUTOMATIC GAIN CONTROL CIRCUIT OF CONVENTIONAL TECHNIQUES invention improves USING A CARRIER COMMAND FOR CONTROLLING by monitoring (13) THE PRESENCE OF CARRIER COMMAND. IF THE CARRIER LEVEL CONTROL IS undetectable, will switch CONTROL LEVEL control section (2) OF AUTOMATIC GAIN CONTROL CIRCUIT ADJUSTMENT FOR THERMAL EQUIVALENT via a switch (24). Switch (24) connects the network output temperature sensing (14) with a drive circuit BODE (23) approximating the attenuation of a transmission medium GIVEN THROUGH THE TEMPERATURE. Gain adjustment THEREFORE BE BASED ON AN APPROXIMATION OF THE CABLE LOSSES THAT SHOULD OCCUR TO DETECT THE TEMPERATURE amplifier housing. The invention provides a gain setting DYNAMIC, EVEN IF SIGNAL LOSS OF CARRIER COMMAND.