Arrangement for minimizing effects of noise by automatic frequency deviation controlin fm communication systems

Claim 1

IN A FREQUENCY MODULATION RADIO COMMUNICATION SYSTEM HAVING LOCAL TRANSMITTER INCLUDING AN INTELLIGENCE SIGNAL MODULATOR AND A RECEIVER ADJUNCT, AND A REMOTE RECEIVER INCLUDING MEANS FOR RECOVERING THE INTELLIGENCE SIGNAL AND A TRANSMITTER ADJUNCT, THE IMPROVEMENT THEREIN FOR AUTOMATICALLY MINIMIZING THE EFFECT OF NOISE UPON A CHANGE IN CONDITIONS INFLUENCING NOISE COMPRISING: MEANS AT THE LOCAL TRANSMITTER FOR GENERATING A TEST SIGNAL SIGNIFICANTLY DISTINCT FROM THE INTELLIGENCE SIGNAL FREQUENCIES; MEANS FOR APPLYING SAID TEST SIGNAL TO THE LOCAL TRANSMITTER MODULATOR; MEANS CONNECTED TO THE REMOTE RECEIVE FOR DERIVING A NOISE ERROR SIGNAL FROM A SELECTED FUNCTION OF THE TEST SIGNAL; MEANS AT THE REMOTE RECEIVE INCLUDING SAID TRANSMITTER ADJUNCT FOR TRANSMITTING SAID NOISE ERROR SIGNAL;