Intermodulation distortion correction of angle modulated transmission system by use of nonlinear cancellation circuit
阅读：565发布：2021-07-04
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1. AN EQUALIZER FOR ELIMINATING INTERMODULATION DISTORTION PRODUCTS ENCOUNTERED IN THE DEMODULATED SIGNAL OF A TRANSMITTED ANGLE MODULATED SIGNAL COMPRISING, IN COMBINATION, A SOURCE OF AN ANGLE MODULATED SIGNAL, MEANS TO TRANSMIT SAID SIGNAL, MEANS HAVING AN OUTPUT TERMINAL TO DEMODULATE SAID TRANSMITTED SIGNAL, MEANS CONNECTED TO SAID OUTPUT TERMINAL OF SAID DEMODULATION MEANS TO GENERATE A SIGNAL PROPORTIONAL TO THE SQUARE OF SAID DEMODULATED SIGNAL, MEANS CONNECTED TO SAID OUTPUT TERMINAL OF SAID DEMODULATION MEANS TO GENERATE A SIGNAL PROPORTIONAL TO THE CUBE OF SAID DEMODULATED SIGNAL, MEANS TO MULTIPLY SAID SIGNAL PROPORTIONAL TO THE SQUARE OF SAID DEMODULATED SIGNAL BY A PREDETERMINED CONSTANT, MEANS TO MULTIPLY SAID SIGNAL PROPORTIONAL TO THE CUBE OF SAID DEMODULATED SIGNAL BY A PREDETERMINED CONSTANT, DIFFERENTIATION MEANS TO DIFFERENTIATE SAID SIGNAL PROPORTIONAL TO THE SQUARE OF SAID DEMODIATE SAID SIGNAL, MEANS TO MULTIPLY SAID DIFFERENTIATED SIGNAL BY A PREDETERMINED CONSTANT, MEANS TO ADD SAID MULTIPLIED SIGNALS, AND SUBTRACTION MEANS HAVING TWO INPUT TERMINALS A FIRST OF WHICH IS CONNECTED TO SAID OUTPUT TERMINAL OF SAID DEMODULATION MEANS AND A SECOND TERMINAL FOR RECEIVING SIGNALS PROPORTIONAL TO SAID SUMMED SIGNALS TO SUBTRACT SAID SIGNALS PROPORTIONAL TO SAID SUMMED SIGNALS FROM SAID DEMODULATED SIGNAL.
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