INTERFERENCE WAVE ELIMINATION DEVICE

PURPOSE:To extract a signal in existence while being buried in an interference wave by giving a reception signal to each of nonlinear processing section and linear processing section, extracting a difference of outputs of the two processing sections and adjusting the gain so as to eliminate the interference wave. CONSTITUTION:An input signal X(t) is given to a nonlinear circuit 2 and a linear circuit 1. An output Y(t) of the circuit 2 is extracted as a fundamental component only in the vicinity of the angular frequency by a band pass filter 3. An output YF(t) of the filter 3 is modulated by amplitude waveform information of the interference wave by a modulation circuit 4. An output YM(t) of the modulator 4 is a product between the YF(t) and the amplitude of the interference wave. A gain controller 6 controls the gain of the amplitude waveform of the interference wave with respect to the quantity of the interference wave. A difference output Z(t) is obtained between the output YM(t) and the output of the circuit 2 at the difference circuit. Through the constitution above, the signal in existence while being buried in the interference wave is extracted by having only to control the amplitude of the interference wave.