Importance

Loading Importance Indicators...

Abstract

A system comprising a demodulator for demodulating an input FM signal which has been subjected to interference by another FM signal, an envelope detector for detecting the envelope of fluctuation of the amplitude of the input signal, an AGC circuit for controlling the level of the input signal supplied to the envelope detector, a capacitor for passing only the AC component of the output of the envelope detector, a first delay circuit for delaying the AC component by a specific delay time, a circuit having a transfer characteristic of a hyperbolic function and converting the waveform of the output of the first delay circuit, an analog multiplier supplied at its x input terminal with the output of the waveform converting circuit and producing a distortion cancellation signal, a second delay circuit for delaying the output demodulated signal of the demodulator by the specific delay time, a first operation circuit supplied with the output signal of the second delay circuit and with the distortion cancellation signal and carrying out an operation such as substantially cancelling the interference distortion of the demodulated signal with the distortion cancellation signal, and a second operation circuit supplied with the output signal of the first operation circuit and the output signal of the demodulator, thereby carrying out a signal combining operation and supplying the resulting output signal to the y input terminal of the analog multiplier. The output of the first operation circuit is a demodulated signal in which the interference distortion has been cancelled and thus removed.

Loading the Abstract Image...

First Claim