Digital Computation of FM Distortion due to Bandpass Filters

A numerical method which uses a first-order approximation for calculating FM distortion due to bandpass filters has been developed. The transfer function of the bandpass filter is represented by a Fourier series. The numerical accuracy of this method can be determined by checking the sampled impulse response of the network and the sampled autocorrelation function of the phase distortion. Applications of this method are illustrated by examples.