Digital FM Demodulator with Reduced Computational Complexity

This paper describes a simple implementation of FM demodulator with reduced computational complexity. Key idea is to avoid sinus, cosine, arctan functions to increase performance at the expense of slightly reduced quality of demodulated signal. This allows implement the demodulator using simple microcontrollers without special digital signal processing features. Additional benefit is the possibility to demodulate FM signals in a relatively wide range, without changing of sampling and local oscillator frequencies.