Demodulating FM signals esp. in ultra short wave range - sampling received signal and passing sampled signal through band filter with complex value coeffts.

摘要

In the demodulation method the frequency modulated signal is filtered by a low pass filter. The desired phase increment and the transmitted signal are obtained by subsequent complex multiplication. The sample received undergoes filtering by a band filter having complex value coeffts. The real part of the transmitted signal obtained by the complex multiplication is subject to an arc cosine conversion. The resulting signal is passed through a high pass filter to eliminate the equal portion overlapping the signal. USE/ADVANTAGE - Generates demodulation signal of equal or higher quality at reduced expense.