Wideband FM receiver¶
In this example, we present a monophonic FM broadcasting receiver developed with GNURadio. This fairly simple flowgraph illustrates filtering and rate conversions. Approximately 1/5 of the FM band is observed in the frequency domain thanks to the first frequency sink (several channels in use should be seen). The signal is then low-pass filtered and decimated in order to demodulate a single channel around the chosen center frequency. Frequency demodulation is performed thanks to a frequency discriminator (the block also includes a low-pass and deemphasis filters). After a volume control, the signal is then resampled according to the soundcard requirements.