"FM broadcasting is a method of radio broadcasting using frequency modulation (FM) technology. Invented in 1933 by American engineer Edwin Armstrong, it is used worldwide to provide high-fidelity sound over broadcast radio." — FM Broadcasting
"In communications, a system is wideband when the message bandwidth significantly exceeds the coherence bandwidth of the channel. Some communication links have such a high data rate that they are forced to use a wide bandwidth; other links may have relatively low data rates, but deliberately use a wider bandwidth than "necessary" for that data rate in order to gain other advantages" — FM Wideband
Gqrx is an open source software defined radio receiver (SDR) powered by the GNU Radio and the Qt graphical toolkit.
Gqrx is free software, licensed under the GNU General Public license allowing anyone to fix and modify it for their use. Gqrx offers features like:
- Discover devices attached to the computer.
- Process I/Q data from the supported devices.
- Change frequency, gain and apply various corrections (frequency, I/Q balance).
- AM, SSB, CW, FM-N and FM-W (mono and stereo) demodulators.
- Special FM mode for NOAA APT.
- Variable band pass filter.
- AGC, squelch and noise blankers.
- FFT plot and waterfall.
- Record and playback audio to / from WAV file.
- Record and playback raw baseband data.
- Spectrum analyzer mode where all signal processing is disabled.
- Basic remote control through TCP connection.
- Streaming audio output over UDP.