luaradio VS airspy-fmradion

Hi all, I'm currently working on some control systems and need a high/low-pass filter in lua. I've found a radiofilter library on github but I dont want to use the whole thing, and am not able to reverse engineer the high/low-pass filter part (tried and failed :/ ) and am also not able to derive it from the wikipedia page.

You can do this using Luaradio. From the example here : https://github.com/vsergeev/luaradio/blob/master/examples/rtlsdr_rds.lua and here : https://luaradio.io/examples/rtlsdr-rds.html replace the line local source = radio.RtlSdrSource(frequency + tune_offset, 1102500) by by an (IQFileSource)[https://luaradio.io/docs/reference-manual.html#iqfilesource] : local source = radio.IQFileSource('/tmp/myfile.cf32, 'f32le', 1102500) Take care to the samplerate, or adapt the script to your samplerate. Tip: use luaradio -v to check samplerate coherence along the chain.

Instead maybe have a look to this jewel : https://luaradio.io/ Easy to install (a couple of dependencies and a simple copy from git). Using scripting instead of GUI, and based and blocks. Latest version includes built-in applications for demodulation and decoding. Well documented with valuable examples, easy to understand. Linux only, all platforms. I'm a big fan.

Good news. Following informations on this link (https://github.com/vsergeev/luaradio/issues/64) , I was able to write a little GUI using luaradio embedded in love2d script, change/display frequency using keyboard shortcuts. That was just a quick test, really interesting ;) Have to find the files on my backup.

I have a little hobby project where I record an FM radio music station using a SDR and then remove all the non-music portions for offline listening. I like the music selections the DJs pick, but I prefer not to listen to the DJ commentary and the advertisements.

I evaluated three methods of recording: analog capture from a standalone FM receiver, using this nrsc5 library to record the "HD" radio stream, and using an AirSpy SDR with this library: https://github.com/jj1bdx/airspy-fmradion

Recording the "HD" (what a misnomer) radio was nice in that there was no hiss or multipath effects, but in comparison to the other methods the digital compression artifacts became impossible to un-hear. It seems to top out at about 96 kbps

The airspy-fmradion library has some nice stuff in it to address multipath, resulting in the best audio quality of the three methods I tested.

I use https://github.com/ina-foss/inaSpeechSegmenter to identify which segments of the recordings are speech vs. music.

Alternatively, use airspy-fmradion:

You might want to look into using https://github.com/jj1bdx/airspy-fmradion instead of rtl_fm for stereo.

You can use https://github.com/windytan/wfm-tools together with rtl_fm to get stereo, though I prefer https://github.com/jj1bdx/airspy-fmradion