robotastic

7 ms·

31.
by robotastic 6y ago
It might be worth checking out https://www.assemblyai.com they let you build a custom audio model. One challenge with the audio from these radios is that it goes through some heavy compression. Traditional models will have a lot
32.
by robotastic 6y ago
Feel free to add something like this to some of the feeds from http://openmhz.com I can give you some pointers on how to pull down the streams of audio. They are already chopped into M4A files.
33.
Show HN: Using ML and a Pen Plotter to create one of a kind postcards(robo.cards)
1 points by robotastic 7y ago|0 comments
34.
by robotastic 9y ago
It would depend on what type of modulation they are using. If it is narrow band FM, it should work fine. There are probably lighter weight solutions though. If you wanted to use a RTL dongle, you would also need an upconverter, since the do
35.
by robotastic 9y ago
It would probably work pretty good for that. If you were just trying to listen to one talkgroup at a time, the raspberry pi should have enough CPU. Let me know how it goes! I happy to help patch things up to get this working.
36.
by robotastic 9y ago
Anything with a TXCO is pretty good. I like these: http://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/ And these: https://www.amazon.com/NooElec-NESDR-SMArt-Enclosure-R820T2-...
37.
by robotastic 9y ago
There is also this Rust based P25 decoder that I have been wanting to give a try: https://github.com/kchmck/p25rx It is a ground up re-write that doesn't need Gnuradio, so it could be pretty efficient.
38.
by robotastic 9y ago
Unfortunately, I wasn't able to find a nice generic way to make it easy to configure the PFBs. There is a good thread on it here, with some sample code: https://github.com/robotastic/trunk-recorder/issues&#x2F
39.
by robotastic 9y ago
Thanks! So I have been playing with it on a RPi3. There are instructions here on how to build for the RPi: https://blog.hypriot.com/post/building-a-64bit-docker-os-for... It has about enough CPU to handle recording abo
40.
by robotastic 9y ago
If you are interested in trying to listen your local radio system, try out Trunk Recorder: https://github.com/robotastic/trunk-recorder It works with the cheap $20 RTL-SDR dongles.
41.
Show HN: Record and share police/fire radio systems(openmhz.com)
102 points by robotastic 9y ago|46 comments