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Nick Foster bistromath at gmail.comFor transmitters that don't use tone squelch, the best FM squelch is a noise squelch, which detects the "quieting" an FM signal causes. The gr-scanner project (which is incomplete/work-in-progress, don't bug me about functionality yet) has one, albeit written for Gnuradio: https://github.com/bistromath/gr-scanner/blob/master/python/standard_squelch_ff.py It's a rewrite of Gnuradio's "standard squelch". --n On Mon, Dec 9, 2013 at 10:17 AM, James Sharp <james at fivecats.org> wrote: > On 12/9/2013 7:33 AM, Chris Hanson wrote: > >> Thanks for the response. I looked at the code and from what I can tell, >> it’s just using various ham radio rigs built in CTCSS facilities and >> programming them via RS232. Am I missing something? >> > > The app_rpt file has some functions to detect tones in an audio stream > that can be used to detect the CTCSS tones. Look through the "tone_detect" > function along with the goertzel_* functions. > > They're not specifically tagged as functions to decode CTCSS tones, but > they should be able to be used as such. > > Those functions are expecting to be fed a 16-bit signed linear mono audio > stream. > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20131209/6bb29c97/attachment.htm>