Ooops! A break statement went missing when I merged my two patches (rtl_fm-cal and print_deviation). Attatched to this mail is a new combined patch, sm0svx- combined-v2.patch.gz.
Regards, Tobias Thursday, August 07, 2014 Tobias wrote: > Hi, > > I've implemented a FM deviation measurement mode in rtl_fm. It's turned > on using the -D command line switch. > > [-D [tone freq]] Print the deviation of an FM signal. > If given without a tone frequency, the whole bandwidth > is used in the measurement. This include a lot of noise on > weak signals so the measurement will not be so good. > If a deviation measurement is done on a single tone the > tone frequency should be given to improve the accuracy > of the estimate. > > If measuring on the whole bandwidth a simple min/max measurement is done > on the demodulated signal and the deviation is determined from the > difference. This work ok for very strong signals but just a little bit > of noise will mess up the estimate. This mode can be used to get an > approximate estimate for a voice signal for example. > > If a tone frequency is given then the Goertzel single bin DFT algorithm > is used to find out the amplitude of the tone. This is much better since > all noise outside of the binwidth (100Hz) will be removed. > > The patch is attached to this mail (sm0svx-print_deviation.patch.gz). I > have also attached a patch that is a combination of my previous patch > and the print_deviation patch (sm0svx-combined.patch.gz). I did this > since the two patches conflict with each other in quite a few places. > Hopefully this will make it easier for the maintainer to merge. > > The code is also available on GitHub but I didn't create a pull request > since that does not seem to be the way you want to work with patches. > Tell me if you want me to create a pull request after all. > > https://github.com/sm0svx/librtlsdr/tree/print_deviation > https://github.com/sm0svx/librtlsdr/tree/sm0svx > > Regards, > Tobias
sm0svx-combined-v2.patch.gz
Description: GNU Zip compressed data
