On 12/03/12 10:08 PM, Andrew Davis wrote: > Doesn't sound as good to me, maybe it's just a bad sample. I for some > reason ( I know the math tells me otherwise ) I find it sounds better > the faster I sample, like 500M. I feel like it has something to do > with more exact following of the FM signal curve or something. > > I had the bass turned up, which matches my speakers well, but now that I'm listening to the "Baba O'Reilly" sample on my headphones, it's quite a bit too bassy.
> So how exactly does the software FM Demod work ( crossing detection )? > And why can my $5 toy FM radio sound so much cleaner? > > It's a quadrature demodulator using ATAN2--not a simple crossing detector. It should be quite high fidelity. Some of these "listening tests" are notoriously subjective as well, and the source material varies wildly in quality. The other thing is this receiver doesn't do any deemphasis processing, choosing instead to have a 3-band equalizer with settable gains that allow you to tweak the audio spectrum of the output a bit. Some keener could make it more fine-grained to tune the resulting sound to suit personal preferences/room/etc. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
