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Nikos Balkanas nikos.balkanas at eyeonix.comOn Thu, Jan 30, 2014 at 5:35 PM, keenerd <keenerd at gmail.com> wrote: > On 1/30/14, keenerd <keenerd at gmail.com> wrote: > > On 1/30/14, Anders Lynge Esbensen <anders at lyes.dk> wrote: > >> I've implemented a faster FM demodulator for rlt_fm. > > > > Let me see if I can get a fixed-point version written. > > I've cleaned it up and it is in my repo. You can enable it with "-A ale" > https://github.com/keenerd/rtl-sdr/commit/025fb56dff98 > > Some quick benchmarks: > std: 10% > fast: 7% > lut: 7% > ale: 7% > > Sound quality is also noticably worse with ale, but that might be from > an error in the fixed point conversion. How does the math look to > you? > I have also be playing around with the atan demodulators. gnuradio uses fast-atan tables instead of the libC version. I dunno how libc implements it, but they could be worth considering... Nikos > > -Kyle > http://kmkeen.com > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20140130/9856d670/attachment.htm>