new FM demodulator

Sdr Guru sdrguru1 at
Thu Jan 30 14:45:54 UTC 2014


Perhaps you can add a simple performance test to rtl_fm.
"decoding 100000 samples takes xxx ms" or something like that.
It helps to compare different CPU and OS families.

On Thu, Jan 30, 2014 at 4:19 PM, keenerd <keenerd at> wrote:

> On 1/30/14, Anders Lynge Esbensen <anders at> wrote:
> > Hi and thanks for a great tool set.
> >
> > I've implemented a faster FM demodulator for rlt_fm. Its an
> > instantaneous frequency demodulator, like the already implemented atan
> > method, but it uses some math tricks to get rid of the the actual atan
> > calculation. Feel free to use it if you wish
> Nice, thank you.
> It should probably be under the -A option with all the other types of
> FM demodulator math.  Maybe benchmark it against the other FM
> demodulators, "-A fast" or "-A lut".  The default "-A std" was not
> designed to be very quick, just accurate.  Being faster than "-A std"
> is not very difficult.
> Let me see if I can get a fixed-point version written.
> -Kyle
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