Steve and Joe,
Just started running wsprd_exp on my Raspberry Pi. Compilation went clean
and I am decoding spots. Over the weekend I will do some more tests with
some recorded wspr audio files.
The recent improvements on wsprd are simply remarkable. The techniques
employed are novel and would make a excellent topic for a QEX article!
Many thanks and congratulations for the achievements.
73, Edson PY2SDR
---
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On Fri, Jun 26, 2015 at 1:31 PM, Steven Franke <[email protected]>
wrote:
> Hi Joe,
>
> I’m glad to see that you were able to confirm the improved performance of
> the two-pass decoder. I’m guessing that your dataset includes a more
> representative mixture of bands and conditions than the group of 20m files
> that I used. Hence the smaller, but still significant, increase in the
> number of decodes over the default wsprd.
>
> I am surprised by your observation that the two-pass decoder is faster
> than the default one. That’s not what I see here. Are you using your
> wspr_timer.out times? Or some other measure of execution time? The numbers
> that I reported were the “Total” times from wspr_timer.out.
>
> I just ran the analysis of my 20m files using the current default wsprd.
> It was slightly slower than running wsprd_exp with the -s (single-pass
> option):
>
> wsprd: 1315 decodes in 163s
> wsprd_exp -s: 1315 decodes in 159s (taken from Table 1 in the .pdf writeup)
>
> But in my case, both of these single-pass times are much shorter than the
> two-pass execution time, which was 270s. I wonder if there is some compiler
> optimization setting that was different between your wsprd and wsprd_exp
> instances?
>
> Steve k9an
>
>
> > On Jun 26, 2015, at 11:00 AM, Joe Taylor <[email protected]> wrote:
> >
> > Hi all,
> >
> > I have committed a "Makefile.win32" for building wsprd_exp.exe during
> > testing.
> >
> > I have now run compartson tests of wsprd.exe and wsprd_exp.exe using a
> > group of 410 *.wav files, with the following results:
> >
> > ---------------------------------------------------------
> > Decoder Decodes Time
> > (s)
> > ---------------------------------------------------------
> > 1. wsprd 2291 524
> > 2. wsprd_exp 2551 418
> > 3. wsprd_exp 2653 434
> > ---------------------------------------------------------
> >
> > Run #1 used the default wsprd.exe now built along with WSJT-X v1.6.0.
> > Run #2 uses Steve's wsprd_exp with incoherent (symbol-by-symbol) signal
> > subtraction; #3 used his fully coherent subtraction routine.
> >
> > Important note: to make the coherent subtraction work in Windows I had
> > to increase the stack size -- see LDFALGS in Makefile.win32.
> >
> > So, with these example files I got 11% more decodes with
> > symbol-by-symbol subtraction and 16% more decodes with coherent
> > subtraction.
> > The two-pass decoder appears to be faster than the single-pass one. (I
> > don't yet know why, but in a couple of runs this seems to be repeatable.)
> >
> > I think these results are very impressive! We should certainly make
> > wsprd_exp (renamed to wsprd) the default WSPR decoder.
> >
> > -- 73, Joe, K1JT
> >
> >
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>
>
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