> On Oct 11, 2015, at 4:11 PM, Steven Franke <s.j.fra...@icloud.com> wrote:
> 
> Hi Joe and all, 
> 
> This message summarizes my recent work on jt65 decoding in 1.6.1.
> 
> I’ve added 3 new entries to the table summarizing JT-65a decoding results on 
> my batch of 333 20m .wav files. 
> 
> Program                   Good     Bad   Soft    Decoder
> --------------------------------------------------------------------------------------------------------
> 1. WSJT-X r5922        3125      0     574    BM+kvasd (18.4% kvasd)
> 2. WSJT-X r5922        3123      2     572    BM+sfrsd (18.4% sfrsd, 
> ntrials=10000)
> 3. WSJT-X r5922        2551      0     0         BM only
> 4. WSJT-X r5955        2704      0     482    BM+sfrsd2 (17.8% sfrsd, 
> ntrials=5000)
> 5. WSJT-X r5955        2222      0               BM only
> 6. WSJT-X r5970'       2352             0        BM only (ntrials set equal 
> to 0, thresh0=2.5)
> 7. WSJT-X r5970        2930      ?     579    BM+sfrsd2 (19.7% sfrsd, 
> thresh0=2.5, ntrials=2000)        
> 8. WSJT-X r5970’       3013      ?     ?        BM+sfrsd2 (thresh0=1.5, 
> ntrials=2000)       
> 
> The r5970 version includes a number of tweaks:
> - threshold is now set to 2.5, ntrials is 2000
> - a couple of fixes for out-of-bounds errors related to the switch to the 
> sync65 routing that I experienced on my data set
> - new erasure probabilities for use with the simple “sf” symbol metrics
> - simplification of the codeword acceptance criteria in sfrsd2 and extract - 
> all acceptance tests moved into sfrsd2. 
> 
> I did many runs (my notes from this weekend include 25 runs with various 
> tweaks and changes) and concluded that, for my data, I got better results 
> using matched sf symbol metrics and erasure probabilities — ymmv. 
> 
> While performance is significantly better in r5970 than it was in r5955, the 
> overall number of decodes is still less than what it was back in r5922. On 
> the other hand r5970 is running much faster than r5922 did, because r5922 
> used ntrials=10000. 

I should add to this that the results quoted for r5922 were obtained only after 
lowering the thresh0 setting to 1.0 in that program.


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