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. Case 8 shows that we can obtain 83 more decodes by lowering the threshold to 1.5, but execution time increases significantly because of the larger number of spurious syncs. Also, comparison of cases 6 and 7 shows that the percentage of total decodes obtained using sfrsd2 is almost 20% in r5970, and is higher than previously seen with kvasd or sfrsd in r5922. Steve k9an ------------------------------------------------------------------------------ _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
