Re: [wsjt-devel] 1.6.1 r5970 notes

Hi Joe In case it helps in looking for the differences between WSJT and WSJT-X it might be worth looking at what happens on JT65c. You might recall I found that the reduction in performance on WSJT-X compared to WSJT10 for convolutional decoding was only about 1 dB on JT65a about 6 dB on

Re: [wsjt-devel] 1.6.1 r5970 notes

Hi Steve, Sorry to say, my progress has been slow today. I wanted to start by reproducing your good-looking results using rsdtest. So far I have not really managed to do so; I can get as many good decodes as you reported, but not (yet?) with the sfrsd2.c attached to your email. Could you

Re: [wsjt-devel] 1.6.1 r5970 notes

Hi Steve, Thanks for being skeptical about implications of my conclusion that candidate selection is OK in r5970, at least for the simulated -24 dB "gnnf" files. I think your results make a strong case that while the correct candidates for decoding were identified in nearly all cases, the

Re: [wsjt-devel] 1.6.1 r5970 notes

Joe - I hope that you have received the zip file containing the versions of the key routines that produced the results that I reported yesterday. I sent it to your Princeton email because the attached zip file caused the list to bounce the message. For the record, just now I found that

Re: [wsjt-devel] 1.6.1 r5970 notes

Joe, > I conclude that for these files the candidate selection is OK > (preferably with a somewhat higher threshold for ntest), but sfrsd is > not decoding as many as it "should". I suspect that for marginal > signals either different metrics or different values in the probability > matrix

Re: [wsjt-devel] 1.6.1 r5970 notes

I have attached the sfrsd2.c that I used to produce the results reported below. Steve k9an sfrsd2.c Description: Binary data > On Oct 15, 2015, at 9:03 PM, Steven Franke wrote: > > Joe, > Reporting on results of this evening’s tests on -24db gaussian noise > no-fading

Re: [wsjt-devel] 1.6.1 r5970 notes

Joe, Reporting on results of this evening’s tests on -24db gaussian noise no-fading (gnnf) data. As always in these tests, the number of test files is 1000. I started with sfrsd2 from the current r5970 and opened up the acceptance criterion to nhard+nsoft<81. The purpose of doing this is to

Re: [wsjt-devel] 1.6.1 r5970 notes

Correction: > For these test files the "ntest" criterion is too stringent, so I > removed the test commenting it out. Then all 994 candidates are > submitted for decoding, and 662 produced valid decodes. I should have written "662 produced valid decodes with ntrials=1". -- Joe

Re: [wsjt-devel] 1.6.1 r5970 notes

Joe - > Do you think we may need to use > different erasure probabilities for HF and EME-like conditions? Sorry, I didn’t answer this question. Working in between appts and meetings here. My aim is to come up with erasure probabilities that will work reasonably well for both situations and,

Re: [wsjt-devel] 1.6.1 r5970 notes

Hi Steve, My tests with the 1000 SimJT files were done using a narrow frequency window, 1270 +/- 20 Hz. (The sync tone of the generated signal is at 1270.5 Hz.) The un-modified r5970 passed 992/1000 beyond the "thresh0" filter; 990 of these produced just one synchronized candidate, and two

Re: [wsjt-devel] 1.6.1 r5970 notes

Hi Steve and all, In coming days I hope to catch up with your work on sfrsd. I haven't yet tested r5970 under crowded-band, HF-style conditions. I did make a quick test on my group of single-signal 1000 files generated by SimJT, with S/N=-24 dB. The program ran well and was fast, but the

Re: [wsjt-devel] 1.6.1 r5970 notes

Hi Joe - Welcome back! Your results are consistent with mine. I got 488 decodes for the -24dB files using the current r5970. After mulling over the results for a few days, and after doing one more experiment (results to follow), I’ve concluded that the new candidate-identifying-scheme is

Re: [wsjt-devel] 1.6.1 r5970 notes

> On Oct 11, 2015, at 4:11 PM, Steven Franke 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. > >

[wsjt-devel] 1.6.1 r5970 notes

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 SoftDecoder