I did a little test and had WSJT-X offset my WAV file by 300ms. This idea would allow custom correction of Dt values beyond just accurate time. So audio delays could be allowed for. I do believe this would be a very worthwhile addition to WSJT-X and may explain why people have been having problems decoding FT-4 (like me). I was running PowerSDR and with all the buffer sizes and delays needed to prevent dropouts I was getting .6 and .7 Dt values.I've recently upgraded to Thetis where audio processing has improved so you see times here of around .3 I found an example running FT4 just now where this picks up a decode for example since KK4HEG was 0.7 seconds off apparently.180000 -12 0.1 563 + CQ EA6XQ JM19 ? a1180000 -11 -0.0 900 + YO7CVL KS4OT EM83 180000 -1 -0.4 1941 + CQ KK4HEG EM95 Instead of the non-offset version180000 -12 -0.2 570 + CQ EA6XQ JM19 ? a1180000 -11 -0.3 900 + YO7CVL KS4OT EM83
The original 2.1.0-rc5 wav file(base) (QT-5.9) C:\Users\mike\AppData\Local\WSJT-X\save >\WSJT\wsjtx\bin\jt9 --ft8 -d 3 190506_170345.wav 170345 -1 0.3 208 ~ K0CYA KM4UJI R+06170345 0 0.3 330 ~ UA3PAB KA5HET EM25170345 -8 0.2 483 ~ K4WDY W5GOL EM25170345 -3 0.5 608 ~ N9XHN W2GC FM03170345 -8 0.3 784 ~ K3HW KB6PR DM14170345 -12 0.4 843 ~ VE2FZP W2RHS FM29170345 2 0.4 1064 ~ AA6DY W8HFJ -15170345 -6 0.6 1121 ~ K7OAC N3TRF FM09170345 -13 0.3 1512 ~ CQ CQ W3CCB FN01170345 -12 0.4 1554 ~ W9MDB WO3H -12170345 4 0.5 1611 ~ CQ AH6FF EM64170345 -12 0.4 1687 ~ UA3PAB W4MMP FM19170345 -20 0.7 1738 ~ CQ KA1AQP FN42 a1170345 -2 0.5 2006 ~ M0HAQ K0BLT DN81170345 -17 0.4 2176 ~ CQ SP9KR JO90170345 -10 0.4 2232 ~ F4ECA KB1EFS -15170345 -13 0.3 2490 ~ CQ DX KK5ZV EL29170345 -7 0.3 607 ~ IK4LZH N3XKB DM65<DecodeFinished> 0 18 With the 300ms offset done for the FT8 test with one line of code just before the wav file is written memmove((void*)data,(void*)&data[3600],sizeof(short)*samples-3600); if (!wav.open (BWFFile::WriteOnly) (base) (QT-5.9) C:\Users\mike\AppData\Local\WSJT-X\save >\WSJT\wsjtx\bin\jt9 --ft8 -d 3 "..\..\WSJT-X - test\save\190506_170345.wav"170345 -1 0.1 208 ~ K0CYA KM4UJI R+06170345 0 -0.0 330 ~ UA3PAB KA5HET EM25170345 -8 -0.1 483 ~ K4WDY W5GOL EM25170345 -3 0.2 608 ~ N9XHN W2GC FM03170345 -8 -0.0 784 ~ K3HW KB6PR DM14170345 -12 0.1 843 ~ VE2FZP W2RHS FM29170345 2 0.1 1064 ~ AA6DY W8HFJ -15170345 -6 0.3 1121 ~ K7OAC N3TRF FM09170345 -12 -0.0 1512 ~ CQ CQ W3CCB FN01170345 -12 0.1 1554 ~ W9MDB WO3H -12170345 5 0.2 1611 ~ CQ AH6FF EM64170345 -12 0.1 1687 ~ UA3PAB W4MMP FM19170345 -20 0.4 1738 ~ CQ KA1AQP FN42 a1170345 -1 0.2 2006 ~ M0HAQ K0BLT DN81170345 -17 0.1 2176 ~ CQ SP9KR JO90170345 -10 0.1 2232 ~ F4ECA KB1EFS -15170345 -13 0.0 2490 ~ CQ DX KK5ZV EL29170345 -7 0.0 607 ~ IK4LZH N3XKB DM65<DecodeFinished> 0 18
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