On 26/01/2018 05:26, Paul Black via wsjt-devel wrote:
And when I can hear it, see it on the waterfall display and it doesn't
decode, It would be good to have the option of knowing why. I would
like a display showing the data received from the packet and an
indication of how far it got through the error correction,
decompression and decoding process.
I wonder if anyone else would be interested in this level of detail?
Hi Paul,
that might be more difficult than you think. WSJT-X does give a bit more
information for some modes, for example the modes commonly used for EME
have a mechanism to display the detection of sync patterns, the first
step in decoding a signal, and the "quality" of that sync detection. The
MSK144 decoder provides some statistics of the number of frames
averaged, the number of bits corrected by FEC, and the coherence of the
signal being decoded, but this information is only provided for
successful decodes.
In modes like WSPR and those used commonly on HF for QSOs, where
multiple signals are being decoded, there would be far too much
information to be useful, if for example we listed every decode attempt
that yielded no decode there would be hundreds or even thousands of
events to report per good decode. In general it is probably only
practical to provide a bit of quality information with the successful
decodes. The steps you list above are always completed if a decode
attempt passes the decoding threshold apart from the critical first
error correcting reconstruction step. Before that step the data is just
a big number with little relationship to a human readable, or useful,
message.
Related to this is one of the decoder algorithms used in WSJT-X,
particularly for FT8 and MSK144, that always yields a decoded message
which is then filtered for correctness by checking a checksum embedded
in the message. So the obvious statistic of checksum failed would occur
for every bit of noise, QRM , or birdy that invoked a decoding attempt.
73
Bill
G4WJS.
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