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Author Topic: New Bayesian Morse decoder available for alpha testing  (Read 863 times)
AG1LE
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« on: December 26, 2013, 11:15:43 AM »

Note: this is a cross-post from CW forum http://www.eham.net/ehamforum/smf/index.php/topic,94052.0.html

I have been working on a new Bayesian Morse decoder for FLDIGI for a while.
The goal was to have a CW decoder that adapts better to different operators rhytms, sudden speed changes, signal fluctuations and noise and still is able to decode Morse code fairly accurately.

While this software is not perfect and has some bugs I am happy to release this brand new version for alpha testing.  I finished the software integration to FLDIGI v3.21.75 and spent few hours listening bands.  Below is a small example of W1AW code bulletin at 3.58105 MHz  received with KX3 and a side by side comparison of legacy CW decoder  vs  Bayesian decoder:
http://ag1le.blogspot.com/2013/12/new-morse-decoder-part-2.html
and a picture proof:


The full source code is available in here: http://www.w1hkj.com/ag1le

In addition to Mike W0BTU who reported success http://www.eham.net/ehamforum/smf/index.php/topic,94052.msg723900.html#msg723900 I would like to get some additional alpha testers who are not afraid of compiling this code from sources,  playing with it, breaking it and hopefully also helping me to find the bugs. For example  - the noise level estimator (noise.c) needs some serious work.  If you have a algorithm that does the job better this would be one place to start improving.  Also, if you know Viterbi or Kalman filter algorithms like your pockets I would like to get help fixing a bug that appears in posterior probability calculations in probp.c occasionally.

Anyways,  happy holidays for all FLDIGI users and hope to work you over the radio.

73
Mauri AG1LE
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