how FlDigi does it HERE
why you need a slow or no AGC for RTTY decoding HERE
Fldigi source code: CW and RTTY decoding HERE
FREEDV
http://freedv.org/tiki-index.php
CW
Machine recognition of hand sent Morse code incl. C source, by Loftur, GNU GPL3 HERE
GUENTHER, J.A. (1973): Machine recognition of hand-sent Morse code suing the pdp-12
computer. - Air Force Institute of Technology Wright-Patterson Air Force Base,
Ohio. HERE
Arduino Morse code decoder incl. C source HERE
ZHANG, R.B., HE, L.G. & X.-Y. LI (2006): Automatic detection and recognition of Morse
signal in strong noise environment. HERE
WU et al. (2010): Design and Implementation of Morse Code Recognition Based on
Finite State Machines. HERE
WANG et al. (2016): An Automatic Decoding Method for Morse Signal based on
Clustering Algorithm. - Advances in Intelligent Information Hiding and Multimedia
Signal Processing pp 235-242. HERE
PSK31
PSK31 decoding and encoding, source code under GNU GPL HERE
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