Modern communications technology has decoders that can rapidly adapt to changing clock rates (floppy/CD/DVD drives are a good example). A more significant problem with Morse is rapidly varying signal levels in real life communications. However, if the technological effort that goes into other communications technologies were put into decoding Morse,I assure you that the resultant hardware would do far better than humans.
-- Dean On 2005-10-09 09:07, Patrick Lindecker wrote: > Hello to all, > Here is an extract of one of my paper (about CCW). > 73 > Patrick > * > > Problems with the automatic decoding of the traditional Morse > > * > > For a computer, Morse is seen as a sequence of bits having either "0" > or "1" for value, a bit being as long as a dot. > > For example, the letter "A" (‘di dah’ followed by a 3 dots duration > blank or '- --- ') will be recognized as being the sequence > '10111000', if, conventionally, the value "0" is associated to the > absence of carrier and the value "1" to the presence of carrier. If > all CW transmissions would be standardized on the characteristics of > character keying and speed (say 20 wpm), the decoding would not be > complicated. > > However, in the reality, characters are keyed in a more or less > regular way and the speed can be situated between 10 and 50 wpm and > may vary during the QSO. So, the decoder cannot rely on a definite bit > duration and must then, permanently, determines the more probable bit > duration, which makes the decoding difficult. This is why, at the > present time, the CW decoding by Morse specialist is better than > software decoding . > > *__* > > *_Note_*: to equal the human decoding, it would be necessary, no > doubt, to abandon the bit notion and to recognize CCW characters in > the same way as characters written by hand are, I mean with neural > networks leaning on a learning realized upon a set of different types > of keying, speeds and signal-to-noise ratios...a big program! > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> The K3UK DIGITAL MODES SPOTTING CLUSTER AT telnet://208.15.25.196/ More info at http:///www.obriensweb.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
