From Newsgroup: alt.ham-radio.morse
rick_harrington@hotmail.com wrote in news:
t716d3lm9uftcfrvh292bkb8g83rr2c6vk@4ax.com:
Question: Are there any programs that will convert morse code audio
(mp3 or wav) to text?
Yes. Quite a number in fact. They work best on perfect code, but some
use adaptive algorithms to get a better "read."
If I remember, the October 1975 issue of Byte magazine had a morse
program for the 8008 processor that read the code by timing mark and
space durations. I rewrote it for the 8080 and added a very rudimentary
DSP filter to clean off short noise bursts and then added an adaptive algorithm to time out dot, dash, inter-element, inter-character and
inter-word spacings and it worked pretty good an good code. Could even
copy some pretty terrible code where the dot-dash ratio was more like 1
to 2 or less instead of the correct 1 to 3.
But one day I heard a loud signal on 80m CW and tuned it in. The
computer very faithfully copied the guy calling NNGT NNGT NNGT DE EMAE
[CH], etc. etc.
It was a WA1 calling CQ with an utterly horrible "swing."
Most good multi-mode sound card software today has a CW mode that will
copy morse.
--
Dave Oldridge+
ICQ 1800667
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