Hello all,
I read in the general summary in the SM7CMY report:
"It was found that:
- The ability to recognize telegraphy masked by noise decreases with increasing
telegraphy speed;
- A low frequency improves recognition. There is a hearing level for best
recognition;
- Best recognition is obtained with the telegraphy signs 180 degrees out of
phase between the ears with the masking noise in phase;
- In hearing-impaired telegraph operators, the critical bandwidth is affected
but not the phase phenomena;
- A human telegraph operator outperforms the electronic decoders at low
signal-noise ratios;
- Detection of trains of tone pulses masked by noise improves when the duration of
the tone pulses is increased and when the duration of the gaps between the tone
pulses is decreased. Thresholds of trains of pulses can be predicted by a formula
that accounts for the total energy in the train."
I have been in touch with the author and he is positive to publishing the
material on the www.
There are 120 pages to scan in case the original files are not available.
/Regards
Christer
sm6pxj
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