I don't think any automatic noise reduction system is intended for use
on Morse code. The way to reduce noise on that is to use a narrow filter.
NR is really only intended for speech (or in the wider world, music).
The key characteristic is that only a small part of the spectrum is
important at any one time, but that part is continually changing.
NR systems try to work out which parts of the audio spectrum are
important and which are not, and construct filters to remove the latter.
For CW anything other than the immediate area around the signal is
unimportant, and it is not continually changing.
The only way you could do better with Morse is by recognizing the signal
and regenerating it as a pure keyed tone.
The human brain and ear are actually rather good at noise reduction; the
problem is that they tire easily. NR attempts to make listening less
tiring, not to change a signal from unreadable to readable.
--
David Woolley
On 16/06/2019 07:39, Dave wrote:
The K3 noise reduction is very poor, I have never found it useful on SSB,
and certainly not on CW.
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