Thank you Bill, Jerry, Sinisa, Lin and others for the debate about NR.
It did help my understanding!
What I read in these responses is that many of us see filtering /bandwidth
reduction as the sole means of improving the ability to recover information
from noise. I feel this misses the point that I am exploring. In his 1948
landmark paper, Claude Shannon extends the work of Nyquist and Hartley.
Significatly Shannon refers to statistical processes and entropy (the degree of
randomness) of a signal. In the case of CW some of that processing takes place
in our heads. This says to me that data processing ability ultimately becomes
key to signal recovery and as there is a clear difference in the entropy of
coded data vs analog voice, those processes should be different. I very much
doubt that deep space communications relies on bandwidth reduction alone
What I fail to understand is the claim by users of Linrad and Winrad that DSP
noise reduction is improved by processing noise in a much wider band than the
signal itself. It appears to be born out by examples, I just don't know why...
73 Gert, OE3ZK
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