[Elecraft] [K3] K3 NR

[Bill W4ZV]

David Woolley (E.L) wrote:
> 
> The main source of published research on real time noise reduction of 
> audible signals seems to be the hearing aid industry.  I just came 
> across this article suggesting that hearing aid noise reduction 
> strategies make people think that the noise is less sever, but don't 
> actually make the signal any more intelligible.
> 
> Trends in Amplification, Volume 10, No. 2, June 2006: Acceptance of 
> Background Noise, Mueller et al. 
> <http://tia.sagepub.com/cgi/reprint/10/2/83.pdf>
> 

That's an interesting article David!  It agrees with my feelings over the
many years I've tried various types of noise reduction.  Sometimes I think
we're fooled by the level changes introduced by NR, when in fact we could
probably do as well simply by turning AF Gain down a little.  

A few years ago when NQ5T and I both had Orions, I challenged Grant to
measure the actual S/N with NR on and off.  At narrow bandwidths, there was
no difference in measured S/N.  Of course this was for CW where NR simply
builds a narrow filter around a discrete signal.  

I believe a filter is a filter is a filter...whether crystal, DSP or NR. 
There is no magic.

73,  Bill

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