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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