On 12/13/2014 2:24 PM, Carl Moreschi wrote:
Regarding DSP NR -
I have never found a case on any radio where copy was actually
improved by this function.
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In contrast, I have. In some cases, DSP NR has, for me, made the
difference between working a guy or not.
Unfortunately, as with so many other things in life, NR is a compromise
function, and, unlike money, a little goes a long way and having too
much is worse than none at all.
I have reaped significant benefit using both on-board and external DSP
NR. The goal, of course, is to increase "intelligibility" - but,
unfortunately, this usually comes at a cost (i.e., the compromise bit)
of degraded audio quality. The trick is to us just enough DSP NR to
improve intelligibility, but not degrade the overall quality that it is
worse than not using it at all. Some hams think they must turn every
knob to 10 to get their money's worth from a gadget or rig. For MY
ears, a LITTLE DSP NR has proven helpful, but too much is worse than
none at all. If it allows me to understand the other guy, then I will
accept some loss of audio quality.
I agree not all NR algorithms are created equal. NR can differ in
effect and efficacy between models in the same product line, as well as
between models from different manufacturers. The NR on the Omni VII
does not work the same as it does on the Orion II. The FTdx3000 is very
aggressive, but also very effective, the TS-590 DSP NR is totally
different sounding, but works well. I prefer the Omni VII NR on older
firmware releases (i.e., prior to ver 1.028) which was smoother, and
less aggressive than more current firmware settings. Other guys, of
course, prefer the more aggressive current approach.
Of course, DSP NR is no panacea for all noise issues, and often makes
matters worse, so it is, at best, a compromise and a cost-benefit mixed
bag. I use it when I think it helps, and not otherwise. Bottom
line: I would rather have it than not.
------------------------ K8JHR --------------------------------
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