Grant,
I should be much more careful in defining my terms. That way I would be
less likely to make confusing remarks !
When you say that bandwidth reduction (by whatever means) is a true form of
noise reduction, I must agree.
If you say that automatically reducing bandwidth, using some sort of digital
processing is a true form of noise reduction, I must again agree.
When I was talking about DSP, I was talking about a form of noise reduction
that cannot also be accomplished by analog means. In other words, bandwidth
reduction can be accomplished (and often has been accomplished) by using a
set of band pass filters. No processing needed or wanted. You can do this
with a computer too, but it is not what I call DSP.
In the context of this discussion, I have been referring to processes that
occur by manipulating the digitized signal in such a way the the unwanted
content - INSIDE the pass band - is deleted, while the remaining content
inside the pass band is allowed to remain.
That said, I am no wiser about what Ten Tec does. We have not heard from
them. I understand that you say that at least a part of what they do is to
narrow the bandwidth. That is fine and good. What else do they do ? That
I don't know.
73 de Gary, AA2IZ
----- Original Message -----
From: "Grant Youngman" <nq5t@tx.rr.com>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Friday, December 08, 2006 10:36 AM
Subject: Re: [TenTec] Noise Reduction Setting
> > Likewise, the phrase "building a filter around the signal"
> > which has been used in several posts in various forms does
> > not mean that there is an actual pass band being established.
> > I've seen that language used elsewhere as a simplified
> > explanation of DSP, referencing the more familiar analog of a
> > filter, instead of trying to explain the math, etc, of true
> > DSP noise reduction.
>
> In the v1 Orion it is most definitely the case. It's clearly observable
on
> a spectrum analyser, and isn't just the "analog thinking" of a newbie.
This
> is as much "true DSP noise reduction" as any other DSP-based process
> targeting the task.
>
>
>
> Grant/NQ5T
>
> _______________________________________________
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> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
>
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