[TenTec] Noise Reduction Setting

[Gary Hoffman]

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 at tx.rr.com>
To: "'Discussion of Ten-Tec Equipment'" <tentec at 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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>