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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: How does a mixer work?
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Date: Tue, 22 Oct 2002 13:53:41 GMT
NNTP-Posting-Date: Tue, 22 Oct 2002 06:53:41 PDT
Kevin Aylward wrote:
> The mathematics "prove" that there is an inherent measurement problem in
> the real world. You cannot measure frequency 100% accurately, without
> taking infinite time.
No, you are reversing the implication. The "proof" of your statement
requires inserting an underlying physical context which is not in the
mathematics. The physical context spuriously inserted is physical
measurement error. However, that has no mathematical context so when
examining the mathematics, I am at liberty to ignore it. And I did in my
square wave modulation example. We are at odds because I don't see any
point in a physical context in defining amplitude modulation. The
physical context comes from application and I might take an interest in
it if I had to design a TV transmitter.
In my work, there is quite often a chicken and egg problem. I am given
an actuator and sensor pair but not the physical measurements. I must
then design without reference to any physical measurement and then make
measurements after on the chance I may need to make an adjustment. When
I do the physical measurements, they are ambiguous because there are
physical happenings that are strictly modulation process but even though
the carrier is known, the sideband frequencies cannot tell me the
frequency of the modulation.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons email@example.com
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