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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
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Subject: Re: How does a mixer work?
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Date: Tue, 22 Oct 2002 12:23:31 +0100
NNTP-Posting-Date: Tue, 22 Oct 2002 12:23:37 BST
"Fred Bloggs" wrote in message
> Chuck Simmons wrote:
> > At this point I take a stand against the hidebound conventionalism
> > is the application of mathematics to engineering. I am very
> > this because I have no engineering education whatever and ALL
> > mathematical statements engineers make can be considered suspect
> > of the hidebound conventionalism.
> > Consider the equation:
> > (1+sin(w1*t))*sin(w2*t)=sin(w2*t)+(sin((w2-w1)*t)+sin((w2+w1)*t))/2.
> > This is really an identity. The left hand side says that the carrier
> > varies in amplitude according the the operations on the field of
> > numbers. The second says that, fully equivalently, there are three
> > constant frequencies and amplitudes.
> > It is pure hidebound conventionalism that says that though the two
> > of the equation are correct, the right hand side is more correct.
> > mathematical hogwash. There can be no justification for that sort of
> > narrow thinking.
> If the early developers adopted your perspective, there would be no
> sideband communication.
I do actually remember some stories like this, vaguely. Apparently,
people were sceptical that sidebands were real, and that if you had a
really sharp filter you could still recover the modulation. This was, I
understand even experimentally "proven". In reality, they just did not
use a sharp enough filter.
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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