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From: Don Pearce
Subject: Re: How does a mixer work?
Date: Fri, 18 Oct 2002 08:03:57 +0430
References: <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
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On 17 Oct 2002 21:44:09 GMT, email@example.com (Richard
Steven Walz) wrote:
>>>People use "mix" rather loosely in RF. Actually, a modulator multiplies.
>>>A true audio mixer merely adds. Now when you add sinusoids you can wind
>>>up doing an effective multiplication, but that's merely a side-effect.
>>Pardon? That would be a piece of maths that is new to me. Please
>Sorru, invert that. multiply<->addition. If you don't know this go to
Could you please explain this explanation? What should I invert, and
what does multiply<->addition mean?
As I said, this maths is new to me. I'm a bit too old to go back to
school at this stage, but I would like to know. I've tried adding sine
waves in Mathcad, and for the life of me I can't wind up doing an
effective multiplication - addition appears to be the limit. Perhaps
you could supply a right hand side to this equation to illustrate the
a sin(2 pi f1 t) + b sin(2 p f2 t) =
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