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From: Don Pearce
Subject: Re: How does a mixer work?
Date: Sat, 19 Oct 2002 07:59:41 +0430
References: <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com>
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On 18 Oct 2002 19:15:40 GMT, firstname.lastname@example.org (Richard
Steven Walz) wrote:
>In article ,
>Don Pearce wrote:
>>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) =
>Is this a gag? Aren't YOU the "Telecommunications Consultant"?
>If not you could have gotten it from the thread so far.
No, Steve. You are the only person here who has stated that when you
add sine waves you effectively multiply. This was an invitation to
demonstrate this ridiculous claim. We all knew you couldn't do it, of
course, so perhaps now is the time to back down gracefully and admit
you were talking nonsense?
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