[sdiy] harmonic generator

[Scott Gravenhorst]

Actually, what I was thinking was more of a physical
modeling of the gearbox.  Unfortunately, the fundamental 
trigonometric identities work only on pure sine and 
cosine waves.  a simple example of this is the use of a 
4 quadrant multiplier to square a sine wave giving a DC 
offset sinewave signal at exactly twice the frequency of 
the input.  There's also an identity for tripling as well
as general ones.  Implementation requires too much
perfection of the physical parts we would use to make
it practical IMHO, however, I would love to be proven
wrong about that.

Glen <mclilith at ezwv.com> wrote:
>At 02:37 AM 2/21/02 , Scott Gravenhorst wrote:
>
>>What you'd need is the electronic analog of a big
>>gearbox that has output shafts at 1, 2, 3, 4, etc
>>times the input RPMs...
>
>Are you suggesting driving a synchronous motor with an amplified version of the
>original frequency, and connecting that synchronous motor through a series of
>gears to a group of generators? Once again, you would have a portamento effect,
>but at least you could generate sine waves this way.
>
>Somewhere, the ghost of Laurens Hammond is smiling at the thought of this.
>
>
>later,
>Glen
>

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