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Audio Frequency Doubler

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Postby aaronngray » Wed May 30, 2007 12:00 am

I am after an artical from about 20 or more years ago.

It doubled the frequence of an audo signal. It was based on a four quaderant multiplier and some phase shifters.

Basically from the formula sin(x) * cos(x) = 2 sin(2x)

I would be very greatful if anyone remembers this artical or indeed has a copy of it.

Many thanks in advance,

Aaron
aaronngray
 
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