envelope follower

[Rob O]

At 08:45 07/10/97 CST6CDT, CGS2510.SEP.STUDENT.UCA at CUB.UCA.EDU wrote:
>> > Unfortunately not! I had thought about this my self, but recent
investigation
>> > shows, that when you square a signal like a1*sin (w1*t)+ a2*sin(w2+t)
you get 
>> > a1^2*sin^2(w1*t)+2*a1*sin(w1*t)*a2*sin(w2*t)+a2^2 sin^2(w2*t)
>> > since (a+b)^2 = a^2+2ab+b^2  :-< (the old binomial pitfall)
> 
> 
>> Hang on a moment, 
>> you have squared the amplitude, but what about the frequency components.
This 
>> is mathematically a 2D problem which requires complex multiplication.
> 
>> There will be sum and difference components of the frequencies.
>
>
>Wait up! I cannot hear complex tones, only real ones. 


yes you can, actually. :)

R