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Re: A + (-B) = A - B ???

2006-02-13 by Tim Stinchcombe

Hi Martin et al,

> regarding the a134, it does a linear crossfade
> between left and right input signal, so:
> 
> center pos :  50% left signal and  50% right signal
> fccw pos   : 100% left signal and   0% right signal
> fcw pos    :   0% left signal and 100% right signal

I concur with this, and if you want a mathematical description of 
what is happening with the mix output, think of it as

(1-k)*L+k*R

where k varies from 0 to 1 as the pan control is rotated from 'left' 
to 'right', so with k=0: output = (1-0)*L+0*R = L,

Similarly, for k=1: output = (1-1)*L + 1*R = 0*L + R = R

k=1/2: output = (1-1/2)*L+1/2*R=1/2*L + 1/2*R

Hope this helps (?)

Tim

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