[LAD] panning thoughts

[gene heskett]

On Friday, November 12, 2010 11:43:42 am Eric Kampman did opine:

> On Nov 12, 2010, at 1:40 AM, Jens M Andreasen wrote:
> > On Thu, 2010-11-11 at 20:22 -0800, Eric Kampman wrote:
> >> Since power is proportional to signal squared, this means ..
> >> .. L(t) = cos(t * pi / 2) and R(t) = cos((1 - t) * pi / 2)
> > 
> > I think you misspelled one sin(), no?
> 
> No, turns out the 2nd equation is equivalent to sin(t * pi / 2) I think.
 
And is computationally less expensive if you drop the pi / 2 and use 
pi * 0.5 as mulls cost less than divs.  Or at least this is true if its not 
handed off to an FP processor. ;-)

> > It is a complex mul you really want - where L+R is the real and L-R is
> > the imaginary. You can have the sin/cos pair very cheaply by using an
> > LFO that works by rotating iself by some complex constant.
> 
> Great idea. Will use. Thanks.

-- 
Cheers, Gene
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