linuxaudio.org

On 11/12/2010 03:08 PM, Eric Kampman wrote:

quoted text
> Thanks. I don't understand the square root though. The equation is even

> more expensive processor-wise than the straight cos.

> 

the SQRT2 is a constant := sqrtf(2.0f), usually defined as M_SQRT2 in

"math.h"
qtractor computes the panning coefficients each turn they get changed.

then it applies through regular gain to each steaming channel as usual.

just const mul over a vector/block/buffer, whatever
> Granted, you're quoting someone else, but maybe someone out there knows.
i'm no expert but i'm sure Ralf quoted me :)
>

quoted text
> On Nov 11, 2010, at 9:40 PM, Ralf Mardorf wrote:

>>

>> In January Rui at Qtractor devel-list wrote:

>>

>> stereo panning in qtractor follows an "approximated equal-power"

>> trigonometric formula: L = SQRT2 * cos(pan * PI/2); R = SQRT2 * sin(pan

>> * PI/2), where pan value ranges from 0 (full-left) to 1 (full-right).

>>

seeya

--

rncbc aka Rui Nuno Capela

rncbc@rncbc.org

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