On Thu, Mar 14, 2013 at 6:42 AM, Jörn Nettingsmeier < netti...@stackingdwarves.net> wrote:
> On 03/12/2013 08:08 PM, Tim E. Real wrote: > > But having said that, yes I'm wondering about a true 'stereo pan' feature. >> How would such a feature work? >> > > there is no one true stereo pan. > > a pan law for intensity stereo (i.e. a panned image or an XY coincident > microphone pair) would increase one channel and decrease another such that > the total energy remains constant. a cosine/sine law is usually used, > because > > cos^2 + sin^2 = 1 > > ardour3 attempts to do this, by allowing you to reduce the width (by > introducing crosstalk), and then letting you move the compressed image left > or right. sort of works, but only for pan-potted stuff. > > a pan law for run-time stereo (i.e. spaced omnis) would have to use > delays, leaving the original level intact. > > the ardour3 panner gets this type of signal horribly wrong, because you > _never_ want to introduce crosstalk in spaced omnis - instant > comb-filtering hell. > > for stereo techniques that incorporate both run-time and intensity, such > as ORTF, NOS, EBS, you-name-it, you need different amounts of gain change > _and_ delay. > > that's why nobody wants to use a ready-made stereo balance control - it is > almost guaranteed to do the wrong thing for the source material at hand. > git add libs/panners/spaced_omni_panner git commit git push :)
_______________________________________________ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev