Re: [LAD] Mixing audio: Implementing pan and balance

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To: Tim E. Real <termtech@...>, The Linux Audio Developers' Mailing List <linux-audio-dev@...>
Date: Thursday, March 14, 2013 - 10:42 am

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.

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.

best,

jörn

--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487

Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT

http://stackingdwarves.net

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Messages in current thread:
[LAD] Mixing audio: Implementing pan and balance, Tim E. Real, (Tue Mar 12, 5:23 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Fons Adriaensen, (Tue Mar 12, 9:56 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Tim E. Real, (Tue Mar 12, 8:25 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Fons Adriaensen, (Tue Mar 12, 9:22 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Tim E. Real, (Wed Mar 13, 8:16 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Paul Davis, (Wed Mar 13, 11:34 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Paul Davis, (Tue Mar 12, 8:28 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Tim E. Real, (Tue Mar 12, 9:15 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Geoff Beasley, (Tue Mar 12, 9:41 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Tim E. Real, (Tue Mar 12, 7:08 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Jörn Nettingsmeier, (Thu Mar 14, 10:42 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Tim E. Real, (Fri Mar 15, 11:57 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Paul Davis, (Thu Mar 14, 11:37 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Jörn Nettingsmeier, (Thu Mar 14, 6:50 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Ralf Mardorf, (Sat Mar 16, 10:17 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Fred Gleason, (Sat Mar 16, 11:51 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Ricardus Vincente, (Sat Mar 16, 7:47 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Paul Davis, (Sun Mar 17, 10:54 am)
[LAD] OT: Mixing audio: Implementing pan and balance, Ralf Mardorf, (Sat Mar 16, 2:20 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Paul Davis, (Sat Mar 16, 1:25 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Fons Adriaensen, (Sat Mar 16, 6:23 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Raphaël BOLLEN, (Sat Mar 23, 5:05 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Raphaël BOLLEN, (Sun Mar 24, 8:07 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Raphaël BOLLEN, (Sun Mar 24, 8:46 am)
Re: [LAD] Mixing audio: Implementing pan and balance, hermann meyer, (Sun Mar 24, 9:50 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Raphaël BOLLEN, (Sun Mar 24, 10:10 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Jörn Nettingsmeier, (Sun Mar 24, 12:57 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Fons Adriaensen, (Sun Mar 24, 11:57 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Raphaël BOLLEN, (Sun Mar 24, 1:01 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Fons Adriaensen, (Sun Mar 24, 3:11 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Raphaël BOLLEN, (Sun Mar 24, 4:18 pm)
[LAD] zita-mu1 denormals, Fons Adriaensen, (Wed Mar 27, 11:48 am)
Re: [LAD] zita-mu1 denormals, Raphaël BOLLEN, (Wed Mar 27, 2:21 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Ralf Mardorf, (Sat Mar 16, 8:28 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Ralf Mardorf, (Sat Mar 16, 10:21 am)
Re: [LAD] Mixing audio: Implementing pan and balance, Paul Davis, (Thu Mar 14, 7:01 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Tim E. Real, (Tue Mar 12, 7:21 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Paul Davis, (Tue Mar 12, 7:13 pm)
Re: [LAD] Mixing audio: Implementing pan and balance, Tim E. Real, (Tue Mar 12, 7:44 pm)