[LAD] panning thoughts

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To: <linux-audio-dev@...>
Date: Friday, November 12, 2010 - 4:22 am

Hello,

I'm writing a synth module on top of jack and I'm starting to contemplate stereo.

I looked up "pan law" and understand that center should be -3 db (or some say -3.5 or 4.5, whatever) given unity at panned hard L or R. It was said that in an ideal room I should be down -6 db in the center. That would mean linearly transitioning from unity gain to completely off as one pans, I *think* (-6 db in the center = .5).

So that's one (very easy) way to go...

There was also mention of "equal power". Since power is proportional to signal squared, this means with parametrized L and R functions

L(t)^^2 + R(t)^^2 = 1, 0 <= t <= 1

We need an f(t) such that f(t) = L(t) and f(1-t) = R(t).

I played around this for awhile and using the sum of the square of sin and cos etc I got an f(t) of

f(t) = cos( pi * t / 2 ) (details available on request)

So L(t) = cos(t * pi / 2) and R(t) = cos((1 - t) * pi / 2)

And that seems to work out correctly.

Is this equal power version worth spending the processing cycles on? I intend to make pan envelope and LFO controllable so it's not going to be the case that the pan value can be thought of as relatively static.

Thoughts?
Thanks
Eric

PS now that I know what I'm looking for web search turned up this:
http://www.midi.org/techspecs/rp36.php

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Messages in current thread:
[LAD] panning thoughts, Eric Kampman, (Fri Nov 12, 4:22 am)
Re: [LAD] panning thoughts, Jens M Andreasen, (Fri Nov 12, 9:41 am)
Re: [LAD] panning thoughts, , (Fri Nov 12, 7:00 pm)
Re: [LAD] panning thoughts, Ralf Mardorf, (Sat Nov 13, 3:22 am)
Re: [LAD] panning thoughts, , (Sat Nov 13, 10:43 am)
Re: [LAD] panning thoughts, Eric Kampman, (Fri Nov 12, 3:14 pm)
Re: [LAD] panning thoughts, gene heskett, (Fri Nov 12, 4:47 pm)
Re: [LAD] panning thoughts, Arnold Krille, (Fri Nov 12, 10:46 pm)
Re: [LAD] panning thoughts, Folderol, (Sat Nov 13, 9:07 am)
Re: [LAD] panning thoughts, Paul Davis, (Sat Nov 13, 1:09 pm)
Re: [LAD] panning thoughts, Folderol, (Sat Nov 13, 2:57 pm)
Re: [LAD] panning thoughts, , (Sat Nov 13, 3:26 pm)
Re: [LAD] panning thoughts, Ralf Mardorf, (Sat Nov 13, 5:51 pm)
Re: [LAD] panning thoughts, Arnold Krille, (Sat Nov 13, 6:30 pm)
Re: [LAD] panning thoughts, Ralf Mardorf, (Sun Nov 14, 5:15 am)
Re: [LAD] panning thoughts, Arnold Krille, (Sun Nov 14, 3:04 pm)
Re: [LAD] panning thoughts, Folderol, (Sun Nov 14, 3:39 pm)
Re: [LAD] panning thoughts, Jens M Andreasen, (Sun Nov 14, 6:17 pm)
Re: [LAD] panning thoughts, , (Sun Nov 14, 11:37 am)
Re: [LAD] panning thoughts, Rui Nuno Capela, (Sun Nov 14, 11:17 am)
Re: [LAD] panning thoughts, Ralf Mardorf, (Sun Nov 14, 1:00 pm)
Re: [LAD] panning thoughts, Paul Davis, (Sun Nov 14, 11:27 am)
Re: [LAD] panning thoughts, Rui Nuno Capela, (Sun Nov 14, 4:02 pm)
Re: [LAD] panning thoughts, , (Sat Nov 13, 10:54 am)
Re: [LAD] panning thoughts, Ralf Mardorf, (Sat Nov 13, 1:18 pm)
Re: [LAD] panning thoughts, Philipp Überbacher, (Sat Nov 13, 5:07 pm)
Re: [LAD] panning thoughts, , (Sat Nov 13, 8:18 pm)
Re: [LAD] panning thoughts, James Morris, (Sat Nov 13, 8:25 pm)
Re: [LAD] panning thoughts, Philipp Überbacher, (Sat Nov 13, 10:44 pm)
Re: [LAD] panning thoughts, , (Sun Nov 14, 12:01 am)
Re: [LAD] panning thoughts, Remon Sijrier, (Mon Nov 22, 1:15 pm)
Re: [LAD] panning thoughts, , (Mon Nov 22, 2:36 pm)
Re: [LAD] panning thoughts, Remon Sijrier, (Mon Nov 22, 7:06 pm)
Re: [LAD] panning thoughts, Fons Adriaensen, (Mon Nov 22, 9:00 pm)
Re: [LAD] panning thoughts, David Olofson, (Sat Nov 13, 5:24 pm)
Re: [LAD] panning thoughts, Philipp Überbacher, (Sat Nov 13, 5:53 pm)
Re: [LAD] panning thoughts, , (Sat Nov 13, 3:04 pm)
Re: [LAD] panning thoughts, Ralf Mardorf, (Sat Nov 13, 5:30 pm)
Re: [LAD] panning thoughts, , (Fri Nov 12, 9:18 am)
Re: [LAD] panning thoughts, Eric Kampman, (Fri Nov 12, 3:11 pm)
Re: [LAD] panning thoughts, Ralf Mardorf, (Fri Nov 12, 5:40 am)
Re: [LAD] panning thoughts, Eric Kampman, (Fri Nov 12, 3:08 pm)
Re: [LAD] panning thoughts, Rui Nuno Capela, (Fri Nov 12, 3:44 pm)
Re: [LAD] panning thoughts, Ralf Mardorf, (Fri Nov 12, 4:20 pm)
Re: [LAD] panning thoughts, Ralf Mardorf, (Fri Nov 12, 3:32 pm)