has panning been programmed?

[hellleutel]

Hello

I'm building a plugin where I need to pan a mono audio between two outputs.

What I did is patch it to both outputs and multiply each side by something: 1 and 0 for left, 0 and 1 for right, o.k.,... but 0.5 and 0.5 for center is too soft. So this has to be what? Logarithmic somehow?

Can someone tell me if I find that in an already built plugin or how a formula for a sensible pan law would be?

Thanks!

Uli


EDIT: solved! For final version see below.

[dscro]

Yeah, I think it is logarithmic. Would a simple way to do it be to use the linear to dB and/or dB to linear converter modules? I gotta think about this one.

[eesn]

you could go [1*left, 1*right] for middle, [0*left 1*right] for hard right, vice versa for hard left?

[hellleutel]

you could go [1*left, 1*right] for middle, [0*left 1*right] for hard right, vice versa for hard left?

that would be too loud in the middle. well I'm afraid it is logarithmic, so god have mercy on me

[hellleutel]

EDIT: solved! For final version see below.


---

I put the file to

http://www.bestsharing.com/files/kSdiUI ... a.zip.html

so maybe someone else will have mercy on me

BTW this filesharing service seems like a viable storage solution as long as there is no official one.

see you


Uli

[funkadil]

Do some research about panning laws.

http://www.samplecraze.com/tutorial.php?xTutorialID=35

http://www.eqmag.com/article/how-are-things/Mar-05/7200

http://en.wikipedia.org/wiki/Pan_law


I'm not sure where any code examples are but there is probably some open source plug or application somewhere that you should be able to reference.

[hellleutel]

Do some research about panning laws.

o.. yes

So if I want the Left channel to be reduced by 6 db when a signal is panned to center and by -oo db when panned to the right side.
Don't know how to do that. I thought "research is great, asking the group is even better". Anyway I can live somehow without it.

best

Uli

[dscro]

I'll try it this afternoon after work. I think I can figure out the math.

[dscro]

OK I figured out the pan law problem. I made a -3dB pan law plug which could easily be turned into a -6dB pan law plug. I haven't exported the plug or made a GUI and the the pan control is currently a slider instead of a knob - thought I might like that for a change. Anyway, if you want to go ahead and make a nice gui with a big knob etc go for it.

A lot of variations on this theme are possible with different mappings to get from a center pan to a hard pan setting, even with just a -3dB pan law. The function used can be different than the square root curve I used and could give a whole different feel to playing with the panning knob even though the extremes and center would remain the same.

the sb file is called: Pan_Law_Minus3dB.sbc

and an explanation of the math is provided as a pdf: Pan_Law_Explain.pdf

Both files are posted at http://dscrofani.junker.org

This turned out to be a fun and interesting project. I learned a heck of a lot about pan laws.

[hellleutel]

This turned out to be a fun and interesting project. I learned a heck of a lot about pan laws.

cool. Thank you, that's even a much more simple solution than I was expecting.


My final version (no time for creation of a cooler GUI) of "Allapanna"

http://www.bestsharing.com/files/RSklRI ... t.zip.html

Have a nice time!

uli

[zmix]

I've come up with a circuit which allows both -6 and -3dB pan laws.

I wish this forum allowed posting of images or attachments (read LAME LAME LAME!!!)

Basically a slider is given a value of -1 to +1

The slider output is fed to the LEFT chain:

constant subtraction, value = 1
negation
absolute value
constant multiply value = 0.5

This resulting signal feeds the "b" input of the LEFT audio multiplier.


The RIGHT signal chain is:

constant addition, value = 1
absolute value
constant multiply value = 0.5

This resulting signal feeds the "b" input of the RIGHT audio multiplier.


If you want a -3dB law, insert a 'square root' module after the 'constant multiply' module on each channel

I built one which uses a comparator to switch between the two laws.

CZ.[/img]

[dscro]

Alright. Nice. I totally agree about not having a nice central place to post files and pics etc. We have to find a place.