How would one create an audio effect of spinning?

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EvanTheHuman
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How would one create an audio effect of spinning?

Post by EvanTheHuman » Tue Aug 20, 2013 8:59 pm

Hi there. Please excuse me if this isn't the correct place to post this, I'm new to the forums, but not new to Audacity. I know everything is to know about it. :D
Anyway, If someone could help me, that would be awesome.

How would I create the illusion of a sound spinning around your head when wearing headphones?
For example, It starts in front of you, then turns around to the left ear, then the back, then right, then front.

Thanks so much, I've heard it, and I want to know how it's done.

-Evan The Human

kozikowski
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Re: How would one create an audio effect of spinning?

Post by kozikowski » Tue Aug 20, 2013 9:14 pm

It's the 'behind you' part that kills. I don't know that there is a standard way to make sound do that.

Is the original a stereo signal?

Koz

Trebor
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Re: How would one create an audio effect of spinning?

Post by Trebor » Wed Aug 21, 2013 12:10 am

"Dual-tape-decks" plugin produces something close ...
around head ish.mp3
(804.9 KiB) Downloaded 220 times
dual tape decks settings for around head-ish effect.png
dual tape decks settings for around head-ish effect.png (9.29 KiB) Viewed 3363 times
But it needs something to cyclically modify the equalization for a "behind the head" illusion.

[ of course this type of binaural effect is only going to work on headphones ]

EvanTheHuman
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Re: How would one create an audio effect of spinning?

Post by EvanTheHuman » Wed Aug 21, 2013 2:45 am

Hey, that's really cool, Trebor.

I finally found the song that makes for a GREAT example of what I'm trying to do.
Here: http://www.youtube.com/watch?v=ZsQ6AS5rR-U

Would that be made the same way?

Robert J. H.
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Re: How would one create an audio effect of spinning?

Post by Robert J. H. » Wed Aug 21, 2013 7:40 am

It is very tricky to produce binaural effects from "scratch". Even if recorded, not all people are able to localize the intended directions, especially front and back.
I've included some spinning effects in a plug-in. They are rather intended for speakers, but they might suit your needs anyway.
I will consider if it is possible to integrate a adaptive filter to enhance the back/front impression (Blauert bands).
spin_effect.mp3
"Rotary speeding up"
parameter for final speed:
20 (* 90) degrees/s
(622.6 KiB) Downloaded 16292 times
Here's the newest plug-in version 1.4
The help is not complete yet, but it might suffice to just play around.
rjh-stereo-tool.ny
2D Stereo Toolkit v1.4b
(28.89 KiB) Downloaded 159 times
The original thread:
http://forum.audacityteam.org/viewtopic ... 13#p216689

steve
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Re: How would one create an audio effect of spinning?

Post by steve » Wed Aug 21, 2013 8:14 am

kozikowski wrote:It's the 'behind you' part that kills. I don't know that there is a standard way to make sound do that.
To do it accurately there's some fancy (complicated) calculations involved for working out delay, amplitude and filter coefficients. However, just applying a sinusoidal sweep to the pan position and a little "low pass" filtering when the sound is "on the other side or behind your head" will probably work sufficiently well.
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)

steve
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Re: How would one create an audio effect of spinning?

Post by steve » Wed Aug 21, 2013 10:02 am

9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)

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