[talisman42]

YouTube - Amazing AUDIO illusion

This is crazy. Optical illusions I've seen, but this is a first for me

 

[roadcykler]

Oh my. That is cool.

 

[earthpeople]

That's pretty cool.

 

[talisman42]

This wouldn't be a good track to use for AB testing

 

[Scott549]

Clearly there is some sort of a "burn-in" effect going on. The sound coming out of my computer speakers is changing properties due to the physical makeup of the components. There is a slight change each time the video is played.

 

[dnullify]

nope, it's all in your head.

i began to realize what was going on after my 5th time... yes i sat there listening for 5 times.

 

[Bilavideo]

It's not a burn-in effect. It's a trick. You're not hearing a single tone. You're hearing two: a high tone and a low tone played simultaneously. Then the scale goes up one-half step.

As these two notes are an octave apart, the low tone finishes out one-half step away from where the high-tone started. When you play the recording a second time, the high tone sounds like the completed progression of the low tone. Your mind is fooled into thinking the low tone is continuing onward and upward.

What about the original high tone? It can't continue. When you start the recording over, it can't go an octave higher. Looking for it, the mind finds it repeated as the low tone. This is hardly continuous, but the mind makes the leap. Why? Because it recognizes a tonal match and it wants to continue the rhythmic pattern. And before it can recognize the mismatch, the pattern continues: two tones, one octave apart, with a rhythmic progression at one-half step higher and higher.

 

[DeusEx]

Apparently called a Shepard tone.

 

[talisman42]

Quote:

Originally Posted by Scott549 /img/forum/go_quote.gif Clearly there is some sort of a "burn-in" effect going on. The sound coming out of my computer speakers is changing properties due to the physical makeup of the components. There is a slight change each time the video is played.

x2

 

[thechungster]

Damn that's pretty cool.

 

[Scott549]

Quote:

Originally Posted by Bilavideo /img/forum/go_quote.gif It's not a burn-in effect. It's a trick. You're not hearing a single tone. You're hearing two: a high tone and a low tone played simultaneously. Then the scale goes up one-half step. As these two notes are an octave apart, the low tone finishes out one-half step away from where the high-tone started. When you play the recording a second time, the high tone sounds like the completed progression of the low tone. Your mind is fooled into thinking the low tone is continuing onward and upward. What about the original high tone? It can't continue. When you start the recording over, it can't go an octave higher. Looking for it, the mind finds it repeated as the low tone. This is hardly continuous, but the mind makes the leap. Why? Because it recognizes a tonal match and it wants to continue the rhythmic pattern. And before it can recognize the mismatch, the pattern continues: two tones, one octave apart, with a rhythmic progression at one-half step higher and higher.

Yes, I believe that is correct. Or at least it would be if it were not for the fact that my computer speakers are still burning in.

 

[yumigator]

Pretty cool. After one replay, though, I couldn't hear it anymore, probably because I was listening too hard for it.

Quote:

Originally Posted by DeusEx /img/forum/go_quote.gif Apparently called a Shepard tone.

I think the Shepard tone is something different.