Spectrum sound illusion

[lontvany]

restart it :) it is cool

[Maccus89]

i say what what in the butt

[manofnofixedinstrume]

In musical terms, we are playing a note that covers an ovtave. This note is then stepped up to the next musical note. After it has stepped up all 12 semitones of the octave, then it repeats itself since the octave is actually two notes doubled anyway. (i.e. A-440 Hz and A-880 Hz) Similar to playing every note in a musical scale. (Ask a piano tuner he can explain it.)

[Ashes2dust90]

ok, maybe its just me but i kept rewinding it after the first dun-dun,and it sounded the exact same to me. I did it like 12 times in a row,just kept rewinding and listening to the first two pitches,that is. And i don't know why but it sounded the same again and again.gah.i'm no fun

[Pdi1983]

There´s something that not work correctly. You can appretiate how the delta with higher frequency increase in frequency. That's not true. I think that the error is in representation. You can't mix time with frequency domain. If you represent the signal in frequency domain, you should transform the complete signal in time. You can't transform "on the fly". This is false mathemathically

[jonathanh95]

erm...wa?

[Hyduk87]

Wow... quite "trying" to sound smart... at the very best, make your point more intelligible...

If you notice, each "dun-dun" set has a spike that is larger than any other. This is the note that we distinguish and understand to be what's played. However, if you notice there's smaller spikes at different frequencies? Those are called "harmonics." If they weren't present, a note would sound like a pure tone, boring and bland (listen to a tone generator).

[Hyduk87]

When the video is repeated, the brain "desires" so much to hear the chromatic scale continue to climb that the base tones are suddenly "drowned out" and the harmonics (those frequencies at the higher levels) are what the brain then focuses on. Watch a spike climb upward. Then when it's repeated, look at where the spike ended... there's a smaller spike (a harmonic) that started there. You can continue to repeat the video and watch the spike climb until it is off the screen.

[BlockDuuuuude]

Which is why if you restart the video in the middle or so, you aren't focusing on the frequency to hear the higher pitch, causing you to believe that there is no illusion in place.

[sutasman]

@Hyduk87: Yeah thats a pretty good explanation. Its called a shepard tone if you are more interested.

[gayanrs]

Of course you can transform on the fly. You may need to learn some more... :-) No offense.

[sutasman]

@Pdi1983: Uh dunno what you're talking about but if your saying that the sound from the vid is false, then I can tell you its not. Its called a shepard tone. Many sites will tell you how it works, and if that fails then I can explain it to you.

[NearbyHermit]

Actually,it's the same sound on different tones,it is a short sound,it all results from those different tones,which our brain captures them as a whole new thing,a different sound,more pitched!

Simply said,we hear a different thing,due to 2 reasons:

-When the simple sound ends at 0:28,the simple sound starts is you replay it!

-If you hear the same thing again and again,our brain cant process that and treats it different,it's just like on the PC ,no same named files!

[sutasman]

@NearbyHermit: Uh no idea what you are on about, but its called a shepard tone and its not nearly as complicated as what you've tried to describe. Its simply a set of notes spaced one octave apart and increasing in pitch over several bars. The volume of the lowest and highest pitched notes is purposely made less, so you really hear the midtones, and not where the sequence repeats at the end.

[NearbyHermit]

@sutasman My keyboard failed me that day !

I suppose you're right, but this video is bad .

[sutasman]

@NearbyHermit: Yeah there are plenty of better vids on it, although you'd be best to look it up elsewhere if you want to really know how it works.

[rattytatt521]

simonroos the scale is to prove that the pitches arent getting higher

[attila3453]

that scale is bugged...

[djlinuxvideo]

awesome !!! :P

[djmufasa83]

try listening to it ones and after that replay it the begining is diffrent then you heard it the first time

[simonroos]

I dont get it?

[haril007]

LOOOOOOOOOOOOOL Look up Shephard's scale ; )

[flamerboy122]

if you press replay at the end your brain will think it keeps getting higher piched

[2305674]

man its awsome :D