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(io9)   Hail to the hypnocone. ALL GLORY TO THE HYPNOCONE   (io9.com) divider line 16
    More: Cool, DSLR, adverse effect  
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5697 clicks; posted to Geek » on 03 May 2013 at 12:17 PM (1 year ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



16 Comments   (+0 »)
   
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2013-05-03 12:22:22 PM
...we're linking to an animated gif in comments, now?
 
2013-05-03 01:48:07 PM
You think that's cool, check out this crazy animation I just discovered!

media.tumblr.com
 
2013-05-03 01:51:32 PM
WTF is this shiat?
 
2013-05-03 03:34:05 PM
dealbreaker.com
 
2013-05-03 04:23:11 PM

abhorrent1: WTF is this shiat?


Higher-order vibrations in a speaker diaphragm, which are actually a bad thing.  You want the speaker cone to move as closely as possible like a perfectly rigid object - imagine a piston in an engine block.  When the cone wobbles like this it produces destructive interference and limits the dynamic range of the speaker.

In other words, this is a crappy speaker.
 
2013-05-03 04:35:34 PM

Robo Beat: abhorrent1: WTF is this shiat?

Higher-order vibrations in a speaker diaphragm, which are actually a bad thing.  You want the speaker cone to move as closely as possible like a perfectly rigid object - imagine a piston in an engine block.  When the cone wobbles like this it produces destructive interference and limits the dynamic range of the speaker.

In other words, this is a crappy speaker.


It helps if you actually read what's going on. This isn't a second order vibration, this is a rolling shutter distortion
 
2013-05-03 04:42:57 PM

the_sidewinder: Robo Beat: abhorrent1: WTF is this shiat?

Higher-order vibrations in a speaker diaphragm, which are actually a bad thing.  You want the speaker cone to move as closely as possible like a perfectly rigid object - imagine a piston in an engine block.  When the cone wobbles like this it produces destructive interference and limits the dynamic range of the speaker.

In other words, this is a crappy speaker.

It helps if you actually read what's going on. This isn't a second order vibration, this is a rolling shutter distortion


Oh so it is.  My bad.
 
2013-05-03 05:01:53 PM

Robo Beat: Oh so it is.  My bad.


But now I want to see a high speed video of a second order vibration
 
2013-05-03 05:11:38 PM

Robo Beat: When the cone wobbles like this it produces destructive interference and limits the dynamic range of the speaker.


The cone isn't wobbling, it's an image artefact created by the rolling shutter.
 
2013-05-03 05:13:04 PM

BarryJV: The cone isn't wobbling, it's an image artefact created by the rolling shutter.


Also, always refresh before posting.
 
2013-05-03 05:34:08 PM

the_sidewinder: Robo Beat: Oh so it is.  My bad.

But now I want to see a high speed video of a second order vibration


Depending on the shape and construction of the speaker, it can look like that, or the "wobbling" will be radial, with circular standing waves setting up in the speaker diaphragm.

A few years back I did some work for a certain speaker manufacturer (whose name might rhyme with a feature of your face), and in the technical file they sent us were some nifty videos of their computer simulations.  At musical frequencies, third- and fourth-order vibrations are slightly more troublesome, but they kind of look the same, except with more peaks and valleys.  Designing the speakers to control these higher-order vibrations is evidently a hot area of research acoustics nowadays, especially where they're trying to make speakers smaller and smaller to fit in computers and flat-panel TVs without sacrificing too much sound quality.
 
2013-05-03 05:42:36 PM
Did you guys know that this isn't a higher order vibration?

That it is just a beat created by filming at a different rate than the speaker was vibrating?
 
2013-05-03 05:58:25 PM

StopLurkListen: ...we're linking to an animated gif in comments, now?


we're trying to become Reddit apparently
 
2013-05-03 06:30:10 PM

KillAllHumans: StopLurkListen: ...we're linking to an animated gif in comments, now?

we're trying to become Reddit apparently


Didn't mention Ron Paul. Downvote.
 
2013-05-03 10:26:38 PM
Mmmmm, Hypnocones . . .

inhabitat.com
 
2013-05-04 11:35:23 AM
I kept waiting for something interesting to happen.
 
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