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Sound may be recreated by playing back pulses of constant amplitude, properly placed. See link for a coding method deviced by Roman Black. It may also be recalled that some very high quality converters for digital audio use a single bit stream.
So a speaker can be devised by creating explosions at
a high enough frequency, and filtering, or muffling, the resulting stream of explosions.
The NEELCO(tm) explosive speaker consists of a combustion chamber followed by a large horn and some sound filtering inside it to shape the frequency response. Vaporised gasoline and air mixture from a carburettor is fed to the chamber and ignited by a spark plug, which is controlled by the bit stream derived from music according to the algorithm devised by Mr. Roman Black.
Sound encoder software home page by Roman Black
http://www.romanblack.com/picsound.htm
Shows how to encode high fidelity music in a single bit stream [neelandan, Oct 05 2006]
Yamaha have an integrated circuit driving a speaker with pulses
http://www.global.y.../2004/20040831.html
So eliminate the middle man, and produce the pulses by more efficient means! [neelandan, Oct 06 2006]
Halfbakery: The Expode O Phone
The_20Explode_20O_20Phone
Similar? [jutta, Oct 06 2006]
Booooooom!-When loudpeakers catch fire
http://musicthing.b...ers-catch-fire.html
[Dub, Oct 09 2006]
(O.T) Mutually assured destruction
http://musicthing.b...inch-subwoofer.html
60" Subwoofer [Dub, Oct 09 2006]
Related technology
http://www.swtpc.co...e_Amplification.htm
Flame Speaker from 1968 [csea, Oct 09 2006]
Rubens Tube
http://musicthing.b...nt-involves_11.html
[Dub, Oct 12 2006]
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Annotation:
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[jutta] Similiar in the manner of exiting the sound resonator. |
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But in the linked idea the explosions set an acoustic resonator into oscillation on a single note (plus harmonics). This idea utilises the filtering effect of an acoustic transmission line to attenuate the higher harmonics and so provide sound approximating to the digital representation. |
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Can a gasoline flame be ignited and quenched in 20 microseconds? This would be necessary for high fidelity reproduction. (1/44kHz~= 20usec.) |
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Might require catalytic conversion of exhaust products and an exhaust tube. |
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See [link] for analog flame loudspeaker from the 1960s. |
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[Dub] Thank you! I built one of these using a bunsen burner and a 6V power transformer. It worked, but the noise of the burner was almost at the level of the audio. |
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I do recall seeing commercial flame loudspeakers at an Audio Engineering Society convention in the early '70s. |
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The guys all look so, well..., hip. |
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If you are willing to give up the constant amplitude part, you might be able to modify an ink jet print head to pump out a flammable liquid into an air stream with a glow plug. Or for ramp up, a fuel injector from a car. |
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Great links, [Dub], though I couldn't check out the videos. I'm on a slow dialup. And I should try the flame amplification linked to by [csea]. |
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