h a l f b a k e r yCompound disinterest.
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Teachers would like the second idea. The heavy boots of doom. |
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Noise canceling, where you play a sound wave that adds to the existing sound wave to cancel it out, depends on the position of the listener - unless you exactly match the source of the noise. So, you can do that for one ear of one person in the room, but not for everybody. |
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The second half of the invention, shoes that make sound effects, has already been posted at least twice - see the other ideas in the Fashion: Shoe: Audio category. |
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if the noise canceling mechanism is located close to the source of the noise generation it is easier to cancel and you can have success damping the noise for more than on individual at a time. |
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Not to mention the fact that as long as it works from the shoe wearers perspective mission accomplished. |
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how about the Brazilian roomba awfully similar to the hair mazer? |
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and I thought that this was the "half" bakery |
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POST IT NOTE !!!!!!!!!!
glue already exists, paper already exists
suppose you would mark that for deletion too |
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someone posts an idea for for custard filled breast implants and they get buns |
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what do i get? intense scrutiny and pressure to follow the letter of the laws that you established from every direction.
oppressive, despotic abuse of authority |
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thanks for the bun UB
and for understanding |
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btw i like the custard implant idea too
i am concerned the filling would need preservatives |
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//Noise canceling.... depends on the position of the
listener.// |
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Depends. Or at least it should. |
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If you have noise coming from many sources, then a noise
canceller will only work for one listener (one position) - it
detects the sum of incoming noises and creates an anti-
wave; but a listener elsewhere will be hearing the noises
at a different time, and hence needs a different noise-
canceller. |
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BUT if you have noise originating from a single source, it
should be possible to cancel it from a point close to that
source (close compared to the wavelength of the sound)
for all listeners. |
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Imagine a stone dropped into a pond, creating a series of
concentric ripples. If you dropped another stone into the
pond very close to the first one and at just the right time,
you would create an opposing set of ripples which would
cancel out the first ones at source, and nothing would
spread. The cancelling won't be perfect, since the first
and second stones aren't in exactly the same spot, but it
could be pretty good. |
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Sound at (say) 1kHz has a wavelength of about 30cm, so
your antinoise generator would need to be only a very few
cm (a fraction of a wavelength) away from the noise-
making part of the shoe in order to be effective. Higher
frequencies (shorter wavelengths) would be harder to
cancel effectively. |
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In conclusion, you can cancel all of the noise for one of
the people, and you can cancel one of the noises for all of
the people, but you can't cancel all of the noises for all of
the people. |
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[EDIT - bugger. I just realized that vfrakis pointed this
point out pointedly in a point he made earlier.] |
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