h a l f b a k e r yA dish best served not.
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Animal auditory systems have orders of magnitude better sensitivity and performance than any microphone we'll be able to engineer anytime soon. Use animal cochlea, selectively bred from only the finest and hardiest of cochlea in order to last with minimal upkeep. Auditory nerves are fairly regular so
it shouldn't be a problem doing the biological->digital conversion. One could also record the neural impulses for the audiophiles that demand that the signal not be converted from biolog.
Use multiple species for greater frequency range - Elephant+Human+Bat for example.
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So there would be a living organism somehow joined with a mechanical device? One special David Cronenberg croissant, then! |
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OK, so you use this microphone to record sounds that standard mics cannot 'hear'. How do you listen to them?
Pastry for the title. |
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Reading the first sentence, I was convinced this was going to be a [Vernon] idea. Croissant for the surprise. |
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angel: some frequencies are too low to hear, but you sure can feel them. |
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<shudder> I feel much safer with electronics. What next - tennis racket made of cat guts? Oh, we've done that one? </shudder> |
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Scene in recording studio: "I'm afraid we can only record blues numbers today - my microphone's feeling a bit under the weather." |
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Pastry just for the mental image of Dan Rather pontificating into a large, floppy elephant ear. |
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Actually, we already have non-biological microphones that are sensitive to these extended ranges. The only advantage these "biophones" might have is better spectral linearity than what we have built today. But if we put as much effort into achieving spectral linearity outside the range of human hearing as we have inside that range, then I have no doubt we would match performance there too. |
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By the way, these microphones are generally used for industrial processes, proximity detection, and medical imaging. |
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[angel] -- You hear these sounds the same way that you see images from infrared and ultraviolet cameras. The raw input signal is shifted (and possibly compressed) into the range that human senses can handle. With sounds, you can amplitude modulate the raw signal, and then demodulate it using a different frequency carrier. This will shift the signal to a higher or lower frequency band. (One of my professors built a "bug's ear" high-frequency listening device using exactly this method.) |
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-alx, If it had been one of Vernon's - it would have read:
Animal auditory systems have orders of magnitude BETTER sensitivity AND performance than ANY microphone we'll be able to engineer ANYTIME soon. |
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And I wouldn't have been able to read the name of the author without scrolling down for about 5 minutes either... |
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'Genetically modify'. Boned. |
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But it will taste oh so nice. |
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A colleague found a dead bat on her stairs yesterday. |
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Probably not; there was not a mark on it, certainly no evidence of de-cochlearization, or such. Junior cat is the prime suspect. |
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With electronics you can hetrodyne the high frequency with a signal 1KHz higher, filter out the difference frequency and listen to your signal within the human audio range. |
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Sorry Rush, we're right out of bat ears. We do have these lovely cochlea developed from federally-funded stem cell research though. |
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Excellent idea. Agree with comments by BigBrother on general lack of need for actual biological sensor to get frequency range. Also, I expect most but not all of the fancy signal processing stuff we can't but would like to do, goes on in the bat's brain rather than cochlea. HOWEVER, one could definitely obtain better performance and visual impact by attaching real bat ears (external ear or pinna) to an ordinary microphone. The bigger the better. |
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