In sci.physics Skywise wrote:
wrote in :
Which leaves building something like a solid state video camera for
audio.
One could build a 32X32 pixel audio imager with 1,024 cheap microphones
like these for $0.27 in quanties of 1,000:
http://www.mouser.com/catalog/specsheets/KT-400332.pdf
Follow those with a little amplification/buffering, a switch matrix, and
dump the output into a PC sound card with appropriate software.
And voila, you have an audio imager.
With this design you'd need an audio input for every microphone.
A typical sound card only has 2 inputs (stereo) so you'd need
512 audio cards. And then processing all those signals? Yikes!
No, you don't.
You make up a switch with 16 16-1 FET mux chips and a little logic to
make either a single 1024-1 switch and feed it into one channel of a PC
sound card or 2 512-1 switches and feed it into the L-R channels of a
2 channel sound card.
Rather, have a microcontroller scan your 1024 inputs and send
the values to the PC via USB, where software then assembles the
input into an image.
Show me the microcontroller that has 1024 analog inputs.
That's why you build the switching, to scan the microphone outputs.
OH, very important point. Each pixel would be generating a value
based on sound volume. Frequency would have to be discarded,
No, it wouldn't.
What the hell do you think a sound card processes?
You get all of amplitude, frequency, and phase.
so
this would be a 'monochrome camera'. You could expand to three
inputs for each pixel with each of a different bandwidth, then
that could give you 'color' when represented as RGB.
Or you could just analyze the frequency information from the microphones
with the sound card and have an essentially infinite number of "colors".
--
Jim Pennino
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