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#17
January 27th 04, 10:25 PM
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Yea. Easy.Steve N.
"Mike Andrews" wrote in message ... Steve Nosko wrote: ...With audio, pulses are easy except how do you keep the target from hearing it's own echo and "oscillating by itself...? Block the RX input for a few ohnoseconds[1] longer or use subcarriers - this is a little harder. Transmit an FM modulated tone (carrier, say 10KHz, tone 1KHz) and transponding it back on another carrier, say 15 KHz. Might be a useful alternative. Have to have sharp filters. Who was it that used to sell the sonar modules from the cameras for experimentation Polaroid, IIRC. [1] The shortest possible unit of time: the interval between hitting the "do it" key and the realization that you shouldn't have. -- I swear to god, if people treated their cars they way they treat their computers, half the cars on the road would be covered in bumper stickers advertising porno, and their trunks would be filled with rotting garbage. -- Christian Wagner |
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