Ultrasonic Heterodyning

Wm Perry ( (no email) )
Sun, 31 Jan 1999 21:51:33 -1000

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Hi all!
I know that if two sound waves are beat together, you get the two =
originals, the sum and difference waves.=20
Question: If you beat the output of two ultrasonic transducers, can =
the difference be heard if it is within the audible range? =20
EXAMPLE: Two transducers, 1 at 40KHz, the other at 39KHz are next to =
each other pinging away. Will you hear the 1KHz difference, or must your =
acoustic detection abilities be in the ultrasonic to hear the beat?
BillP

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Hi all!
    I know that if =two sound=20waves are beat together, you get the two originals, the sum and =difference=20waves.
Question:     If =you beat=20the output of two ultrasonic transducers, can the difference be heard if =it is=20within the audible range? 
EXAMPLE:     Two =transducers, 1 at 40KHz, the other at 39KHz are next to each other =pinging away.=20Will you hear the 1KHz difference, or must your acoustic detection =abilities be=20in the ultrasonic to hear the beat?
BillP
 
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