At 12:53 PM 9/17/99 -0400, you wrote:
{Quote hidden}>On Thu, 16 Sep 1999 13:39:35 -0400 "Robert A. LaBudde" <
EraseMEralKILLspam
LCFLTD.COM>
>writes:
>
>>
>>It is my understanding that a sound generated from a single point
>>would
>>propagate by spherical (not hyperbolic) waves, which can be
>>approximated by
>>plane waves at long distances from the source.
>>
>
> True, I'd expect the sound to travel out in a sphere. However,
>the curve you get where the DIFFERENCE in distance to two points is a
>constant is a hyperbola. Let's see if I can remember it... I think it's
>
> 1 = x^2/a^2 - y^2/b^2
>
> You get various conic sections by messing with this. The minus
>makes it a hyperbola. Change it to a plus and you get an ellipse where a
>and b are half the length of the axis. Make them equal and they are the
>radius of the circle.
>
Seems to me that givena reasonably sensitive receive circuit all you would
have to do would be to have a directional detector, and slew it around on
some kind of gimbal....
-Erik Reikes
{Quote hidden}
BY
:
Erik Reikes email (remove spam text)