natural slap echo

[Ian Fritz]

Ah, Harry -- that's where I was confused at first. Of course the total
return power (intensity integrated over all directions) cannot be larger
than the total outgoing power (intensity integrated over all directions).
But that's not the question. The question is what is the intensity at the
ear. The ear may subtend a larger solid angle "looking" at the dome than
"looking" at the source, so the echo may have the higher intensity. As
Martin pointed out, it is somewhat like a telescope, where the main lens (or
mirror) gathers more light than the naked eye can. A tricky point!

  Ian

----- Original Message -----
From: Harry Bissell <harrybissell at prodigy.net>
To: Haible Juergen <Juergen.Haible at nbgm.siemens.de>
Cc: Ian Fritz <ijfritz at earthlink.net>; Martin Czech
<martin.czech at intermetall.de>; <synth-diy at mailhost.bpa.nl>
Sent: Friday, December 17, 1999 12:00 AM
Subject: Re: natural slap echo


> I guess it depends on how you look at it...
> The "receiver" has much higher gain...
> and the Transmitter has focused all its "information" in a useful
direction...
> So signal to noise is excellent...
> BUT there is still less signal at the receiver than was transmitted. The
sound
> can never be louder than the source...
> (otoh it would be louder than usual...)
> :^) Harry (NOW SHOUTING... now whispering...)