natural slap echo

[Ian Fritz]

This sounds similar to the well-known "whispering galleries". Possibly the
radius of the bowl is at the floor, so that upward-going waves are
re-focused back to the source. It can't be louder than the source, of
course, but you could get that illusion since you expect echos to be rather
weaker.

  Ian


----- Original Message -----
From: Martin Czech <martin.czech at intermetall.de>
To: <synth-diy at mailhost.bpa.nl>
Sent: Wednesday, December 15, 1999 5:29 AM
Subject: natural slap echo


> I was in Dresden these days, and I noticed a remarkable echo effect in
> the Dresden-Neustadt railway station lobby.
>
> (btw.: the AMD semiconductor fab IS also impressive).
>
> The ceiling is allmost bowl shaped (callotte sp?), and if you are in
> the center of symmetry, you can hear echos which seem to be louder even
than the
> the original noise!  I have never heard such a destinct, clear and loud
> echo effect in my life, except for DSP echos, of course.
>
> Great fun, tapping with shoes, rumbling with suitcase, shouting.
>
> Any explantion for this extraordinary effect?
> I know that symmetry enforces all kind of resonances, and that
> it is to be avoided by all means for building loudspeaker cabinets.
>
>
> Some day my audio obsessions will make me carried away by white men.
>
> btw.: is a kid i noticed a funny record an the British Forces Radio BFBS.
> The text was : They're trying to take me away, hahah ....
>
> Is there somebody who knows this? What's the name?
> Was it BFBS custom?
>
>
> m.c.
>
> (in the land of natural echo)
>
>