natural slap echo OT OT OT....

[Harry Bissell]

Tricky and subtle... I make two assumptions... The Dome is at least 10-20 ft
away (giving a return echo time of 20-40mS. If it were closer echo is not a
issue... right. And that the noise source is only 5 feet away (on a six foot
tall human ???) OK maybe 5.5'... Sound will still be losing intensity with
distance so I still expect the return echo to be perceived as quieter... but I
see how it's possible it might be heard as louder under some strange conditions
(and a elliptical or parabolic room is a little strange...)

:^) Harry

Ian Fritz wrote:

> 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...)