All this has tickled something at the back of my memory. I'm sure I read a paper or an article many
years ago about using the clapper board sound to try and correct the sound on old movies - but I
can't currently track it down - anyone else remember it?
Dave
On 09/10/2011 22:33, Fons Adriaensen wrote:
On Sun, Oct 09, 2011 at 02:01:50PM -0500, David Pickett wrote:
At 04:39 09/10/2011, Fons Adriaensen wrote:
On Sun, Oct 09, 2011 at 10:16:22AM +0100, dave.mal...@york.ac.uk wrote:
Does anyone know, of the top of their heads,
if a film set type clapper board reliably provides a positive going
leading edge to it's impulse? I can't see it not, but I'd prefer that to
be confirmed by repeatable experiments.
I wouldn't rely in it. There's some air being squeezed out, but
that would be a low-F thing. The real 'clap' is the sound of two
pieces of wood hitting each other - I wouldn't make any guess
as to the polarity of that wavefront.
There would be a progressive increase in pressure as the angle between
two pieces of wood decreases, but do the pieces of wood themselves really
make a sound as they hit each other, other than the sound of air being
squeezed out? Is this any different from clapping or bursting a paper
bag?
There is a difference. With the paper bag you have an overpressure
inside the bag which is suddenly released. A similar thing happens
when clapping your hands - try doing it such that there is no closed
volume between the hands, it doesn't make much noise. A clapper doesn't
have a closed volume.
Ciao,
--
These are my own views and may or may not be shared by my employer
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