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, -- FA _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
