yes speech is best (the only negative going sound we can make is om, which should be said while breathing in. umashankar
i have published my poems. read (or buy) at http://stores.lulu.com/umashankar > From: geoffreybar...@mac.com > Date: Mon, 10 Oct 2011 10:13:58 +0100 > To: sursound@music.vt.edu > Subject: Re: [Sursound] Soundfield-type mics: inverting or not? > > > On 9 Oct 2011, at 17:00, sursound-requ...@music.vt.edu wrote: > > > > Message: 7 > > Date: Sun, 9 Oct 2011 09:39:36 +0000 > > From: Fons Adriaensen <f...@linuxaudio.org> > > Subject: Re: [Sursound] Soundfield-type mics: inverting or not? > > To: sursound@music.vt.edu > > Message-ID: <20111009093936.gb11...@linuxaudio.org> > > Content-Type: text/plain; charset=us-ascii > > > > 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. > > With larger clapper boards it is a bit of a mess, especially if you are a > long way from the mic. > > Dog training clickers (search dog clicker on Amazon) work very well; you can > get a pretty good idea of the frequency response too by an fft as the click > is quite sharp and short. Drilling a hole in the back of it helps. The one I > use produces a better click when you release the button than when you press. > They are hopeless for dog training, our labrador regards it as a cue to grab > the clicker from my hand and run off with it. > > Peter Fellgett used to burst a balloon (compressed air, not helium) at centre > stage. This always produces positive pressure. > > Actually, with speech you can usually see polarity (we speak using positive > pressure, usually), so just talking to the mic from centre stage is better > than nothing. > > Geoffrey > > > > > If you have a piece of bubble plastic around, making on of the > > bubbles burst should produce a 'positive' pulse... > > > > Ciao, > > > > -- > > FA > > > > > > > > ------------------------------ > > > > _______________________________________________ > > Sursound mailing list > > Sursound@music.vt.edu > > https://mail.music.vt.edu/mailman/listinfo/sursound > > > > > > End of Sursound Digest, Vol 39, Issue 4 > > *************************************** > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <https://mail.music.vt.edu/mailman/private/sursound/attachments/20111010/9435bc06/attachment.html> > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20111010/030386f1/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
