From: Paul Scriver (paulscriver@earthlink.net)
Date: Fri May 14 2010 - 09:26:19 EDT
This is one of the best sources for birdsong - somewhere in the
Cornell Lab of Ornithology web materials there is a streaming
spectrogram of the bird songs.
http://www.allaboutbirds.org/guide/search
Paul Scriver
http://www.paulscriver.com
paulscriver@earthlink.net
On May 14, 2010, at 8:49 AM, Julian Stein wrote:
> and if a sports fan....
>
> http://en.wikipedia.org/wiki/Vinkensport
>
>
> On Fri, May 14, 2010 at 8:36 AM, Kevin Austin <kevin.austin@videotron.ca
> > wrote:
>
> And for more on the physics ...
>
> http://www.cs.sfu.ca/~tamaras/pubs/asa_02.ps
>
> Kevin
>
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> +++++++++++
>
> Abstract
>
> THE SYRINX: NATURE’S HYBRID WIND INSTRUMENT Tamara Smyth, Julius O.
> Smith Center for Computer Research in Music and Acoustics
> Department of Music, Stanford University Stanford, California
> 94305-8180 USA tamara@ccrma.stanford.edu, jos@ccrma.stanford.edu
>
> This research presents a model of the avian vocal tract, implemented
> using classical waveguide synthesis and numerical methods. The vocal
> organ of the songbird, the syrinx, has a unique topography of
> acoustic tubes (a trachea with a bifurcation at its base) making it
> a rather unique subject for waveguide synthesis.
>
> In the upper region of the two bifid bronchi lies a nonlinear
> vibrating membrane – the primary resonator in sound production.
> Unlike most reed musical instruments, the more significant
> displacement of the membrane is perpendicular to the directions of
> airflow, due to the Bernoulli effect. The model of the membrane
> displacement, and the resulting pressure through the constriction
> created by the membrane motion, is therefore derived beginning with
> the Bernoulli equation.
>
> 1. INTRODUCTION
> The pure, often high pitched, tone of the songbird is undeniably
> flute-like. Yet the theory that the song bird produces its sound
> using an aerodynamic whistle effect much like in the flute, has been
> widely confuted [7, 1, 2]. Rather, it has been determined that the
> avian vocal tract uses a nonlinear vibrating membrane as its primary
> excitation mechanism. The syringeal membrane, much like the vocal
> folds in the human vocal tract, forms a vibrating valve, the output
> of which is filtered by the trachea which amplifies and attenuates
> certain modes of the vibrating membrane.
>
> ...
>
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> +++++++++++
>
>
>
> On 2010, May 14, at 8:28 AM, Julian Stein wrote:
>
> > I cam across this the other day -- some of them are pretty
> interesting.
> >
> > http://www.stanford.edu/~kendric/birds/birdsong.html
> >
> > Julian
> >
> > On Fri, May 14, 2010 at 8:24 AM, Kevin Austin <kevin.austin@videotron.ca
> > wrote:
> >
> > And you can play many samples at the same time setting up quite a
> birdophony.
> >
> >
> > Kevin
> >
> >
> >
> > On 2010, May 14, at 5:23 AM, Peter Hudston wrote:
> >
> >> Something interesting though it seems all of the recordings are
> low quality mp3's. But the spectrograms I saw are quite cool...
> >>
> >> http://www.xeno-canto.org/
> >>
> >> Enjoy!
> >>
> >>
> >>
> >> 30 days of prizes: Hotmail makes your day easier! Enter now
> >
> >
>
>
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