[PD] Avian syrinx revisited

[Mike McGonagle]

Andy, thanks for these things. Your stuff is always very enlightening!
Mike


On Wed, Feb 20, 2008 at 11:23 PM, Andy Farnell <padawan12 at obiwannabe.co.uk>
wrote:

> Avian syrinx revisited
>
> Synthetic birds have been done quite a bit, by Tamara Smyth (pressure
> impedance),
> Seppo Fagerlund (a three port waveguide) and Hans Mikelson ( a csound FM
> version ) [BTW if anybody else has got published models I don't of please
> let
> me know.]
>
> http://ccrma.stanford.edu/~tamara/publications/
> http://www.acoustics.hut.fi/research/avesound/pubs/akusem04.pdf
> http://www.csounds.com/ezine/winter2000/realtime/
>
> I first put a tutorial on the syrinx up on my site 2 years ago
> after copying Hans FM/AM version from Csound to Pd and then messed
> with waveguide models and adding different beaks and trachea with some
> success.
>
> http://www.obiwannabe.co.uk/tutorials/html/tutorial_birds.html
>
> But the one thing kept evading me, squawking birds. Oscines are singing
> birds
> with a highly developed syrinx, and those are the ones everybody studies
> and
> tries to emulate. Turns out oscines are the easier ones to create. But
> "working
> class birds", crows, pigeons, ducks and seagulls are a different problem.
> I live by the sea and when they're not stealing my chips, seagulls fly by
> my room taunting me saying "come on then.. make a seagull sound!", but I
> could
> never work it out. Seagulls 1: Andy 0
>
> Well I fixed that, I think.
> Thanks to some papers by these chaps, Suthers, Fee and Fletcher
> it was time to have another look at the syrinx.
>
> http://www.indiana.edu/~songbird/pubs/publications_index.html
> http://web.mit.edu/fee/Public/Publications/Fee_etal1998.pdf
>
> Starting with Tamaras pressure analysis again I decided to start making
> each
> bronchus separately as a  pulse source then feed an FM stage with
> feedback. I guess this is the same as using FM with a complex modulator,
> but
> the feedback gets a semi chaotic effect which is what Fletcher suggests is
> behind the squawk of birds with bigger lungs and smaller syrinx.
>
> Here's the results (with background to situate them - all
> synthetic scenery as usual)
>
> First the regular oscines in a forest (with some recent insects)
> http://www.obiwannabe.co.uk/sounds/effect-rainforestbirds.mp3
>
> Now two examples from the new model
> The star of this one is the duck...
> http://www.obiwannabe.co.uk/sounds/effect-riverbirds.mp3
>
> And here's the seagulls (gotchya you feathered freaks!)
> http://www.obiwannabe.co.uk/sounds/effect-seabirds.mp3
>
> The same model can do both, so it's quite flexible. All (pure) Puredata
> The Pd
> code is still a little messy to release but it will be on the site soon or
> in
> the book maybe.
>
> Andy
>
> --
> Use the source
>
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