Andy, thanks for these things. Your stuff is always very enlightening! Mike
On Wed, Feb 20, 2008 at 11:23 PM, Andy Farnell <[EMAIL PROTECTED]> 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 > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > -- Peace may sound simple—one beautiful word— but it requires everything we have, every quality, every strength, every dream, every high ideal. —Yehudi Menuhin (1916–1999), musician
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