> What is the history behind birds.clm (birds.scm) ?. Around 1980 I wanted a bird song for "Colony", but realistic-sounding bird songs are not easy to make from scratch. So I got out my bird book, Robbins, Bruun, Zim, Singer "Birds of North America" Golden Press, NY 1966, which had sonograms of most of the songs. The graphs were incredibly small, so I needed a magnifying glass to read them, but in many cases, you could simply copy the data into the frequency and amplitude envelopes of a sine wave instrument, and a pretty good bird song would result. My main collaborator in this research was the AI lab cat named Marathon. She would prowl around the speakers trying to find the birds, which I took as expert approval. bird.clm/scm is a very direct translation of those notelists.
Here's the Samson box version of the bird: Instrument(Bird); INTEGER ARRAY Gens[1:3]; REAL ARRAY Frats,ARats[1:3]; INTEGER i,AllOut,FltOut; Pars(<(Name,Beg,Dur,Frq,FrqSkw,Amp,Deg,Rev,FUNCTION FrqF,FUNCTION AmpF,LpCoeff)>); Waiter(Beg); Gens[1]Osc(Pns,AllOut,Zero,Sinemode); IF LpCoeff>0 AND LpCoeff<1 THEN FltSig(Pns,FltOut,AllOut,LpCoeff,1-LpCoeff,0,1) ELSE FltOutAllOut; LocSig(Pns,FltOut,Deg,1,Rev); AddEnv(Pns,Gens[1],"F",Frq,FrqSkw,FrqF); AddEnv(Pns,Gens[1],"A",0,Amp,AmpF); End_Instrument(Pns); The funny characters are left-arrows in the SAIL character set. The low-pass filter was for distance effects. Many years later, I made what I think are better renditions in animals.scm, using Snd to make the sonograms, and some very good recordings from Cornell. There's documentation about that in sndscm.html. Some bird songs are incredibly beautiful when slowed down via granular synthesis. _______________________________________________ Cmdist mailing list [email protected] http://ccrma-mail.stanford.edu/mailman/listinfo/cmdist
