On Tuesday 28 January 2003 15.06, Steve Harris wrote: > On Tue, Jan 28, 2003 at 09:49:23 +0100, David Olofson wrote: > > Thoughts? Any ideas for useful cross feedback configurations? > > One of the waveguide papers gives the maths to use for stable > feedback matrix values, its pretty obvious from what I remember, > just make |A| = 1.0. Adding an allpass at the junctions will make > it sound smoother. > > I have a perl script that can create arbitrary matrixes + filters + > delay lines from a description of the surface network, which is how > I built the gong and plate reverb models. Interesting surface > shapes (eg. bow tie) can produce interesting (and quite > predictable) sonic results.
Sounds interesting, but... > You have to be careful because some of this stuff is covered by the > Karplus/Stanford/Yamaha patents. IIRC non commercial use is > allowed. Damn. That means I can't have a reverb in an LGPLed engine, or are there other, useful ways of doing it? I mean, how would one go about *not* doing it with feedback delay lines in roughly one of the configurations covered by the patents...? Reinventing this without having seen these designs hardly helped, as I ended up with the same design anyway. This reminds all too much of this direct-from-disk sampler thing... //David Olofson - Programmer, Composer, Open Source Advocate .- The Return of Audiality! --------------------------------. | Free/Open Source Audio Engine for use in Games or Studio. | | RT and off-line synth. Scripting. Sample accurate timing. | `---------------------------> http://olofson.net/audiality -' --- http://olofson.net --- http://www.reologica.se ---
