hi all, I don't think anyone knows the answer to this. Traditionally, ever since Schroeder's reverberator, I think people have used delay times within a ratio of 1.5:1 of each other so that any old mean works OK.
cheers Miller On Fri, Aug 29, 2008 at 10:07:30PM +0100, Claude Heiland-Allen wrote: > Hi all, > > Referring to Miller's book [1], and having experimented with various > delay times, I'm wondering what the "average" delay time used in the > text is. If all the delay times are close to equal, then using the > arithmetic mean as "average" gives me a reasonably accurate > reverberation time calculation. But the more they differ the worse the > result is (comparing with measurement against my implementation). > > [1] http://crca.ucsd.edu/~msp/techniques/latest/book-html/node111.html > > Intuitively it seems that the sound recirculates more often (and is thus > attenuated more) through the shorter delay lines, but this is obviously > not taken into account with arithmetic mean. I'm thinking something > like harmonic mean might be better (but I tried it and it wasn't a huge > improvement, nor was geometric mean). > > Any clarification would be enlightening, thanks, > > > Claude > -- > http://claudiusmaximus.goto10.org > > _______________________________________________ > Pd-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list _______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list