Subject: Re: Auditory wheel From: Marcelo Freitas Caetano <gaiolouvo-auditory@xxxxxxxx> Date: Wed, 24 Mar 2010 07:31:42 -0700 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>Hello Michael and list, thank you Malcolm for your relevant comments on Hiroko's inspired work. I'd just like to point out that my latest results on sound morphing don't seem to confirm that cepstral coefficients are the best representation of a 'linear' perceptual space for sound morphing with respect to the spectral shape (as measured by perceptual spectral shape descriptors, further details on http://recherche.ircam.fr/anasyn/caetano/icmc2010.html. Click on the title to read the article). This work is part of my PhD thesis being developed at Ircam and these results are fresh from the oven. The article is yet to appear on the proceedings of this year's ICMC, but I'm already looking forward to discussing them with anyone who might be interested. Regards, Marcelo Caetano --- Em sex, 19/3/10, Hiroko Terasawa <hiroko@xxxxxxxx> escreveu: > De: Hiroko Terasawa <hiroko@xxxxxxxx> > Assunto: Re: [AUDITORY] Auditory wheel > Para: AUDITORY@xxxxxxxx > Data: Sexta-feira, 19 de Março de 2010, 3:20 > Hello Michael and the list, > > Thanks Malcolm for pointing out our work! > > I recently submitted my PhD thesis which discusses the > perception of > the sound color (i.e. spectral energy) and the density > (i.e. > fine-scale temporal variation of sound pressure) with > their > quantitative representations. Either or both of these > qualities can > constitute a seamlessly morphing timbre space. > > I wish I have had my thesis online but Stanford is > still preparing > the electronic dissertation database > (http://news.stanford.edu/news/2010/january18/electronic-dissertation-folo-012010.html). > I will let the list know once it is officially uploaded. > For now, I > can send you my thesis file so please let me know if > you're > interested. > > - hiroko > > ----- > Hiroko Terasawa > http://www.tara.tsukuba.ac.jp/~terasawa/ > ** Hiroko moved to TARA Center, University of Tsukuba! > > > > On Fri, Mar 19, 2010 at 10:48 AM, Malcolm Slaney <malcolm@xxxxxxxx> > wrote: > > On Mar 18, 2010, at 5:22 PM, Michael H. Coen wrote: > > > >> I'm looking for the auditory equivalent of a color > wheel. Namely, a > >> parametrized, continuous method for generating a > series of sounds that > >> form a "perceptual loop" that has no perceived > gaps. > > > > > > Hiroko Terasawa did some work on this problem a few > years ago. > > > > The color wheel works because it shows all colors in a > perceptually relevant > > space. It's just a three-dimensional (or four if you > are blessed) space and > > you can easily move between points in straight lines. > It's a complete > > model. > > > > There is no equivalent in the auditory space, yet. > > > > The first two dimensions of an auditory space appear > to be pitch and > > loudness, and then something related to timbre. > Terasawa showed that > > low-dimensional cepstral coefficients are a good > representation for static > > timbre sounds. With such a representation one could > smoothly move from one > > sound to another in timbre space. The papers are > online at > > https://ccrma.stanford.edu/~hiroko/timbre/index.htm > > Unlike previous work on timbre spaces, she started > with a sound synthesis > > procedure and then measured how parsimonious the > sounds were with respect to > > a linear perceptual space. That space might be close > to your desired wheel. > > > > Let me know if you have questions. > > > > - Malcolm > > > ____________________________________________________________________________________ Veja quais são os assuntos do momento no Yahoo! +Buscados http://br.maisbuscados.yahoo.com