Subject: Re: Auditory wheel From: Hiroko Terasawa <hiroko@xxxxxxxx> Date: Fri, 19 Mar 2010 11:20:12 +0900 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>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 >