On Tue, 11 Mar 2008 09:19:08 +0100 Bryan Jurish <[EMAIL PROTECTED]> wrote:
> moin Marius, moin list, > > sorry, haven't tried it yet -- i'm more interested in getting funny > noises out of pd than into it ;-) Maybe Andy Farnell has done something > along these lines? No, I've nothing much to offer here except that LPC (linear predictive coding) is one way I believe vowel recognition can be done. Perry and Eduardo Miranda both mention it in their textbooks in this context and I'm pretty sure there's a whole stack of papers out there from speech recognition people that will point you in this direction. LPC delivers the pitched or noisy component, plus a residual error, plus a profile of a filter that would reconstruct the orginal signal if the pitched/noisy part were subjected to it. I can't remember exactly how this works, but there is a way to turn the LPC analysis into the coefficients for this filter. In Csound it works as an analysis resynthesis pair. I think only three strong poles need to be identified then pattern matching to the spacing of these formants should give you the vowel, independently of the voice age/gender/louness etc when you look at the ratios (say the first and second distance vs the first and third) > > Speculating wildly (e.g. without any experience in vowel detection), I > think [fiddle~] probably won't work on its own: it's designed to detect > the fundamental frequency (f0), whereas vowels will differ primarily in > the formants: maybe an fft approach would work? or perhaps you could > have several instances of [fiddle~], tweaking the parameters such that > each detects a single formant? ... just wild speculation ... > > marmosets, > Bryan > > On 2008-03-11 00:35:42, marius schebella <[EMAIL PROTECTED]> > appears to have written: > > hi, > > I wonder if anyone did vowel recognition with Pd. Maybe ed kelly? or > > brian j.? > > can it be based on fiddle~ or does it neeed more/other objects/technology? > > marius. > > -- > Bryan Jurish "There is *always* one more bug." > [EMAIL PROTECTED] -Lubarsky's Law of Cybernetic Entomology > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list -- Use the source _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
