Subject: AW: [AUDITORY] question about overtones From: Sascha Fagel <sascha.fagel(at)TU-BERLIN.DE> Date: Thu, 17 Nov 2005 13:06:59 +0100Dear Tom, at least in speech and singing the sound characteristics of the primary source (glottis) is of importance. The output spectrum is a combination of the glottis spectrum and the vocal tract filter. The glottis produces something like a sawtooth f(t) = sin (t) + 1/2 sin (2t) + 1/3 sin (3t) + ... with a bit less high frequencies. The vocal tract has an overall relatively flat spectrum with again less high frequencies. But there are local maxima and minima due to the formants (as Gustavo has mentioned). You can find some details in Douglas O'Shaughnessy's "Speech Communications - Human and Mashine". Best regards Sascha ****************************************** Dr. Sascha Fagel Technical University Berlin Communication Science Secr. TEL10-1 Ernst-Reuter-Platz 7 10587 Berlin Fon +49(30)314-24527 Fax +49(30)314-79883 Email: sascha.fagel(at)tu-berlin.de http://fourier.kgw.tu-berlin.de/fagel.html ****************************************** -----Ursprungliche Nachricht----- Von: AUDITORY Research in Auditory Perception [mailto:AUDITORY(at)LISTS.MCGILL.CA]Im Auftrag von Luis Gustavo Martins Gesendet: Donnerstag, 17. November 2005 12:27 An: AUDITORY(at)LISTS.MCGILL.CA Betreff: Re: [AUDITORY] question about overtones Dear Tom, The relative amplitude of the overtones (i.e. harmonics) of a speech or a musical instrument sound is mainly defined by the resonant frequencies of the vocal tract (for the speech case) or by the musical instrument construction parameters (size, shape, materials, etc). This has an impact on the perceived timbre of a sound. These spectral resonances (also known as the peaks on the sound's spectral envelope) are known as formants, and they have an important influence on the timbre and "quality" of the sound (e.g. The first two formants of a speech signal have a big impact on the production of the different vowels, while higher order formats determine the register or the timbre quality of the voice). Hope it helps, Cheers, Gustavo --------------------------------------- Luis Gustavo Martins lmartins(at)inescporto.pt www.inescporto.pt/~lmartins INESC Porto Portugal www.inescporto.pt --------------------------------------- > -----Original Message----- > From: AUDITORY Research in Auditory Perception > [mailto:AUDITORY(at)LISTS.MCGILL.CA] On Behalf Of Tom Lee > Sent: quinta-feira, 17 de Novembro de 2005 0:59 > To: AUDITORY(at)LISTS.MCGILL.CA > Subject: [AUDITORY] question about overtones > > Dear list, > > Does anyone have information about the amplitude > relation between a tone and its overtones? What I mean > is, if I have some frequency and I want to generate > its natural overtone series, how loud do I make the > overtones in relation to the fundamental? Thanks in advance! > > -Tom > > Live by the foam sword; die by the foam sword! > http://www.yale.edu/freeduel > > Keep the jukebox swinging. > > > > > __________________________________ > Yahoo! Mail - PC Magazine Editors' Choice 2005 > http://mail.yahoo.com