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Re: Interesting case related to pitch perception

Dear Arturo:

I can say you that the position used to play C5 is not
the same used to play C6. C6 is as C5 plus a key for
the octave. 
Too, I would like know if this phenomen happens only
in C6 or it happens too with others notes, as B5, Bb5,
and A5.   



Emilio Renard.
Conservatorio Superior de Música "Joaquín Rodrigo" de
Valencia. Departamento de Composición.

--- Arturo Camacho <acamacho@xxxxxxxxxxxx> escribió:

> Dear members of the list,
> I am analyzing the spectrum of musical instruments
> in a pitch-related
> study and found something that puzzles me: the
> spectrum of an oboe playing
> the note G6 (approximately 1500 Hz pitch) contains
> peaks not only at
> multiples of 1500 Hz but also at each multiple of
> 500 Hz. This was
> observed in a sample taken from the University of
> Iowa Musical Instruments
> Database (http://theremin.music.uiowa.edu/MIS.html),
> specifically, the 8th
> note in the file "oboe.pp.C6Ab6.aiff". I do not know
> much about wind
> instruments, but my guess is that the position used
> to play G6 is probably
> the same used to play C5 and the only difference is
> the pressure in the
> mouth. This could leave the harmonics of C5 alive
> and that is why there is
> energy at multiples of 500 Hz. If someone know the
> reasons of this effect
> please let me see the light, because it would be
> nice to offer an
> explanation of this in my study.
> As an aside, this is an interesting example of a
> case in which the pitch
> is different from the fundamental. From the
> log-magnitude of the spectrum
> it is very clear that the signal consists of
> multiples of 500 Hz (although
> with boosted 3rd, 6th, 9th, etc. harmonics), and
> therefore, the
> fundamental frequency, if any, should be considered
> as 500 Hz and not 1500
> Hz.
> Arturo
> -- 
> __________________________________________________
> Arturo Camacho
> PhD Candidate
> Computer and Information Science and Engineering
> University of Florida
> E-mail: acamacho@xxxxxxxxxxxx
> Web page: www.cise.ufl.edu/~acamacho
> __________________________________________________

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