1,679 research outputs found
How do clarinet players adjust the resonances of their vocal tracts for different playing effects
In a simple model, the reed of the clarinet is mechanically loaded by the
series combination of the acoustical impedances of the instrument itself and of
the player's vocal tract. Here we measure the complex impedance spectrum of
players' tracts using an impedance head adapted to fit inside a clarinet
mouthpiece. A direct current shunt with high acoustical resistance allows
players to blow normally, so the players can simulate the tract condition under
playing conditions. The reproducibility of the results suggest that the
players' "muscle memory" is reliable for this task. Most players use a single,
highly stable vocal tract configuration over most of the playing range, except
for the altissimo register. However, this 'normal' configuration varies
substantially among musicians. All musicians change the configuration, often
drastically for "special effects'' such as glissandi and slurs: the tongue is
lowered and the impedance magnitude reduced when the player intends to lower
the pitch or to slur downwards, and vice versa
Effect of Changing the Vocal Tract Shape on the Sound Production of the Recorder: An Experimental and Theoretical Study
Changing the vocal tract shape is one of the techniques which can be used by
the players of wind instruments to modify the quality of the sound. It has been
intensely studied in the case of reed instruments but has received only little
attention in the case of air-jet instruments. This paper presents a first study
focused on changes in the vocal tract shape in recorder playing techniques.
Measurements carried out with recorder players allow to identify techniques
involving changes of the mouth shape as well as consequences on the sound. A
second experiment performed in laboratory mimics the coupling with the vocal
tract on an artificial mouth. The phase of the transfer function between the
instrument and the mouth of the player is identified to be the relevant
parameter of the coupling. It is shown to have consequences on the spectral
content in terms of energy distribution among the even and odd harmonics, as
well as on the stability of the first two oscillating regimes. The results
gathered from the two experiments allow to develop a simplified model of sound
production including the effect of changing the vocal tract shape. It is based
on the modification of the jet instabilities due to the pulsating emerging jet.
Two kinds of instabilities, symmetric and anti-symmetric, with respect to the
stream axis, are controlled by the coupling with the vocal tract and the
acoustic oscillation within the pipe, respectively. The symmetry properties of
the flow are mapped on the temporal formulation of the source term, predicting
a change in the even / odd harmonics energy distribution. The predictions are
in qualitative agreement with the experimental observations
Acoustical Measurement of the Human Vocal Tract: Quantifying Speech & Throat-Singing
The field of biological acoustics has witnessed a steady increase in the research into overtone singing, or âthroat-singing,â in which a singer utilizes resonance throughout the vocal tract to sing melodies with the overtones created by a vocal drone. Recent research has explored both how a singer vocalizes in order to obtain rich harmonics from a vocal drone, as well as how further manipulations of the vocal apparatus function to filter and amplify selected harmonics. In the field of phonetics, vowel production is quantified by measuring the frequencies of vocal tract resonances, or formants, which a speaker manipulates to voice a particular vowel. Thus, an investigation of throat singing is closely linked to human speech production. Formants are usually detected in vowel spectra obtained using Fast Fourier Transform algorithms (FFTs). An alternative method that provides much higher frequency resolution is external excitation of the vocal tract and measurement of the pressure response signal at the mouthâs opening, which can be used to calculate the acoustic impedance spectrum. We demonstrate the use of such an âacoustic impedance meterâ to measure the formant frequencies of common vowels as well as the oscillatory modes of simple resonant pipe systems. The impedance meter accurately measures fundamental pipe modes and a variety of formant frequencies with an uncertainty of 1 Hz. Finally, we assess how the impedance meter may be used to measure the unique resonances achieved by qualified throat singers
Inverse scattering for vowel articulation with frequency-domain data
An inverse scattering problem is analyzed for vowel articulation in the human
vocal tract. When a unit amplitude, monochromatic, sinusoidal volume velocity
is sent from the glottis towards the lips, various types of scattering data are
used to examine whether the cross sectional area of the vocal tract can
uniquely be determined by each data set. Among the data sets considered are the
absolute value of the pressure measured at a microphone placed at some distance
from the lips, the pressure at the lips, and the transfer function from the
glottis to the lips. In case of nonuniqueness, it is indicated what additional
information may be used for the unique determination.Comment: 29 pages, 9 figure
Relations entre pression, débit, mouvement ds lÚvres, et impédances amont et aval pour le trombone
International audienceThis experimental study investigates ten subjects playing the trombone in the lower and mid-high range of the instrument, B[2 to F4. Several techniques are combined to show the pressures and the impedance spectra upstream and downstream of the lips, the acoustic and total flows into the instrument , the component of the acoustic flow due to the sweeping motion of the lips, and high speed video images of the lip motion and aperture. The waveforms confirm that the inertance of the air in the channel between the lips is usually negligible. For lower notes, the flow caused by the sweeping motion of the lips contributes substantially to the total flow into the mouthpiece. The phase relations among the waveforms are qualitatively similar across the range studied, with no discontinuous behavior. The players normally played at frequencies about 1.1% above that of the impedance peak of the bore, but could play below as well as above this frequency and bend from above to below without discontinuity. The observed lip motion is consistent with two-degree-of-freedom models having varying effective lengths. These provide insight into why lips can auto-oscillate with an inertive or compliant load, or without a downstream resonator
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