Time-Varying Spectral Modelling of the Solo Violin Tone
The analysis of the spectrum of a single viol in tone, to better understand how the various partial components contribute to the sound produced, is undertaken. The analysis involves determining which p m1ials are present and how these partials evolve with respect to time. The short-time Fourier t...
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Main Author: | |
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Format: | Thesis |
Language: | English English |
Published: |
2000
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Subjects: | |
Online Access: | http://psasir.upm.edu.my/id/eprint/8230/1/FEM_2000%208%20IR.pdf |
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Summary: | The analysis of the spectrum of a single viol in tone, to better understand how
the various partial components contribute to the sound produced, is undertaken. The
analysis involves determining which p m1ials are present and how these partials evolve
with respect to time. The short-time Fourier transform is used to implement a solution
for the time varying spectra by chopping the sound into short segments called windows
and analysing each segment sequentially. The MATLAB digital signal processing
software was used in both the analysis and resynthesis stages of this research.
Parameters extracted through analysis are used for resynthesis purposes. Results
indicate that spectrum changes over time contribute significantly to the timbre of the violin tone. A slight shifting of the fundamental frequency was also observed in the
sound spectrum of all the sub-sections of the waveform, although this shifting was most
marked in the attack and release portions of the ADSR envelope. The results also
showed that the intensity of the fundamental harmonic was weaker in the initial attack
stage, only dominating when the timbre of the tone stabilised. Within the release
portion, inharmonic overtones were shown to occur in the upper partials of the sound
spectrum. Finally, the resynthesis process reduces the required hard disk capacity by
about 93.8 percent compared with the sampled waveform, while at the same time
producing an audible tone almost indistinguishable from the original. |
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