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<!DOCTYPE HTML>
<html lang="en-GB">
<head>
<title>Towards A Virtual-Acoustic String Instrument | Sandor Mehes</title>
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<h1 id="logo"><a href="index.html#one">Sandor Mehes</a></h1>
<p>Ph.D. student, audio enthusiast<br /> and vinyl junkie</p>
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<h3>Towards A Virtual-Acoustic String Instrument</h3>
<h5>Sandor Mehes, Maarten van Walstijn and Paul Stapleton</h5>
<p>This paper was originally presented at <a href="https://smc2016.hfmt-hamburg.de"
target="_blank" rel="noopener">SMC16 Hamburg, Germany</a></p>
</header>
<section>
<h4>Abstract</h4>
<p>In acoustic instruments, the controller and the sound producing system often are one and the
same object. If virtual-acoustic instruments are to be designed to not only simulate the
vibrational behaviour of a real-world counterpart but also to inherit much of its interface
dynamics, it would make sense that the physical form of the controller is similar to that of
the emulated instrument. The specific physical model configuration discussed here reconnects
a (silent) string controller with a modal synthesis string resonator across the
real and virtual domains by direct routing of excitation signals and model parameters. The
excitation signals are estimated in their original force-like form via careful calibration
of the sensor, making use of adaptive filtering techniques to design an appropriate inverse
filter. In addition, the excitation position is estimated from sensors mounted under the
legs of the bridges on either end of the prototype string controller. The proposed
methodology is explained and exemplified with preliminary results obtained with a number of
off-line experiments.</p>
<hr />
<h4>Video</h4>
<p>The videos below give an impression of how the newest version of the instrument works across
a range of the physical parameter settings.</p>
<div class="video-container">
<iframe width="560" height="315"
src="https://www.youtube.com/embed/videoseries?list=PLWlSU2W7Ya39e4Y-_f2NMWX4aCoq7dEXq"
frameborder="0" allowfullscreen></iframe>
</div>
<hr />
<h4>Investigative Sound Examples</h4>
<p>Below a range of sound examples exemplifying the role of the estimation of the excitation
force.</p>
<div class="mediatec-cleanaudioplayer">
<ul data-theme="light" data-disable-controls="false" data-autoplay="false"
data-playlist-height="500px">
<li data-title="String plucked with plastic plectrum (piezo disk signal)"
data-type="wav" data-url="publications/smc16/audio/investigate/pdPluck1.wav"
data-free="false"></li>
<li data-title="String plucked with plastic plectrum (estimated force signal)"
data-type="wav" data-url="publications/smc16/audio/investigate/estPluck1.wav"
data-free="false"></li>
<li data-title="Piezo voltage signal sent through modal synthesis engine (piezo)"
data-type="wav" data-url="publications/smc16/audio/investigate/pdPluckString1.wav"
data-free="false"></li>
<li data-title="Estimated force signal sent through modal synthesis engine (estimated)"
data-type="wav" data-url="publications/smc16/audio/investigate/estPluckString1.wav"
data-free="false"></li>
<li data-title="String scratched with violin bow (piezo disk signal)"
data-type="wav" data-url="publications/smc16/audio/investigate/pdBow2.wav"
data-free="false"></li>
<li data-title="String scratched with violin bow (estimated force signal)"
data-type="wav" data-url="publications/smc16/audio/investigate/estBow2.wav"
data-free="false"></li>
<li data-title="Piezo voltage signal sent through modal synthesis engine (piezo)"
data-type="wav" data-url="publications/smc16/audio/investigate/pdBowString2.wav"
data-free="false"></li>
<li data-title="Estimated force signal sent through modal synthesis engine (estimated)"
data-type="wav" data-url="publications/smc16/audio/investigate/estBowString2.wav"
data-free="false"></li>
<li data-title="String hammered with metal stick (piezo disk signal)"
data-type="wav" data-url="publications/smc16/audio/investigate/pdHam1_clean.wav"
data-free="false"></li>
<li data-title="String hammered with metal stick (estimated force signal)"
data-type="wav" data-url="publications/smc16/audio/investigate/estHam1_clean.wav"
data-free="false"></li>
<li data-title="Piezo voltage signal sent through modal synthesis engine (piezo)"
data-type="wav"
data-url="publications/smc16/audio/investigate/pdHamString1_clean.wav"
data-free="false"></li>
<li data-title="Estimated force signal sent through modal synthesis engine (estimated)"
data-type="wav"
data-url="publications/smc16/audio/investigate/estHamString1_clean.wav"
data-free="false"></li>
</ul>
</div>
<hr />
<h4>Experimental Sound Examples</h4>
<p>A few sound examples with extreme parameter setup to demonstrate the capabilities of physical
modelling.</p>
<div class="mediatec-cleanaudioplayer">
<ul data-theme="light" data-disable-controls="false" data-autoplay="false"
data-playlist-height="300px">
<li data-title="Experimental sound example no. 1" data-type="wav"
data-url="publications/smc16/audio/extreme/exp3_scrape_bell.wav" data-free="false">
</li>
<li data-title="Experimental sound example no. 2" data-type="wav"
data-url="publications/smc16/audio/extreme/extreme14.wav" data-free="false"></li>
<li data-title="Experimental sound example no. 3" data-type="wav"
data-url="publications/smc16/audio/extreme/extreme8.wav" data-free="false"></li>
<li data-title="Experimental sound example no. 4" data-type="wav"
data-url="publications/smc16/audio/extreme/exp2_scrape_beam_long.wav"
data-free="false"></li>
</ul>
</div>
<hr />
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download="mehes_walstijn_stapleton_smc16.pdf"
class="button special small icon fa-download">Download the paper</a></li>
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