Mode tuning of a simplified string instrument using time-dimensionless state-derivative control

Benacchio, Simon; Chomette, Baptiste; Mamou-Mani, Adrien; Finel, Victor

doi:10.1016/j.jsv.2014.09.003

Cited by 6 publications

(6 citation statements)

References 12 publications

(15 reference statements)

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“…They use an active system with an electrodynamic actuator and a piezoelectric sensor in a closed loop, controlled by a timedimensionless algorithm, called modal active control. [19][20][21] Such combinations of musical instruments with sensors and actuators are called smart musical instruments. 20 By changing the modal parameters of a cello, the elimination of a wolf note is generally possible.…”

Section: Wolf Note Elimination Strategiesmentioning

confidence: 99%

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An active-system approach for eliminating the wolf note on a cello

Neubauer

Tschesche

Bös

et al. 2018

The Journal of the Acoustical Society of America

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Wolf notes are generally undesirable sounds that occur in string instruments, particularly in cellos. State-of-the-art passive wolf note eliminators affect the whole cello sound and can become ineffective when environmental conditions and, therefore, the cello's structural properties change. In this paper, an approach is presented that uses smart materials to eliminate the wolf note with little effects to the cello's sound. Based on preliminary measurements, a mathematical model of the cello for generating the wolf note and for developing a wolf note elimination controller is set up. The controller consists of a wolf detection criterion that triggers a velocity feedback controller to actively induce damping into the cello's body whenever a wolf note is detected. The controller setup is experimentally validated by an implementation on a test cello. The velocity feedback to induce the active damping is implemented by means of a piezoelectric patch actuator attached to the cello's body. Both the results of the mathematical model and the results of the experimental investigation show a good performance in eliminating the wolf note on a cello.

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Section: Wolf Note Elimination Strategiesmentioning

confidence: 99%

“…[19][20][21] Such combinations of musical instruments with sensors and actuators are called smart musical instruments. 20 By changing the modal parameters of a cello, the elimination of a wolf note is generally possible.…”

Section: Wolf Note Elimination Strategiesmentioning

confidence: 99%

An active-system approach for eliminating the wolf note on a cello

Neubauer

Tschesche

Bös

et al. 2018

The Journal of the Acoustical Society of America

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“…Benacchio et al [3,2] applied full state feedback control to the soundboard of a stringed instrument in order to modify the radiated sound.…”

Section: Active Feedback Controlmentioning

confidence: 99%

Traveling wave control of stringed musical instruments

Donovan

McPherson

2017

The Journal of the Acoustical Society of America

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I would like to thank my supervisor, Andrew McPherson, for giving me the chance to research such an interesting topic and for putting such a huge amount of e ort into this work over the years; my mum, Jenny Donovan, for a lifetime of inspiration and for keeping me on track the whole way through; everyone at the Augmented Instruments Laboratory and on the Bela team for providing such a stimulating working environment; everyone studying on or involved with the MAT program for some incredible experiences; and last but not least my flatmate Jay Pancholi for putting up with me writing this thing in his living room one long winter.

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“…Occluding the sound hole of the guitar partially mitigates the feedback problem by way of dampening the top plate, but this results in a significant alteration of the instrument's sound [15]. Recently, active control of the top plate's modes in real time has been proposed [16,17].…”

Section: Introductionmentioning

confidence: 99%

Feedback Control in an Actuated Acoustic Guitar using Frequency Shifting

Thuillier¹,

Lähdeoja²,

Välimäki³

2019

J. Audio Eng. Soc.

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Recent work has demonstrated that the classical guitar can be advantageously augmented using a pickup to drive an actuator mounted on the guitar's back plate, thereby allowing enrichment of the instrument's timbral palette with audio effect processors in the loop. The feedback problem that results from such setup is similar to that occurring in live music performance setups where the sound of a guitar is amplified using a loudspeaker. In the case at hand measurements of the augmented guitar's open loop response demonstrate that instabilities are susceptible to first occur from the string's modes and not from the guitar's soundbox. In particular, the shape of the magnitude response suggests frequency shifting as a viable solution to string instability. Introduction of an upwards frequency shift in the forward path is proposed as a means for stabilizing the closed loop system. Experimental results demonstrate that the proposed solution leads to improved stability even for a modest frequency shift of 3 Hz. The achieved gain margin improvement, which is shown to be of at least 3 dB, then comes at the cost of a clearly perceptible amplitude modulation, which may be acceptable in conjunction with other audio effects chosen by the performer.

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Mode tuning of a simplified string instrument using time-dimensionless state-derivative control

Cited by 6 publications

References 12 publications

An active-system approach for eliminating the wolf note on a cello

An active-system approach for eliminating the wolf note on a cello

Traveling wave control of stringed musical instruments

Feedback Control in an Actuated Acoustic Guitar using Frequency Shifting

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