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Appl. Sci. 2018, 8(3), 436; doi:10.3390/app8030436

Constraint-Based Time-Scale Modification of Music Recordings for Noise Beautification

1
International Audio Laboratories Erlangen, 91058 Erlangen, Germany
2
Siemens Healthcare GmbH, 91052 Erlangen, Germany
*
Author to whom correspondence should be addressed.
Received: 9 February 2018 / Revised: 27 February 2018 / Accepted: 7 March 2018 / Published: 14 March 2018
(This article belongs to the Special Issue Digital Audio and Image Processing with Focus on Music Research)
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Abstract

In magnetic resonance imaging (MRI), a patient is exposed to beat-like knocking sounds, often interrupted by periods of silence, which are caused by pulsing currents of the MRI scanner. In order to increase the patient’s comfort, one strategy is to play back ambient music to induce positive emotions and to reduce stress during the MRI scanning process. To create an overall acceptable acoustic environment, one idea is to adapt the music to the locally periodic acoustic MRI noise. Motivated by this scenario, we consider in this paper the general problem of adapting a given music recording to fulfill certain temporal constraints. More concretely, the constraints are given by a reference time axis with specified time points (e.g., the time positions of the MRI scanner’s knocking sounds). Then, the goal is to temporally modify a suitable music recording such that its beat positions align with the specified time points. As one technical contribution, we model this alignment task as an optimization problem with the objective to fulfill the constraints while avoiding strong local distortions in the music. Furthermore, we introduce an efficient algorithm based on dynamic programming for solving this task. Based on the computed alignment, we use existing time-scale modification procedures for locally adapting the music recording. To illustrate the outcome of our procedure, we discuss representative synthetic and real-world examples, which can be accessed via an interactive website. In particular, these examples indicate the potential of automated methods for noise beautification within the MRI application scenario. View Full-Text
Keywords: music processing; audio; time-scale modification; alignment; beat tracking; magnetic resonance imaging; MRI music processing; audio; time-scale modification; alignment; beat tracking; magnetic resonance imaging; MRI
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Müller, M.; Hedwig, H.; Zalkow, F.; Popescu, S. Constraint-Based Time-Scale Modification of Music Recordings for Noise Beautification. Appl. Sci. 2018, 8, 436.

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