Energetic properties of acoustic fields

Schiffrer, G.; Stanzial, Domenico

doi:10.1121/1.410585

Cited by 22 publications

(21 citation statements)

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“…A series of articles later introduce an alternative definition for instantaneous intensity in a general nonmonochromatic sound field [8][9][10] . In particular, Stanzial and Prodi 10 called these new parameters the radiating and oscillating intensities, which provide an alternative to the more usual active and reactive instantaneous intensity terminology.…”

Section: Introductionmentioning

confidence: 99%

Measurement of complex acoustic intensity in an acoustic waveguide

Duan

Kirby²,

Prisutova³

et al. 2013

The Journal of the Acoustical Society of America

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Acoustic intensity is normally treated as a real quantity, but in recent years many articles have appeared in which intensity is treated as a complex quantity where the real (active) part is related to local mean energy flow, and the imaginary (reactive) part to local oscillatory transport of energy. This offers the potential to recover additional information about a sound field and then to relate this to the properties of the sound source and the environment that surrounds it. However, this approach is applicable only to a multi-modal sound fields, which places significant demands on the accuracy of the intensity measurements. Accordingly, this article investigates the accuracy of complex intensity measurements obtained using a tri-axial Microflown intensity probe by comparing measurement and prediction for sound propagation in an open flanged pipe. Under plane wave conditions comparison between prediction and experiment reveals good agreement, but when a higher order mode is present the reactive intensity field becomes complicated and agreement is less successful. It is concluded that the potential application of complex intensity as a diagnostic tool is limited by difficulties in measuring reactive intensity in complex sound fields when using current state of the art acoustic instrumentation.3

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Section: Introductionmentioning

confidence: 99%

Measurement of complex acoustic intensity in an acoustic waveguide

Duan

Kirby²,

Prisutova³

et al. 2013

The Journal of the Acoustical Society of America

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“…represents the reactive intensity, i.e., the locally oscillating, non-propagating part of the sound field [21], [29], [32]. In [33], this imaginary part is related to the level of phasiness [3], a subjective defect of multi-loudspeaker reproduction methods which is associated with listening discomfort and image instability in case of head movements [34].…”

Section: Modeling the Desired Diffuse Sound Eventmentioning

confidence: 99%

Optimization-based reproduction of diffuse audio objects

Franck

Fazi

Melchior³

2015

2015 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA)

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The creation of a diffuse sound event from a single audio signal is an important signal processing task, for instance in spatial audio reproduction or audio coding. Current algorithms based on decorrelation filters or frequency-dependent panning typically cause artifacts due to transients or time-domain aliasing. In this paper, we propose an optimizationbased approach to diffusion that creates a set of filters to approximate a desired distribution of frequency-dependent propagation directions to create the perception of a diffuse sound field with a multi-channel audio system. Thus, the diffusion can be optimally adapted to a specific reproduction scenario. In addition, the transient response can be purposefully improved by imposing constraints on the time-domain filter coefficients.

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“…Another useful indicator introduced and indicated by in reference [2] on the basis of the velocity of energy transferred by the active intensity de"ned in reference [1] has the expression…”

Section: New Energetic Field Indicators: the Energy Partition And Thementioning

confidence: 99%

“…A new theoretical approach to the energetic analysis of general sound "elds has been developed and validated in recent years [1]. Following this approach, which rigorously accounts for the wave nature of the sound "eld, a physically meaningful bipartition of the instantaneous sound intensity has been introduced [2] and the two de"ned quantities have been interpreted as the radiating and oscillating components of the sound intensity [3].…”

Section: Introductionmentioning

confidence: 99%