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Enhancing low frequency sound transmission measurements using a synthesis method
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10.1121/1.2754062
/content/asa/journal/jasa/122/2/10.1121/1.2754062
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/2/10.1121/1.2754062
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Geometric arrangement of the source and receiving room connected through a test partition for sound transmission loss measurement.

Image of FIG. 2.
FIG. 2.

Kinetic energy of the test panel: measured (bold) and predicted with two boundary conditions (clamped: dotted; simply supported: thin).

Image of FIG. 3.
FIG. 3.

Potential energy of the source room: measured (bold) and predicted (thin).

Image of FIG. 4.
FIG. 4.

(Color online) Photograph of the acoustic source and the test partition for the classical methodology.

Image of FIG. 5.
FIG. 5.

(Color online) Photograph of the near-field array of loudspeakers for the synthesis of an acoustic diffuse field on the source room side of the test partition for the new methodology.

Image of FIG. 6.
FIG. 6.

Prediction of the sound reduction index in third-octave bands for the test partition mounted in an infinite baffle under diffuse field excitation conditions (thin), and in the source room-panel configuration obtained with the near-field optimized loudspeakers (dotted) and with a far-field acoustic source such as in the classical methodology (bold).

Image of FIG. 7.
FIG. 7.

Condition number associated with the plant response matrix measured between a near-field array of loudspeakers and a grid of microphones covering the surface of a test panel and located in a reverberant (bold) or in a semianechoic (thin) acoustic environment.

Image of FIG. 8.
FIG. 8.

Spatial correlation function along the panel length when perfect reproduction of an acoustic diffuse field at the microphones’ positions is assumed (bold), that achieved in a reverberant room when using either a near-field array of optimized loudspeakers (thin) or an omnidirectional sound source (dotted).

Image of FIG. 9.
FIG. 9.

Third-octave averaged spatial correlation function along the panel length when perfect reproduction of an acoustic diffuse field at the microphones’ positions is assumed (bold), that achieved in a reverberant room when using either a near-field array of optimized loudspeakers (thin) or an omnidirectional sound source (dotted).

Image of FIG. 10.
FIG. 10.

Experimental setup for the laboratory synthesis of a diffuse sound pressure field.

Image of FIG. 11.
FIG. 11.

(Color online) Photograph of the arbitrary waveform generator system.

Image of FIG. 12.
FIG. 12.

Normalized amplitudes of the spatial correlation structures obtained at (left column) and (right column) when perfect reproduction of an acoustic diffuse field at microphones positions is assumed (top row), that estimated from the optimal time-domain signals at the microphones outputs due to the near-field optimized sources (middle row) and that estimated from the time-domain signals due to the omnidirectional source (bottom row).

Image of FIG. 13.
FIG. 13.

Sound reduction index in one-third-octave bands for the test partition in an infinite baffle under diffuse field excitation conditions (thin), and measured in the source room-panel configuration from experimental synthesis of a diffuse pressure field (dotted) and using the classical approach (bold).

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/content/asa/journal/jasa/122/2/10.1121/1.2754062
2007-08-01
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhancing low frequency sound transmission measurements using a synthesis method
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/2/10.1121/1.2754062
10.1121/1.2754062
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