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Simultaneous imaging of sound propagations and spatial distribution of acoustic frequencies

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Abstract

We propose a simultaneous imaging technique of both sound propagations and spatial distribution of acoustic frequencies. We experimentally demonstrated the proposed technique for the acoustic waves of frequencies 39,500 and 40,500 Hz, which have close sound pressure. The sounds were recorded at the framerate of 100,000 fps by parallel phase-shifting digital holography. To obtain the distribution of the acoustic frequencies, the short-time Fourier transform analysis was applied. The simultaneous imaging was carried out by assigning the frequencies and the pixel values of the phase-difference images to the components of HSL color space. The images obtained by the proposed technique represent the frequencies with the hue in addition to the sound propagations with the luminance. We succeeded in imaging the spatiotemporal evolution of the spatial frequencies of the sounds.

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Supplementary Material (2)

NameDescription
Visualization 1       High-speed video of phase-difference image of the propagations of 39,500 Hz sound and 40,500 Hz sound radiated from two speakers. The value represented by the gray scale corresponds to that of the images shown in Fig. 11.
Visualization 2       High-speed video of propagations of 39,500 Hz sound and 40,500 Hz sound radiated from two speaker obtained from the proposed simultaneous imaging technique. The value represented by the hue scale corresponds to that of the images shown in Fig. 12.

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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