Narrow-edged Acoustical Beamforming Utilizing Phase Inversion for Frequency Modulation-based Parametric Array Loudspeaker

Geng, Yuting; Nakayama, Masato; Nishiura, Takanobu

doi:10.1109/apsipaasc58517.2023.10317130

Cited by 1 publication

(1 citation statement)

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“…In spite of the poorer sound quality compared with conventional EDLs [28], PALs have been attracting attention because of their sharp directivity and unique audio applications [29][30][31][32]. In the practical use of PALs, the target audible signal is converted into ultrasound with amplitude modulation [25] or frequency modulation [33]. The modulated signal holds multiple frequency components and is emitted into the air intensely.…”

Section: Introductionmentioning

confidence: 99%

Visualization of Demodulated Sound Based on Sequential Acoustic Ray Tracing with Self-Demodulation in Parametric Array Loudspeakers

Geng,

Shimokata,

Nakayama

et al. 2024

Applied Sciences

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With the development of acoustic simulation methods in recent decades, it has become feasible to simulate the sound pressure distribution of loudspeakers before actually setting physical speakers and measuring the sound field. The parametric array loudspeaker (PAL) has attracted attention due to its sharp directivity and unique applications. However, the sound reproduced by PALs is generated by the nonlinear interactions of ultrasound in the air, which makes it difficult to simulate the reproduced sound of a PAL with low computational load. Focusing on the sharp directivity of ultrasound, we extended conventional acoustic ray-tracing methods to consider the self-demodulation phenomenon of PALs. In this study, we developed a visualization method for the demodulated sound of a PAL. Specifically, the demodulated sound pressure distribution can be simulated to estimate and visualize the area covered by the reproduced sound of PAL before setting a real PAL. In the proposed method, acoustic rays were generated sequentially to express the generation of demodulated sound. Therefore, the proposed method is expected to simulate the demodulated sound of a PAL with acceptable accuracy and low calculation complexity. Quantitative evaluation between simulation results and practical measurement has been carried out, and the results demonstrate the effectiveness of the proposed method.

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