Distortion reduction of length-limited sound beam generated by parametric acoustic array

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS Applied Acoustics Pub Date : 2024-11-29 DOI:10.1016/j.apacoust.2024.110425

Hideyuki Nomura, Toi Nakagawa

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Abstract

Length-limited sound beams (LLSBs) generated by amplitude- and phase-controlled parametric acoustic arrays with different carrier frequencies (DCFs) are low-frequency directional sound beams with controlled lengths that transmit acoustic information in a specific direction near the sound source. However, a conventional LLSB produces significant distortion, which is caused by intermodulation of multiple primary and secondary waves. This study aims to reduce the distortion of LLSBs by using a pair of parametric arrays with the same carrier frequency (SCF). To verify the effectiveness of an SCF-type emitter, the beam profiles and distortion of the demodulated sound of SCF-type LLSBs were investigated theoretically and experimentally. The results show that adopting the SCF produced LLSBs without a significant sound pressure reduction near the sound source, similar to DCF-type LLSBs. Furthermore, compared to the distortion of the demodulated parametric signal for the DCF-type LLSB, that for the SCF-type LLSB was reduced by several tens of decibels. These results suggest that SCF-type LLSBs effectively present acoustic information with low distortion to the local area.

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参数声阵产生的限长声束畸变抑制

由不同载波频率的参数声阵列控制振幅和相位产生的限长声束（LLSBs）是一种长度可控的低频定向声束，在声源附近沿特定方向传播声信息。然而，传统的LLSB会产生明显的失真，这是由多个主波和次波的互调引起的。本研究旨在利用具有相同载波频率（SCF）的一对参数阵列来降低LLSBs的失真。为了验证scf型发射体的有效性，从理论上和实验上研究了scf型LLSBs解调声的波束分布和畸变。结果表明，采用SCF产生的LLSBs在声源附近没有明显的声压降低，与dcf型LLSBs相似。此外，与dcf型LLSB解调参数信号的失真相比，scf型LLSB解调参数信号的失真降低了几十分贝。这些结果表明，scf型LLSBs可以有效地向局部区域呈现低失真的声学信息。

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来源期刊

Applied Acoustics 物理-声学

CiteScore

7.40

自引率

11.80%

发文量

618

审稿时长

7.5 months

期刊介绍： Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense. Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems. Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.