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An experimental investigation about parameters' effects on spurious sound in parametric loudspeaker

机译：参数对参量扬声器中杂散声影响的实验研究

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摘要

The spurious sound in the measurement of the parametric loudspeaker is resultant from the nonlinearity at the receiving system caused by the ultrasonic waves with high amplitudes. It may provide a misleading result, especially in the nearfield, where the parametric array effect of the parametric loudspeaker cannot be easily observed. In this study, to eliminate or alleviate the effect of the spurious sound, an in-depth investigation into the spurious sound in the parametric loudspeaker is carried out experimentally by adopting an index of a ratio between the spurious sound and the demodulated difference-frequency sound. A relation between the above ratio and four main parameters, i.e., the amplitude of the primary waves at the source, the radius of the ultrasonic emitter array, the frequency value and the observation distance, is obtained. It exhibits a good match with the well-known theory described by the Gaussianbeam expansion technique. The threshold to ignore the spurious sound in the measurement of the parametric loudspeaker is also established. (C) 2018 Elsevier Ltd. All rights reserved.
机译：参数扬声器测量中的杂散声是由于高振幅超声波在接收系统上产生的非线性所致。它可能会产生误导性的结果，尤其是在近场中，在该情况下无法轻易观察到参数扬声器的参数阵列效果。在该研究中，为了消除或减轻杂散声的影响，通过采用杂散声与解调后的差频声音之间的比率的指标，通过实验对参数扬声器中的杂散声进行了深入研究。 。获得上述比率与四个主要参数之间的关系，即，在源处的初级波的振幅，超声发射器阵列的半径，频率值和观察距离。它与高斯光束扩展技术描述的众所周知的理论非常吻合。还建立了在参数扬声器测量中忽略杂散声音的阈值。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Applied Acoustics》 |2019年第5期|67-74|共8页
  • 作者

    Ji Peifeng; Yang Jun;

  • 作者单位

    Chinese Acad Sci, Inst Acoust, State Key Lab Acoust, Beijing 100190, Peoples R China|Chinese Acad Sci, Inst Acoust, Key Lab Noise & Vibrat Res, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Acoust, State Key Lab Acoust, Beijing 100190, Peoples R China|Chinese Acad Sci, Inst Acoust, Key Lab Noise & Vibrat Res, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Parametric loudspeaker; Spurious sound; Gaussian-beam expansion technique;

    机译：参数扬声器;杂散声;高斯光束扩展技术;

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