| 曾宪宏,冯雪磊,沈勇.微型扬声器总谐波失真测量的衍射效应*[J].,2024,43(5):941-948 |
| 微型扬声器总谐波失真测量的衍射效应* |
| Diffraction effects on the measurement of total harmonic distortion of microspeakers |
| 投稿时间：2023-05-18 修订日期：2024-09-06 |
| 中文摘要: |
| 该文旨在消除衍射效应对微型扬声器总谐波失真测量的影响，根据扩展的Biot–Tolstoy–Medwin模型，研究了微型扬声器总谐波失真测量的衍射效应，重点分析了微型扬声器后腔封闭和后腔开放的两种不同条件下考虑微型扬声器后向衍射和不考虑后向衍射的两种情况。该文使用的是简单稳定的障板测试条件，由于衍射效应与障板尺寸和微型扬声器的安装位置有关，因此该文将微型扬声器安装在固定尺寸的障板上的固定位置。该文理论计算了不同测量距离下障板的衍射曲线，分析了对应情况下微型扬声器总谐波失真测量的衍射效应，并进行实验验证。实验结果与理论计算吻合良好，证明了该文计算方法的准确性。该文研究表明，微型扬声器总谐波失真测量的衍射效应受障板的影响较大，且测试距离越远，影响越大，扬声器后腔开放时的衍射效应比后腔封闭时的衍射效应更为明显。使用根据该文的方法计算出的衍射曲线，可以对微型扬声器测量得到的总谐波失真进行修正，消除障板测试条件下衍射效应的影响。 |
| 英文摘要: |
| This paper aims to eliminate the effects of diffraction on the measurement of total harmonic distortion (THD) of microspeakers and studies the diffraction effects on the measurement of THD of microspeakers based on the extended Biot-Tolstoy-Medwin model, two different cases with and without the consideration of the backward diffractions were investigated, which correspond to different practical conditions of microspeaker drivers and closed-box microspeaker modules. This article uses barrier to test due to its simplicity and stabilization. Because diffraction is related to the size of baffle and the installation position of microspeakers, this article installs microspeaker in a fixed position on a fixed size baffle. This article theoretically calculates the diffraction curves of baffle at different measuring distances, analyzes the impact of diffraction on the THD of microspeakers under corresponding conditions, and conducts experimental verification. The experimental results are in good agreement with theoretical calculations, demonstrating the accuracy of the calculation method in this paper. This study shows that the diffraction effects on the measurement of THD of microspeakers is greatly affected by baffle. The farther the test distance, the greater the impact. The diffraction effect is more obvious when the rear cavity of the microspeaker is open than closed. By using the method presented in this article to calculate the diffraction curve, the THD of microspeakers measured on baffle can be corrected to eliminate the effects of diffraction. |
| DOI：10.11684/j.issn.1000-310X.2024.05.002 |
| 中文关键词: 微型扬声器 衍射 总谐波失真 障板 |
| 英文关键词: Microspeaker Diffraction Total harmonic distortion Baffle |
| 基金项目:国家重点研发计划 |
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| 摘要点击次数: 178 |
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