Analysis and Design of Helmholtz Protector to Improve High-Frequency Response of Insert Earphone

With the development of multimedia devices, earphones are playing an increasingly important role. This article applies the lumped parameter method using an equivalent circuit to model the electromagnetic, mechanical, and acoustic domains of earphones. Then, parameters are determined according to the dimensions and material properties of earphone parts. On the basis of the analysis tool and determined parameters, a Helmholtz protector is analyzed and designed to improve the high-frequency response. Samples are fabricated, and the experiment verifies the analysis method. The experimental result shows that the peaks at 7 k and 10 k are decreased at 8.05 dB and 7.89 dB. The root means square value of SPL deviation compared with target curve decreased from 9.77 to 4.39. High-frequency response is improved by using the Helmholtz protector.

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Analysis and Application of Screens for Acoustic Impedance in a Speaker Box with a Passive Radiator to Decrease Standing-Wave Influence

Applied Sciences ◽

10.3390/app10030866 ◽

2020 ◽

Vol 10 (3) ◽

pp. 866

Author(s):

Yuan-Wu Jiang ◽

Dan-Ping Xu ◽

Zhi-Xiong Jiang ◽

Jun-Hyung Kim ◽

Ki-Hong Park ◽

...

Keyword(s):

Standing Wave ◽

Acoustic Resonance ◽

Experimental Result ◽

Parameter Method ◽

Analysis Tool ◽

Analysis Method ◽

The Finite Element Method ◽

Lumped Parameter ◽

Acoustic Domain ◽

Lumped Parameter Method

Micro speakers are playing an increasingly important role with the development of multimedia devices. This study applies the lumped-parameter method, which uses an equivalent circuit to model the electromagnetic and mechanical domains. The acoustic domain is modeled using the finite element method. Based on the analysis tool, the use of a screen is analyzed, and the screen is designed to depress the acoustic resonance in the sound-pressure-level curve and improve the performance. The samples are fabricated, and the experiment verifies the analysis method. The experimental result shows that the peak and dip due to the standing wave are cancelled, and the frequency response is smooth when the screen is used.

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High frequency response sensitivity of electrically large enclosure with aperture and its statistical analysis method

2015 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC) ◽

10.1109/apemc.2015.7175405 ◽

2015 ◽

Author(s):

Zhao Yuan ◽

Zhao Xiang ◽

Yan Liping ◽

Zhou Haijing ◽

Huang Kama

Keyword(s):

Statistical Analysis ◽

Frequency Response ◽

High Frequency ◽

Analysis Method ◽

Response Sensitivity ◽

High Frequency Response ◽

Large Enclosure ◽

Statistical Analysis Method

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Comparison of Multi-Physical Coupling Analysis of a Balanced Armature Receiver between the Lumped Parameter Method and the Finite Element/Boundary Element Method

Applied Sciences ◽

10.3390/app9050839 ◽

2019 ◽

Vol 9 (5) ◽

pp. 839 ◽

Cited By ~ 3

Author(s):

Yuan-Wu Jiang ◽

Dan-Ping Xu ◽

Zhi-Xiong Jiang ◽

Jun-Hyung Kim ◽

Sang-Moon Hwang

Keyword(s):

Finite Element ◽

Boundary Element Method ◽

Boundary Element ◽

Material Property ◽

Parameter Method ◽

Analysis Method ◽

Lumped Parameter ◽

Lumped Parameter Method ◽

Element Boundary ◽

Element Method

The balanced armature receiver (BAR) is a product based on multiphysics that enables coupling between the electromagnetic, mechanical, and acoustic domains. The three domains were modeled using the lumped parameter method (LPM) that takes advantage of an equivalent circuit. In addition, the combined finite element method (FEM) and boundary element method (BEM) was also applied to analyze the BAR. Both simulation results were verified against experimental results. The proposed LPM can predict the sound pressure level (SPL) by making use of the BAR parts dimension and material property. In addition, the previous analysis method, FEM/BEM, took 36 h, while the proposed LPM takes 1 h. So the proposed LPM can be used to check the BAR parts’ dimension and material property influence on the SPL and develop the BAR product efficiently.

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