Abstract
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.
Highlights
With the rapid development of consumer products such as mobile phones, notebook computers, and MP4 players, audio transducers have been recognized as multifunctional assets with which to increase the convenience of multimedia products
The three domains can be described with second-order differential equations that are modeled using a combination of resistance, capacity, and inductance; the equivalent-circuit method is used in the electromagnetic, mechanical, and acoustic domains [8]
The mechanical and acoustic domains are coupled by the diaphragm of driver and passive The mechanical and acoustic domains are coupled by the diaphragm of adriver and passive radiator
Summary
With the rapid development of consumer products such as mobile phones, notebook computers, and MP4 players, audio transducers have been recognized as multifunctional assets with which to increase the convenience of multimedia products. A closed speaker enclosure uses a vent structure or passive radiator to improve the low-frequency response. Based on the analysis tool, a screen is used to reduce the effect of the standing wave and improve the frequency response. The acoustic acoustic domain domain are uses the finite element method to consider the inner shape and structure of the enclosure. Uses the finite element method to consider the inner shape and structure of the enclosure. The sound pressure level enclosure with a passive radiator and screen sample is manufactured. The dip peak the frequency response response curve are canceled using a screen, and the SPL performance is improved.
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