Performance Of Microspeaker Research Articles

An optimal design of the internal space in a micro-speaker module

The development of display and battery technologies has led to the miniaturization of smart devices. However, the acoustic performance of micro speakers using less than 1–2 cm3 of space has been limited. Internal space management for modules with limited internal volumes is a critical factor in the acoustic performance of mobile devices. Previous studies have mostly focused on improving the performance of a micro speaker itself. This study has sought to identify the characteristics of resonant space by performing an anechoic chamber experiment using the Taguchi method and by using the finite element analysis of a micro-speaker module. As a result, an optimum internal space was designed based on the effects of the structural characteristics of the interior of the microspeaker module on the acoustic performance. In particular, focus was placed on the rise in sound pressure at low frequencies and on the flatness of the sound pressure at high frequencies related to the size and shape of the internal space.

Optimization of SPL and THD Performance of Microspeakers Considering Coupling Effects

Mobile phones have become more versatile as a result of advances in mobile communication technology. The latest mobile phones are able to provide dazzling multimedia entertainment with portability. A microspeaker has become a generic electromechanical part of mobile phones that enables multimedia features. Therefore, the performance of the microspeaker must be improved in line with the increasing demand for high-quality sound produced by the phone. Sound pressure level (SPL) and total harmonic distortion (THD) are the two most common evaluation criteria that are used to quantify the performance of the microspeaker. Therefore, it is necessary to implement an analysis procedure that predicts and quantifies the SPL and THD characteristics. This manuscript suggests a multiphysics analysis procedure that comprehensively considers electromagnetic, mechanical, and acoustic coupling effects. The experimental results confirm the validity of the proposed analysis procedure.