| 耿丽,屈胜.电磁激励器屏幕发声系统的数理模型[J].,2019,38(6):969-979 |
| 电磁激励器屏幕发声系统的数理模型 |
| The mathematical-physical model of EMA screen sound system |
| 投稿时间：2019-01-10 修订日期：2019-10-30 |
| 中文摘要: |
| 目前，全面屏手机已经成为一种趋势，为提升全面屏的用户体验效果，业界开发了屏下指纹识别、伸缩式摄像头等技术，对于音频（主要是语音通话），则开发了基于压电陶瓷（PZT，Piezoelectric）和基于电磁激励器（EMA，Electro-Magnetic Actuator）的两种屏幕发声方案，其代表产品分别为小米MIX与VIVO NEX。该文针对EMA屏幕发声技术，分别从平板弯曲振动、平板声辐射、EMA阵列驱动等模型出发，推导EMA驱动屏幕振动发声的原理以及简化的力电类比等效线路图；给出仿真与实测频响曲线以及某型号手机语音通话测试数据；最后简要归纳EMA屏幕发声的设计指南以及进一步的研究方向。 |
| 英文摘要: |
| Full screen or full display mobile phone has become a trend. In order to improve user experience effect, the industry has developed some specific technologies, such as fingerprint recognition under screen, telescopic camera etc. For audio (mainly voice calls), two kinds of screen voice schemes based on PZT (piezoelectric) and EMA (Electro-Magnetic Actuator) have been developed. The representative products are MI MIX and VIVO NEX respectively. This paper, aiming at EMA screen sound technology, deduces the EMA screen sound principle and simplified mechanical-electrical analog equivalent circuit from flat-panel bending vibration, flat-panel sound radiation, EMA array-driven and other models. Then the application of FR（Frequency Response） simulation in EMA screen vocalization and the actual measurement data of a certain mobile phone are introduced. Finally, this paper concludes the design guidelines of the EMA screen sound and the further research direction. |
| DOI：10.11684/j.issn.1000-310X.2019.06.009 |
| 中文关键词: 电磁激励器、平板弯曲振动、平板声辐射、EMA驱动阵列 |
| 英文关键词: Electro-magnetic actuator, Flat-panel flexural vibration, Flat-panel sound radiation, EMA array-driven |
| 基金项目:无 |
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