使用回音消除模組之超薄型行動無線免持聽筒機構之設計

Abstract

本論文最主要在研究探討使用回音消除模組之超薄型可攜式無線免持聽筒機構在回音消除方面的設計方式。經由本文相關的研究，對於聲學理論及回音等聲音量測有更佳的了解與掌握，而由上述研究結果知道，藉由成功與原失敗案例分析其不同的麥克風排列方式及效能測試紀錄，可以發現對於超薄型可攜式無線免持聽筒機構設計其主要麥克風聲壓值需小於參考麥克風聲壓值，而麥克風防振橡膠座對於麥克風收音效能具有最大的影響。上述實驗成果除可改善目前市面上相關無線免持聽筒機構的缺失外亦可運用在未來需要加入通訊功能的MP4等相關產業之裝置上。

The thesis’s main study is design of a echo canceller module integrated ultra-thin type mobile wireless hands-free kit structure. The purpose of this research is to achieve better understanding of the design of hands-free kit structure and grasp the acoustics characteristics and setting up a procedure for echo measurement. From this result, the placements of the microphones and its performances are then recorded, the differences of the performances are analyzed. It is found that for satisfactory design of a ultra-thin type mobile wireless hands-free kit structure, the main microphone should have a lower sound pressure than the reference microphone. And rubber cushion for microphones have significant effect on this performance. The experiment can be adapted for the design of ultra-thin case in MP4 and other communication devices.