Abstract
The good bone conduction product can make user hearing clearly and using comfortably. The bone conduction product measuring instruments (such as B＆K 4930 Artificial Mastoid) are expensive and can only simulate the functions of the specific human head part, such as the mastoid bone. Those are high precision equipments of the lab. General factories could not use them to test products at production line. As a result, bone conduction vibrator and sensor made of piezoelectric slice was used to develop an opening measurement environment of bone conduction. It can make the measurement of bone conduction product more convenient and inexpensive.
The rectangular bimorph was used as vibration source driver by IC (MAX 9788). An oval unimorph was used as a sensor and its signal was amplified by a charge amplifier. A low-vibration environment was used as a test platform for reducing vibration noise. The control system developed by LabVIEW software captures output of the charge amplifier and paints the curve of frequency response. The curve can be checked of products.
A standard bone conduction vibrator, a standard vibration sensor and piezoelectric bone conduction vibrator and sensor are cross-tested by using general electro-acoustic measurement system and the piezoelectric bone conduction measurement system. The curve of frequency response of piezoelectric vibrator is flatter than the standard vibrator. Additionally, it had large output amplitude at about 8000Hz. The frequency response of the piezoelectric sensor is 100mV higher than standard sensor. It can be used to check the product quality.
In the future, the artificial medium simulating the different parts of human head is placed between the vibrator and the sensor. It not only can make bone conduction products testing more verisimilar, but also can satisfy customer’s expectation.
第一章 序論 -------------------------------------------------------------------------------12
1.1 研究動機 -------------------------------------------------------------------------------12
1.2 研究目的 -------------------------------------------------------------------------------12
1.3 論文架構 -------------------------------------------------------------------------------13
第二章 文獻探討 -------------------------------------------------------------------------14
2.1 骨傳導聽覺原理 ----------------------------------------------------------------------14
2.2 骨傳導感測器的運用方式 ----------------------------------------------------------16
2.3電磁式骨導震動器原理 --------------------------------------------------------------18
2.4壓電材料簡介 --------------------------------------------------------------------------21
2.5 壓電片的聲頻動作 -------------------------------------------------------------------25
第三章 研究步驟與系統設計 -------------------------------------------------------26
3.1 研究步驟 -------------------------------------------------------------------------------26
3.2 系統設計 -------------------------------------------------------------------------------27
3.3 研究成果 -------------------------------------------------------------------------------35
第四章 系統測試 -------------------------------------------------------------------------38
4.1 系統測試方式 -------------------------------------------------------------------------38
4.2 測試結果 -------------------------------------------------------------------------------39
第五章 討論與結論 ---------------------------------------------------------------------44
5.1 討論 -------------------------------------------------------------------------------------44
5.2 結論 -------------------------------------------------------------------------------------45
Reference -------------------------------------------------------------------------------------46
附錄 --------------------------------------------------------------------------------------------48

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