耳鳴患者約佔英國及美國的總人口數的17%；而且耳鳴病患會隨著年齡的增加而增多，在65歲以上的老年人口中耳鳴人數也大約有30%，嚴重的耳鳴噪音有時會影響到正常的生活。目前市面上的耳鳴治療器價格昂貴而且多以寬頻雜訊做為治療音源，卻忽略不同患者之間耳鳴狀況的差異以及了有超過七成的耳鳴患者同時有合併聽力損失的問題。長期配戴對患者正常聽覺往往會造成不必要的傷害。
　　根據耳鳴遮蔽法及耳鳴減敏療法的理念，本研究發展建構一窄頻耳鳴雜訊產生平台，提供耳鳴病患特定頻段及特定音量的聲音治療，讓此本土化科技輔具能改善目前一般耳鳴寬頻治療器的缺點。
　　本系統軟硬體使用PC、頭戴式耳機、以MSP430F169微處理晶片為主的Dlr169電子模擬板、FLASH Emulation Tool軟體發展工具。應用數位訊號處理以軟體技術撰寫產生亂數值的指令成為寬頻訊號做為系統的白色雜訊，並在晶片中執行FIR濾波演算。以MATLAB的FDATool設計濾波器參數輸入至系統程式，將系統程式燒錄至Dlr169模擬板，再由模擬板進行濾波運算，最後以揚聲器發出雜訊。
　　目前本系統已完成初部雛型，本研究針對濾波參數設計時的變數，分析不同阻帶頻寬及階數等多種濾波情況，以輸入及輸出的品質因子差異，判斷合適使用的雜訊以滿足耳鳴患者的需求，並建立系統的音量校正表，其校正結果在可接受的範圍。本研究以耳鳴病患的病例做為驗證資料並與耳鳴測量平台的雜訊做比較，發現本系統具有較佳的效果及實用性。
　　本研究未來可朝：1.探討系統所產生的窄頻雜訊對於耳鳴病患的療效， 2.發展俱備窄頻耳鳴聲音治療及助聽復健平台。

　There are 17% of the total population suffering from Tinnitus in UK and USA; the prevalence of tinnitus patients has been increasing with the aging. There are approximately 30% of the elderly population suffering from Tinnitus. The noises from tinnitus have influenced seriously on the daily life for tinnitus patients sometimes. Currently, most of tinnitus devices are to provide wide-band noises for therapeutic purpose, and also expensive. The disadvantages of using wide-band therapeutic noises are: (1) tinnitus patients are suffering from noises with varied frequency bands and intensities; (2) more than 70% of patients also suffering from hearing loss usually at high frequency regions. When tinnitus patients have wear the current wide-band noise device for a period of time, they are usually at high risk of hearing loss. This research, based on the Tinnitus Masking and TRT for patient’s specific frequency band and volume, is to design and develop a microprocessor-based platform to provide customized band-pass noise for the tinnitus. This DSP technique would like to improve the shortcoming of current wide-band noise generator and ultimately be beneficial to the tinnitus.
　This system consists of a PC, Dlr169 emulation board with MSP430F169 chip, earphone, FLASH Emulation Tool for software programming and JTAG transmission line. A wide-band white noise, which is generated through random numbers in PC, is input to the Dlr169 for FIR filter processing. Filter parameters and processing programs, which are designed and programmed through FDATooL of MATLAB, are then down-loaded to the Dlir169. The prescribed narrow-band noise with volume are then output from the speaker.
　The prototype of narrow-band noise platform has been completed. The system calibration has been investigated for different stop bandwidths and rank and volume intensities on optimal parameter design in order to provide high quality narrow-band noises. A comparative study is conducted and the results indicate that the microprocessor-based system provides better narrow-band noise quality than the PC-based platform system.
　A clinical investigation on using the system is suggested in the future.

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