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研究生:丁致超
研究生(外文):Din, Chih-Chao
論文名稱:主動式噪音消除器之研製
論文名稱(外文):The Design of a Active Noise Cancellator
指導教授:陳志明,
指導教授(外文):,
學位類別:碩士
校院名稱:國立台灣工業技術學院
系所名稱:電機工程技術研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:82
中文關鍵詞:噪音消除
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摘要
隨著工商業的高度發展,噪音污染的問題也日益嚴重。傳統上用來因應這
個問題的技術,主要的是對於環境與噪音源進行隔離。然而這種被動的防
堵方式隔離,其實存在許多不可忽視且不容易克服的問題。例如其成本昂
貴,容易造成通風不良以及效果不彰等。主動式噪音消除器的理論乃是透
過一個與噪音聲波相位差一百八十度左右的聲波,利用疊加原理造成破壞
性干涉,以達到降低噪音量的效果。這種技術,由於近年來微電子學的快
速發展,以及適應性信號處理的理論逐漸成熟,已經到了可以實際應用的
地步。
本論文中應用適應性信號處理的理論並結合數位信號處理器,設計與製作
一個適應性濾波器,以主動式噪音消除的方式,降低噪音的音量。其硬體
架構上,係以TMS320C31作為中央處理器,並基於縮小電路板面積及簡化
其複雜度的考量下,本系統盡可能的採用大型的可程式元件,例如FPGA,
GAL等,以減少系統中元件的用量並增進整體系統的改善空間。軟體程式
及系統部分,則應用適應性信號處理的理論,根據以VSS法則為基礎的演
算法,使系統具有快速追蹤及減小穩態誤差修正量的主要特性。最後,並
針對日常生活中常可聽到的風扇與冷氣訊號,做為實驗的噪音源,提出應
用袈測器與雙感測器的方法,做噪音消除的實驗,並驗證本計畫中主動式
噪音消除器的可行性。
Abstract
With the industrial developments and the expansion of commercial
activities, noise pollution is gradually growing into a very
serious problem. To suppress the acoustic noises, there are a
lot of conventional damping techniques can be used. However, all
these passive techniques are often costly and ineffective in
general. To cope with this problem, active noise control which
is to generate an acoustic antifield such that the undesired
noise can be interfered destructively has been researched for
years. Limit by the microelectronic technology at the time, this
technique was generally considered as impractical just a few
years ago. Recent developments in the microcomputers,
electronics, digital signal processing and other related areas
have made the active suppression of the acoustic noise possible.
In this thesis, based on the adaptive signal processing
theories, an adaptive filter is designed to reduce the noise
level and is implemented in a digital signal processor. The
hardware circuit is centered around the DSP chip, TMS320C31. All
other necessary supporting circuit are then built and tested. In
order to reduce the complexity of the circuit and the size of
the circuit board, some advanced, programmable integrated
devices such as FPGA, GAL are implemented in the design. To make
sure that the systeman not only adjust along with the change of
noise waveform fast enough, but also maintain a very small
misadjustment, the VSS (Variable Step Size) algorithm is
specially implemented for this purpose. Additionally, two
different noise cancellation schemes are proposed for single and
double microphone (sensor) systems. Finally, fan and air
conditioner noises are tested for both designs.
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