Design of Active Noise Control Based on Digital Signal Processor

• Main Authors: Chih-Ming Wang, 王志銘
• Other Authors: Shun-Hsyung Chang
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/17601627624451865760

碩士 === 國立海洋大學 === 電子工程學系 === 82 === For the purpose of fighting against environmental acoustic noise,researchers already have been taking the initiative, from former passive methods of developing many kinds of sound absorbers made of different material and altering the geometric design of structure to prevent noise to current active noise control(ANC),using the strategy of "an eye for an eye",which utilitize the effect of destructive interference produced by sound wave superposition in order to reduce noise. Of course , the good result will give credit to the rapid development of digital signal processor(DSP) these years,so that many kinds of complicate algorithms could get the real-time execution.DSP get the leader position within the whole system.Every noise sample detected from the microphone is then output after being processed rapidly by the DSP.This thesis adopts the TMS320C30 DSP made from TEXAS ability of 33.3 MIPS so that it is qualified for this research. In experiments,adaptive filter was adopted.First,software simulation was done to analyze the performance of each algorithm to seareh the best one for the system,and then put into the DSP in terms of assembly language. The performance of reducing noise has been certified through experiments. The domain of this research is still on the stage of introduction in domestic. ANC will cause revolution affect among national deffence, industrial and consumption products and will have unlimitted development in the future,especially under the going up consciousness of environmental protection this present age.