- 會議論文
以TI TMS320C6713 DSP實現適應陷波濾波器於主動式噪音控制
Adaptive Notch Filter Design for Active Noise Control Using Ti TMS320C6713 DSP
摘要
此次希望提出傳統回授式FXLMS演算法加入陷波濾波器來改善單頻噪音時控制器階數過大的情形，提出在管路減噪系統中，將FXLMS演算法搭配運用陷波濾波器，一樣可達到減噪效果，傳統FXLMS中控制器需要大量參數，才能實現其效果。而若加入陷波濾波器的概念，便能降低控制器的階數，再經由模擬與實驗中去驗證，經過一連串之轉換分析，分離出正確的誤差訊號，之後將訊號中A/D轉換給數位訊號處理器作為第二路徑控制器使用。此時，藉由FXLMS演算法線上更新權重，再透過控制器所計算產生的反噪音訊號，輸出D/A給揚聲器，就可經由此種主動式的破壞性干涉，達到大幅降低於傳統FXLMS演算法中，控制器階數之問題也就能夠大幅降低，提升此演算法之運用方法。
關鍵字
無資料並列摘要
This paper will present an active noise control system that uses a Notch filter to extract the correct residual noise in a duct for controllers that will provide primary noise attenuation. A Feedback active noise control structure is to be employed with the filtered-X least mean square (FXLMS) algorithm for on-line controller tuning. To process the contaminated error signal, a notch filter and a classical Butterworth low pass filter are applied. Notch Filter has demonstrated the effectiveness of the two applied filters in suppressing the primary noise in the duct through computer simulations and experiments. As compared to other methods, this is an effective active noise control.