迴授式主動噪音控制應用於車廂內噪音

傳統的車廂內噪音降噪技術，大多使用被動式降噪原理，利用吸音或隔音材料來減少噪音。但此種方法運用在低頻噪音時，往往效果不彰。主動式噪音控制方法因而產生，其對低頻噪音的減噪效果較佳。本論文以主動噪音控制理論為基礎，應用於車廂內噪音減噪。利用數位訊號處理器TMS320C6713DSK來實現，以頭枕型式的減噪喇叭來降低駕駛人耳邊的噪音。本文採用迴授式控制系統架構，第二路徑轉移函數採用FIR(Finite Impulse Filter)濾波器架構，並討論濾波器的階數對FXLMS、Leaky FXLMS、FXNLMS三種演算法的影響。實驗是在車廂內發出單頻、複頻以及頻帶的噪音，藉由改變噪音的聲壓大小和增加實驗時間來比較三種演算法的減噪效果和穩定性。

關鍵字

主動噪音控制； Feedback ANC ；車廂內噪音控制

並列摘要

The interior noise of car is usually reduced by passive noise reduction method, which uses sound-absorbing or sound-isolation materials to reducenoise.However, this technique is ineffective on low-frequency noise.Therefore as a result emerges the active noise control method (ANC), which is successful to reduce low-frequency noise.Thisresearchstudies the application of active noise control theory to reduce car cabin noise. The implementation of ANC uses the digital signal processor TMS320C6713DSK. This study uses feedback control system and the secondary-path is modeled by FIR (Finite Impulse Filter) filter. The influencesof filter length in theFXLMS,Leaky FXLMS and FXNLMS algorithm are discussed. In order to compare the noise reduction and stability of FXLMS,LeakyFXLMSandFXNLMS algorithm, experimentsare conducted in single-tone noise,dual-tone noise and frequency-band noise conditions, bychangingnoisesound level and experimental time.

並列關鍵字

Active Noise Control ； Feedback ANC ； Car Interior Noise Control

參考文獻

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[18] 吳江凱，空間窄頻噪音主動控制之理論探討與實作，碩士論文，國立臺灣大學工程科學及海洋工程研究所，台北，2004。

[2] H. F. Olson and E. G. May, “Electronic sound absorber,” J. Acoustic Soc. Am., vol. 25, Nov. 1953, pp. 1130-1136.

[3] H. F. Olson, “Acoustic electronic control of noise, vibration and reverberation,” J. Acoustic Soc. Am., vol. 28, Sept.1956, pp. 966-972.

[4] B. Widrow and S. D. Stearns, “Adaptive Signal Processing,” Cliffs, NJ: Prentice-Hall, 1985.

國際替代計量

迴授式主動噪音控制應用於車廂內噪音

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