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題 名 | Active Control of Acoustic Transmission of a Narrow-Band White Noise Source in an Aperture=狹縫管道窄頻寬白色噪音源音響傳輸之適應性主動控制 |
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作 者 | 陳國在; 劉雲輝; 陳永祥; 薛文証; | 書刊名 | 中華民國音響學刊 |
卷 期 | 4:1 1996.12[民85.12] |
頁 次 | 頁21-38 |
分類號 | 471.9 |
關鍵詞 | 適應性濾波器; 音響傳輸; 狹縫; 主動控制; 白色噪音; 窄頻寬; Adaptive filter; Sound transmission; Aperture; Active control; White noise narrow-band; |
語 文 | 英文(English) |
中文摘要 | 本文之探討,利用適應性控制器進行狹縫管道中窄頻寬白色音源,其引致聲音傳 輸之主動控制研究, 因此一個由 24 階之 IIR 濾波器結合 II 階 FIR 濾波器所組成之 ARMA 濾波器被選為本研究之適應性濾波器, 其相關誤差路徑係當成固定增益,如此即可大 幅減化其必要之計算並提昇所使用控制系統之運算效率。 本研究之結果顯示, 窄頻寬白色噪音在狹縫管道所產生之音響傳輸或音壓衰減, 於 600Hz 以下可分別獲得為 20 與 12dB。 |
英文摘要 | The active control on the sound transmission produced by a narrow-band white noise source in aperture by using an adaptive controller is discussed in this paper. An ARMA filter of combining a 24th order IIR filter with a 11th order FIR filter is used as the required controller, its corresponding error path is considered a constant gain in order to greatly reduce the involved calculation and to raise the performance of the used adaptive system. The result of the study shows that the acoustic attenuation by almost 20 dB of the acoustic pressure level produced by a narrow-band white noise sources in an aperture at frequency below 600 Hz are reached. Its correspnding attenuation by almost 12 dB of acoustic transmission power is also obtained. |
本系統中英文摘要資訊取自各篇刊載內容。