舒適聲音產生器與主動噪音等化器之開發

Development of Comfort Sound Generator and Active Noise Equalizer

張銘元(Michael Anthony)

指導教授 ： 張政元 ； 郭森楙

中原大學/電機資訊學院/電機工程研究所/碩士(2018年)

https://doi.org/10.6840/cycu201800250

摘要

本論文開發並實現了正弦波發生器，以產生確保相位連續性的舒適聲音。首先分析原始馬達聲音以獲得曲線擬合方程。分析了基於轉速變化的每個諧波的幅值水平以獲得非線性方程，以及基於轉速線性生成的背景噪聲。通過使用這些方程式，會產生人造電機聲音，並將背景噪音添加到舒適聲音以匹配原始電機聲音。僅生成具有顯著幅度級別的諧波。實驗結果用於比較生成的電機聲音與原始聲音，從0到6067 rpm。
本論文還實現了主動噪聲均衡器（ANE）來增強發動機排氣噪聲。 ANE系統基於並行形式的有源噪聲控制（ANC）系統來增強和消除某些諧波。方波信號用於模擬發動機的控制器局域網（CAN）總線。首先分析方波信號，發動機轉速和基頻之間的關係，以便產生包含諧波和寬帶噪聲的發動機排氣噪聲。主要和次要路徑也被分析。進行三個實驗，這些實驗是（1）固定的發動機轉速，（2）將發動機轉速從2350加速到4506rpm，以及（3）在15秒內將基頻從80增加到150Hz。前三個諧波得到增強，其他諧波被取消。主路徑影響從主揚聲器發出的信號的幅度響應。由於主要和次要路徑的頻率響應差，有一些頻率範圍難以控制。
關鍵詞：舒適發聲器，正弦波發生器，相位連續性，有源噪聲均衡器，方波。

關鍵字

舒適的發聲器 ； 正弦波發生器 ； 相位連續性 ； 有源噪聲均衡器 ； 方波

並列摘要

This thesis develops and implements the sine wave generator to generate comfort sound with assured phase continuity. The original motor sound is first analyzed for curve fitting equations. The magnitude level of each harmonic which changes based on rotation speed is analyzed to get nonlinear equations, as well as the background noise which is generated linearly based on the rotation speed. By using the equations, the artificial motor sound is generated and background noise is added to the comfort sound to match the original motor sound. Only harmonics with significant magnitude level are generated. The experimental results are used to compare the generated motor sound with the original, from 0 to 6067 rpm.
This thesis also implements active noise equalizer (ANE) to enhance the engine exhaust noise. The ANE system is based on parallel form active noise control (ANC) system to enhance and cancel certain harmonics. Square wave signal is used to mimic the controller area network (CAN) bus of the engine. The relation between the square wave signal, engine rotation speed, and the fundamental frequency is first analyzed in order to generate the engine exhaust noise, which contains harmonics and broadband noise. The primary and secondary paths are also analyzed. Three experiments are conducted, which are (1) the fixed engine rotation speed, (2) accelerating engine rotation speed from 2350 to 4506 rpm, and (3) increasing fundamental frequency from 80 to 150 Hz in 15 seconds. The first three harmonics are enhanced and the others are canceled. The primary path affects the magnitude response of the signal coming out from the primary loudspeaker. Due to the poor frequency responses of the primary and secondary paths, there are some frequency ranges that are hard to control.
Keywords: Comfort sound generator, Sine wave generator, Phase continuity, Active noise equalizer, Square wave.

並列關鍵字

Comfort sound generator ； Sine wave generator ； Phase continuity ； Active noise equalizer ； Square wave

參考文獻

References

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