考慮聲音品質之複合式主動式噪音控制器設計

Abstract

本篇論文題出一套噪音消除控制器設計方法，先以前饋控制器獲得一定消噪效果，再以回授控制器加強噪音消除效果，最後補償受到回授控制器影響的線路輸入頻率響應。同時在設計回授控制器時，調整最佳化參數，以心理聲學(Psychoacoustic)參數－舒適度(Pleasantness)作為指標，有別於一般噪音控制只追求噪音能量降低，本篇論文考慮人耳聽覺的特性，追求噪音控制後主觀感受的舒適度，降低殘留的噪音對人體身理心理的負面影響。

本篇論文大致分為幾部分： 第一部分為主動式噪音控制的歷史發展及研究動機、目的。 第二部分是環境參數的測量。 第三部分推導三種控制器的設計。 第四部分介紹用做評估的心理聲學參數。 最後是模擬結果與結論。

In this thesis, we apply a set of active noise control system. Involved feedforward controller, feedback controller and line-in compensation. First we design a feedforward controller to obtain some noise reduction effect, and then design feedback controller, in case of non-uniform frequency response of human hearing system, the optimization parameter will vary in the different frequency band while designing feedback controller, and using an empirical model which could predict the sound quality of a sound to ensure the residual noise is comfort, the sound quality model combines four psychoacoustic parameter: loudness, sharpness, roughness and tonality. At the end, design a line-in compensator to compensate feedback controller’s negative impact.

The first part will introduce active noise control techniques history and the motivation of this research. The second part is the measurement of environmental parameters. In the third part describes controller and compensator design methods. The forth part introduces the calculation of psychoacoustic parameters. Finally, the simulation results and conclusion are discuss.