QFT 噪音消除與3D 音訊訊號處理整合至耳機/行動電話

Abstract

當我們在使用耳機或手機時，我們可能會收到週遭環境噪音的影響。這時，我們需要一個裝置來抵抗消除外界干擾。我們以量化回授理論(QFT)為基礎，針對耳機以及手機這兩種狀況設計控制器。量化回授理論(QFT)是利用回授的方式，對於受控裝置的不確定性(uncertainties)和設計規格的容忍度皆給予數量化，在期望的性能條件和要求下，達到設計的目的。我們用類比電路取代數位訊號處理器(DSP)來實現整個回授系統，此目的避免數位訊號處理器輸入跟輸出造成訊號延遲，可達到即時的控制效果。 另外，我們再利用數位訊號處理器(DSP)將3D 音訊訊號處理整合至耳機跟手機上。此部份針對耳機跟手機不同的使用方式，結合不同的3D 音訊處理。3D 音訊的處理包括定位感和空間感，可增強聲音的深度，廣度及殘響度。

It happens that we could hear the noise form the environment, when using the headset/ cell phone. For the reason, we need a device to eliminate the outside disturbances. We design the controller of a headset/cell phone based on Quantitative Feedback Theory (QFT). Quantitative Feedback Theory (QFT) is a unified theory that emphasizes the use of feedback for achieving the desired system performance tolerances despite plant uncertainties and plant disturbance. To achieve the instantaneous control and avoid delay of signals of the digital signal processor (DSP), we use analog electric circuit to realize the feedback system instead of DSP board. In addition, we use the DSP to integrate 3D audio effects into the headset/cell phone. This part aims at that we combine different 3D audio processors on the headset/ cell phone, because of different using ways. The 3D audio processors include localization and spaciousness to increase the depth, width, and reverberation of sounds.