摘要
本文首先將對行動電話上的麥克風元件、濾波電容元件、麥克風輸入電路與行動電話系統上主要干擾源進行介紹，包含電源雜訊干擾、串音干擾與無線通訊干擾等…相關問題介紹完之後,將開始介紹本文主要探討的TDMA語音雜訊干擾，並從元件與電路上來加以分析，以及介紹當麥克風遭遇到TDMA雜訊干擾時，最普遍解決使用的麥克風單端輸入電路方式，並從理論上去分析單端輸入電路方式與差動輸入電路在語音品質上的差異。 為了解決TDMA雜訊干擾問題，將對於本論文所提出的複合式濾波電路，進行濾波電容的模擬與實際上的測量，除了將濾波電容元件做單顆元件上的模擬與實際量測外，並將元件做複合性的測試，藉此來了解濾波元件上的選擇方式。同時將所測試的元件實際放入電路板上進行量測，測量當麥克風處於高TDMA雜訊干擾下，此複合式高頻濾波器是否能真正產生作用，最後再對複合式高頻濾波電路，在設計使用上所需注意事項做研究與探討，使其達到最佳的功用。 最後將比較傳統抑制TDMA雜訊干擾所使用的麥克風單端輸入電路方式與使用複合式高頻濾波電路的麥克風差動電路方式，在抑制高TDMA雜訊干擾後，語音訊號品質上的差異比較。
並列摘要
This thesis introduce how to analysis microphone components, capacitor components, microphone's input circuit and major noise of cell phone first. The system noises include power noise, cross talk and wireless noise. The TDMA noise of microphone circuit , the normally solve method is to use single end for the input circuit of microphone. To compare the difference of voice quality between differential input and single end input and analysis it with method of theory . In order to solve TDMA noise issue, the thesis will provide the method of complex filter circuit and then do the simulation and measurement of capacitor . By the experiment, it can help us to understand how to choose the best component to solve TDMA noise. To measure the performance of complex high-pass-filter circuit with the high TDMA noise condition and this will help us how to get best performance from high-pass-filter circuit. Finally, we will compare the voice performance with the single end input circuit and differential input circuit for the TDMA noise suppression.