matlab頻譜分析實例： A method to implement the spectrogram analysis and display of signals using Matlab is proposed. The FFT based spectrogram of speech signals, or other similar quasi-stationary signals, can be calculated and displayed with pseudo-color mapping. Both wide-band and narrow-band spectrogram and different pseudo-color mapping kinds are optional. Experimental results show that the proposed method can be implemented easily without complicated programming and strict requirement of hardware. A general PC with Pentium-Ⅰ CPU is enough to accomplish the analysis and display of the spectrogram of a signal quickly.">給出一種用Matlab系統實現信號頻譜分析與顯示的方法。Matlab是具有很強的科學計算和圖形顯示界面的軟件系統。該法可對語音信號（或其它類型的似平穩信號）進行基于FFT的短時頻譜分析，頻譜圖的偽彩色映射及顯示。頻譜圖的類型有寬帶和窄帶兩種，偽彩色顯示的映射可按需求設置。文中介紹了基于FFT頻譜分析與頻譜圖顯示的原理，Matlab的相關功能函數，并給出了一個程序實例及其實驗結果。實驗結果表明，該法所需的編程簡單，對設備硬件要求不高，易于實現，能快速地在普通通用PC機上完成信號的頻譜分析和頻譜圖顯示。包含有實例程序。