matlab頻譜分析實(shí)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(tǒng)實(shí)現(xiàn)信號(hào)頻譜分析與顯示的方法。Matlab是具有很強(qiáng)的科學(xué)計(jì)算和圖形顯示界面的軟件系統(tǒng)。該法可對(duì)語音信號(hào)（或其它類型的似平穩(wěn)信號(hào)）進(jìn)行基于FFT的短時(shí)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(shè)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(guān)功能函數(shù)，并給出了一個(gè)程序?qū)嵗捌鋵?shí)驗(yàn)結(jié)果。實(shí)驗(yàn)結(jié)果表明，該法所需的編程簡單，對(duì)設(shè)備硬件要求不高，易于實(shí)現(xiàn)，能快速地在普通通用PC機(jī)上完成信號(hào)的頻譜分析和頻譜圖顯示。包含有實(shí)例程序。