基于Matlab系统的信号FFT频谱分析与显示

FFT Based Spectrogram Analysis and Display of Signals Using Matlab

给出一种用 Matlab系统实现信号频谱分析与显示的方法 .Matlab是具有很强的科学计算和图形显示界面的软件系统 .该法可对语音信号 (或其它类型的似平稳信号 )进行基于 FFT的短时频谱分析 ,频谱图的伪彩色映射及显示 .频谱图的类型有宽带和窄带两种 ,伪彩色显示的映射可按需求设置 .文中介绍了基于 FFT频谱分析与频谱图显示的原理 ,Matlab的相关功能函数 ,并给出了一个程序实例及其实验结果 .实验结果表明 ,该法所需的编程简单 ,对设备硬件要求不高 ,易于实现 ,能快速地在普通通用

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.