Matlab查看信号频谱

plot_freq.m

clear;clc;
maindir = 'D:/EDUCATION/datasets/';
subdir='XXX/';
subdirpath = fullfile( maindir, subdir, '*.wav' );
dat = dir( subdirpath );               % 子文件夹下找后缀为wav的文件
for i = 1 : 1 : 12
    datapath=dat( i+25 ).name;
    name=datapath(22:end);	% wav文件名较长，截取部分文件名作为图片标题
    filename = fullfile( maindir, subdir, datapath);
	info = audioinfo(filename);   % 提取信号附加信息，如采样率、信号时长等
	[y,Fs] = audioread(filename);
    y=y(60*Fs+1:61*Fs);   % 随便取1s数据分析
    y = y-mean(y);
    y_fft=abs(fft(y));
    subplot(3,4,i);
    plot(y_fft);
    ylim([0 120])
    xlim([0 length(y_fft)/2])
    title(name)
end