MATLAB.rar_傅立叶变换_功率谱 matlab_功率谱分析_短时傅立叶_短时傅立叶变换

[x1,fs1,bits1]=wavread('C:\Documents and Settings\hp\My Documents\MATLAB\ak47-1.wav'); %???? plot(real(x1)); hold on; plot(imag(x1),'r*--'); legend('??','??'); xlabel('?? t'); ylabel('?? A'); %????????? [s,f,t]=spectrogram(x1); %?? figure(2) plot(t,abs(s)); xlabel('?? t'); ylabel('?? A'); %?? figure(3) plot(t,angle(s)); xlabel('?? t'); ylabel('?? phi'); %???? figure(4) contour(t,f,abs(s)); xlabel('?? t'); ylabel('?? f');