clear all;clc;close all; Sam_rate=128;%采样率 % Au=wavread('C:\Users\user\Desktop\drop.wav'); % len32=round(11.6/1000*32*Sam_rate*1024); % len1=round(11.6/1000*Sam_rate*1024); % Win_hann=hanning(len32); % f1=Au(1:len32,1); % Af1=f1.*Win_hann; % plot(Af1,'r');hold on;plot(f1) % F_f1=fft(f1); % F_Af1=fft(Af1); % F_hann=fft(Win_hann);