frequency.m

来自「基于Matlab的八度音阶发音演奏程序」· M 代码 · 共 13 行

function f=frequency(x,fs)
dtlen=length(x);
t=(0:dtlen-1)/fs;
subplot(211);
plot(t,x);
axis tight;
y=abs(fft(x))*2/dtlen;
ff=(0:dtlen/2-1)*fs/dtlen;
subplot(212);
f=y(1:floor(dtlen/2));
plot(ff,f);
axis tight;
return;