[y,fs,nbits]=wavread ('1.wav');
figure(1);
plot(y);
title('原始语音信号');
xlabel('时间 t');
ylabel('音量 n');
set(gca,'Fontname','Monospaced');
figure(2);
y1=fft(y);
y1=fftshift(y1);
derta_fs=fs/length(y);
plot([-fs/2;derta_fs:fs/2-derta_fs],abs(y1));
title('原始语音信号频谱波形');
set(gca,'Fontname','Monospaced');
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