matlab怎么提取音频

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matlab怎么提取音频

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使用wavread
Create a WAV file from the example file handel.mat,
and read portions of the file back into MATLAB.% Create WAV file in current folder.
! i0 L3 Q3 ?  T( R( a# gload handel.mat

hfile = 'handel.wav';
wavwrite(y, Fs, hfile)
* R2 \6 a' t$ K, ]" p+ O) Bclear y Fs

  l8 ]2 Y. k9 h8 c% Read the data back into MATLAB, and listen to audio.
0 P5 p; C* e- f: Y, S7 P[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);

% Pause before next read and playback operation.
duration = numel(y) / Fs;
$ s. L. W% z  N! A. Xpause(duration + 2)

) j1 t) U4 q& W7 ]. ~7 k% Read and play only the first 2 seconds.
7 T: Y  D; Y9 l/ W+ Rnsamples = 2 * Fs;
[y2, Fs] = wavread(hfile, nsamples);
1 [9 u% r+ K4 X5 m( e: c  ?sound(y2, Fs);
% K2 @5 U# \, a6 Y3 q  \* _( z+ F0 @pause(4)
. p- p' }0 d# V. O8 Y
* E$ a3 S' X+ x% c8 U, w6 C# G* B+ L% Read and play the middle third of the file.
. s8 i+ A! t/ j& Vsizeinfo = wavread(hfile, 'size');
5 E) {# y% R7 }  [2 G; v
tot_samples = sizeinfo(1);
% ~4 S2 p; k/ M+ L2 [startpos = tot_samples / 3;
8 B% j  X- `& F5 [' B8 }endpos = 2 * startpos;

4 ?' ?' ]: x" o& `7 c) U[y3, Fs] = wavread(hfile, [startpos endpos]);
sound(y3, Fs);

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