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
! m% Y) t- v/ M% I1 z6 Z( sCreate a WAV file from the example file handel.mat,
3 |% b0 `; B8 `! z, [+ kand read portions of the file back into MATLAB.% Create WAV file in current folder.
& B9 R- D/ ~  g- z% G; u$ B* zload handel.mat
4 ~' @* O( e- V0 k( q1 B: [
hfile = 'handel.wav';
' P. R0 v: \" p0 J/ b) M! y% kwavwrite(y, Fs, hfile)
clear y Fs
$ z. p$ h6 G8 u* |* M) K' l
( v7 a- G4 |# G$ s% Read the data back into MATLAB, and listen to audio.
- `# t* p7 f, H7 c6 `0 d# U[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);
) z1 `$ N$ F6 Z* W+ h" L& {) @: U
% Pause before next read and playback operation.
duration = numel(y) / Fs;
3 p) A" d) N0 S- `pause(duration + 2)
- h& A: C4 p9 H2 B3 U: u* g
: K. X& w6 j* m; @% Read and play only the first 2 seconds.
nsamples = 2 * Fs;
; z/ b8 W! a# E. ?$ y[y2, Fs] = wavread(hfile, nsamples);
sound(y2, Fs);
9 t3 C3 \: {: Rpause(4)

7 x) E6 @7 a9 y7 C- [2 C/ T6 n% l% Read and play the middle third of the file.
sizeinfo = wavread(hfile, 'size');

tot_samples = sizeinfo(1);
startpos = tot_samples / 3;
, y  [) L* B3 ]. b! lendpos = 2 * startpos;
% B* v; ?# r% g
[y3, Fs] = wavread(hfile, [startpos endpos]);
sound(y3, Fs);

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