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
2 N1 Q: g) x! d- N" kCreate a WAV file from the example file handel.mat,
and read portions of the file back into MATLAB.% Create WAV file in current folder.
: f0 a8 d  b, n7 g9 W- B4 p2 L! t$ {load handel.mat

" z  L  v$ P& K: S1 E2 @3 D2 Lhfile = 'handel.wav';
wavwrite(y, Fs, hfile)
6 I, ^3 G) Q- A6 D) Q2 Oclear y Fs
2 f: i5 d6 w# k" ]% B: T7 [
* j# e4 s2 V* L! u& y% Read the data back into MATLAB, and listen to audio.
[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);

% Pause before next read and playback operation.
! T  E2 J4 l2 O  A# k& Q# sduration = numel(y) / Fs;
) `( m9 |! n! @- }$ Gpause(duration + 2)

% Read and play only the first 2 seconds.
nsamples = 2 * Fs;
[y2, Fs] = wavread(hfile, nsamples);
sound(y2, Fs);
pause(4)
( q5 j3 k, p, J$ R
% Read and play the middle third of the file.
6 Y9 n6 q6 _: }# Rsizeinfo = wavread(hfile, 'size');
( {8 R3 n- w. A' d/ G: x+ _7 S2 [
3 b* S. ^+ {) [* E+ z7 Itot_samples = sizeinfo(1);
startpos = tot_samples / 3;
* o5 B* {3 d! h. M$ x8 h3 E  f& Y5 [endpos = 2 * startpos;
3 W& f' H2 k- z" V  a' G
* r- d. T* K( y4 U1 r/ |) p5 h[y3, Fs] = wavread(hfile, [startpos endpos]);
sound(y3, Fs);

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