matlab怎么提取音频

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matlab怎么提取音频

madio

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.
load handel.mat
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9 G1 s  X+ r* @% ohfile = 'handel.wav';
wavwrite(y, Fs, hfile)
clear y Fs
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- W4 @/ x* B0 f4 n" X% Read the data back into MATLAB, and listen to audio.
[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);
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/ @& [1 a+ t1 Z% Pause before next read and playback operation.
" Q6 R& D1 e# a7 Q; Oduration = numel(y) / Fs;
pause(duration + 2)

0 j1 i( E! K) G+ o% Read and play only the first 2 seconds.
+ J+ |. c- k, e7 M% D8 r* Y+ wnsamples = 2 * Fs;
[y2, Fs] = wavread(hfile, nsamples);
3 ?& ~, N1 Y0 a- Z/ bsound(y2, Fs);
" x! F( O; u) @; r% J+ Ypause(4)
2 u" {5 J5 J9 p
4 p/ j4 c( w' C0 A& o* J% Read and play the middle third of the file.
sizeinfo = wavread(hfile, 'size');
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5 m5 v1 F% p' m# m( ^. A# h5 n2 utot_samples = sizeinfo(1);
; m" a6 E& a' O! }  o7 Ystartpos = tot_samples / 3;
endpos = 2 * startpos;
; k+ g6 W# ~; J
[y3, Fs] = wavread(hfile, [startpos endpos]);
sound(y3, Fs);

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