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,
* J) Y& b6 b9 f% b/ ]7 L% Eand read portions of the file back into MATLAB.% Create WAV file in current folder.
load handel.mat

+ u1 J" y1 D8 ~& m! ~+ ^hfile = 'handel.wav';
& v) c4 t6 H) c" D' t3 q) j% Owavwrite(y, Fs, hfile)
clear y Fs
& N" h; A) O8 E) z+ V9 x
8 Q0 n7 @# T; r! M. ~% Read the data back into MATLAB, and listen to audio.
3 y+ x9 p6 z' G% W4 [, t5 e[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);
$ e4 ?7 q  [' Y- b4 b8 X
9 V# a6 Y) _6 g1 c8 H6 J% Pause before next read and playback operation.
% V* F% `1 d% f4 M& {9 ^duration = numel(y) / Fs;
pause(duration + 2)
/ I% V/ Y2 ^1 M" F& ?# X1 `: c- Z: I
% Read and play only the first 2 seconds.
2 W' V" J; W$ u) ~2 s8 I( Y3 Dnsamples = 2 * Fs;
[y2, Fs] = wavread(hfile, nsamples);
sound(y2, Fs);
' o8 ?. i6 P* y0 W2 x: ?& N4 cpause(4)
1 A7 r+ n* S: u# |
% Read and play the middle third of the file.
sizeinfo = wavread(hfile, 'size');

$ D) [- }* Z( \% ?  V6 ~( Y! J' `tot_samples = sizeinfo(1);
startpos = tot_samples / 3;
endpos = 2 * startpos;
# r7 ^( G  b# P* {
4 }9 ]+ s) n  r# Q[y3, Fs] = wavread(hfile, [startpos endpos]);
2 q3 k- Q3 H+ _( h8 q$ O5 Jsound(y3, Fs);

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