matlab怎么提取音频

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matlab怎么提取音频

madio

使用wavread
" U# O/ Q. _: sCreate a WAV file from the example file handel.mat,
& O, w% ~+ t4 B) }and read portions of the file back into MATLAB.% Create WAV file in current folder.
0 ]9 h1 G' N1 x9 ?load handel.mat
( B7 l" O  L" Y7 d8 ]! {. w
hfile = 'handel.wav';
0 {# d1 I* q# Z1 Q6 S8 c! Cwavwrite(y, Fs, hfile)
clear y Fs

% Read the data back into MATLAB, and listen to audio.
[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);
" c: ?& r$ y6 R: L6 n, k$ l
% Pause before next read and playback operation.
+ [: F% n5 n$ X0 x# ^! Iduration = numel(y) / Fs;
pause(duration + 2)
+ r% \& i, }5 u: X0 A: i
% Read and play only the first 2 seconds.
nsamples = 2 * Fs;
[y2, Fs] = wavread(hfile, nsamples);
( R1 h/ ?$ B; @sound(y2, Fs);
! O; ^* ^* V2 R  }: O) Wpause(4)
3 j* D/ }7 k% v. i: O4 _0 h' p
1 `1 t- B* R1 U5 L. ^% Read and play the middle third of the file.
sizeinfo = wavread(hfile, 'size');

tot_samples = sizeinfo(1);
startpos = tot_samples / 3;
0 T; O6 @6 p# `. y" xendpos = 2 * startpos;
3 |; e' Z) Q% W9 i) f3 L' @& T
( O( z; H% s: a, ]( m& K[y3, Fs] = wavread(hfile, [startpos endpos]);
& F  J& U- d' d: l9 v2 gsound(y3, Fs);

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