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.
/ ?: w6 R! E6 Q, [9 ?load handel.mat

; f" T2 i) a7 F; w6 ]9 @# qhfile = 'handel.wav';
wavwrite(y, Fs, hfile)
- n- G0 X/ r6 u' k5 e9 z7 _clear y Fs
& W. W1 b1 e& ^* x/ B: d, \
7 c/ C# [; P4 g* b' c. ]; ]6 F$ R! _% Read the data back into MATLAB, and listen to audio.
. G/ i' q8 C; k+ z[y, Fs, nbits, readinfo] = wavread(hfile);
0 g5 _+ k0 ~( `8 @( ]7 Wsound(y, Fs);

; y' b; p6 t7 q3 K0 X1 {0 Y. W7 ~2 I% Pause before next read and playback operation.
( L. X% ^7 i4 m- I- {! r* a* Vduration = numel(y) / Fs;
% g$ L9 c% I# m4 O5 D0 M$ npause(duration + 2)
) q; s! |( @3 U) U1 c
) [$ _( p1 ?& E; g/ J( q$ P% Read and play only the first 2 seconds.
4 |3 e% g3 N3 f) h5 J5 V( B% Hnsamples = 2 * Fs;
[y2, Fs] = wavread(hfile, nsamples);
: b8 ?6 ?/ d: U% @! T- H; P3 Jsound(y2, Fs);
9 r0 r( B  v' a- U3 P" lpause(4)
0 E& F* O) T3 O2 `4 U
% Read and play the middle third of the file.
sizeinfo = wavread(hfile, 'size');
" A& g& x4 m5 U$ _! n
tot_samples = sizeinfo(1);
startpos = tot_samples / 3;
endpos = 2 * startpos;

[y3, Fs] = wavread(hfile, [startpos endpos]);
+ |/ [; V- m+ E' Y4 t1 [% x2 Fsound(y3, Fs);

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