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发表于 2013-11-7 10:11
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使用wavread4 H/ Z$ b, L* K
Create a WAV file from the example file handel.mat,5 T V: |3 Q: p
and read portions of the file back into MATLAB.% Create WAV file in current folder.5 x$ Y: L5 q: `9 P7 P. o
load handel.mat
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hfile = 'handel.wav';
( a8 F9 T2 W* u& c1 [wavwrite(y, Fs, hfile)
+ x, q/ h6 n$ S: W3 j* z4 _' g8 Fclear y Fs
( D5 S* Q8 G( x. ]4 ? {1 Y" A% A( a
% Read the data back into MATLAB, and listen to audio.
% S b7 W9 [ k) e% g- E- [/ Z[y, Fs, nbits, readinfo] = wavread(hfile);
4 \' f A, J8 ~8 x9 K7 Jsound(y, Fs);4 D4 \1 R8 [4 i D: F( ~. t( H
' @* Y0 Q9 p8 E( I* s/ T' F7 X% Pause before next read and playback operation.. h' S0 M, F& z/ Y9 h: P
duration = numel(y) / Fs;
9 Y$ y; @5 z6 `pause(duration + 2)) l, K& r) O8 ?8 C2 {9 w( H
3 R# z# W4 m& Q0 w: h9 N* s
% Read and play only the first 2 seconds.
- E9 Y. O8 T7 d- |8 gnsamples = 2 * Fs;0 z& \4 L0 V( O% w1 ^: o/ J
[y2, Fs] = wavread(hfile, nsamples);7 G5 m# U' e& n, I3 q" @- r5 |3 s! h
sound(y2, Fs);2 R+ }' Y: |+ h6 W" w7 [
pause(4)/ d7 P8 E& b- _0 u1 ?
3 ]/ o3 f' k: j; f, w% Read and play the middle third of the file.
& T5 m3 } L1 z2 ?2 G8 Psizeinfo = wavread(hfile, 'size');
9 W! H) I* x" ? & N: K& s' v9 t$ Y
tot_samples = sizeinfo(1);/ j( D) `% S) I. o) I' ]( [2 k
startpos = tot_samples / 3;( N) v& k: _4 Q! i3 n
endpos = 2 * startpos;- u; @1 \8 K; x5 A
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[y3, Fs] = wavread(hfile, [startpos endpos]);
0 n+ f) ?& S3 a8 l) Z% @7 `sound(y3, Fs); |
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发表于 2013-11-6 21:05
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