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,
and read portions of the file back into MATLAB.% Create WAV file in current folder.
8 g& y) o, [& Q3 ?load handel.mat

  h2 Y9 [7 n( d+ N9 J# Jhfile = 'handel.wav';
wavwrite(y, Fs, hfile)
clear y Fs

% Read the data back into MATLAB, and listen to audio.
9 n5 s! D) d8 m: a9 o( ?) @0 j1 v[y, Fs, nbits, readinfo] = wavread(hfile);
3 k" l9 X1 L, N! b( S' X  ^) Jsound(y, Fs);

* J  q" F6 O5 o/ u# Q' |6 C% Pause before next read and playback operation.
duration = numel(y) / Fs;
pause(duration + 2)

, S( A3 z" A0 m' S9 }! V% Read and play only the first 2 seconds.
nsamples = 2 * Fs;
2 I( e; m: }, _8 ^; Y! ?[y2, Fs] = wavread(hfile, nsamples);
sound(y2, Fs);
2 ?' w7 U5 |" ^; _, |$ kpause(4)
) ]5 D. j- h, m% v: `$ i
- ?) w& W- s* j& X3 p+ C% ^% Read and play the middle third of the file.
sizeinfo = wavread(hfile, 'size');
3 J7 H9 M7 m0 }# p: x& n3 u
: k0 g2 N! Y/ w, }tot_samples = sizeinfo(1);
startpos = tot_samples / 3;
6 F" _3 X" Z% J# a% m% bendpos = 2 * startpos;
7 K# Y+ |/ ~% D% u' O# F, [. f( c
[y3, Fs] = wavread(hfile, [startpos endpos]);
- q3 r' w1 [* ^! j# Psound(y3, Fs);

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