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
1 P& P# p9 z! |! D; g3 j( }Create a WAV file from the example file handel.mat,
: [* D$ u* [, t  X2 l% hand read portions of the file back into MATLAB.% Create WAV file in current folder.
2 K* Y0 c* e. M6 V5 D- |load handel.mat
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hfile = 'handel.wav';
wavwrite(y, Fs, hfile)
3 w2 D& a; Z3 R" b0 `clear y Fs
8 R# \. Z! ?" Q
% Read the data back into MATLAB, and listen to audio.
[y, Fs, nbits, readinfo] = wavread(hfile);
7 R- [% Q2 l. k) Isound(y, Fs);

3 O9 U5 b$ L, s+ V% Pause before next read and playback operation.
7 r' N4 r* A9 o+ aduration = numel(y) / Fs;
3 c$ G6 D" y6 a+ O/ U8 spause(duration + 2)
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% Read and play only the first 2 seconds.
nsamples = 2 * Fs;
2 J0 y* k4 w  H5 W1 b5 h5 o5 r[y2, Fs] = wavread(hfile, nsamples);
6 s, `, ]4 r: d7 C3 C" Fsound(y2, Fs);
pause(4)

# l! y6 A* k: G3 y# W2 y9 o6 N% Read and play the middle third of the file.
sizeinfo = wavread(hfile, 'size');
5 |# Q8 A0 I' V0 D6 b
tot_samples = sizeinfo(1);
startpos = tot_samples / 3;
endpos = 2 * startpos;

[y3, Fs] = wavread(hfile, [startpos endpos]);
sound(y3, Fs);

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