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.
8 ^. d6 Y- n  r; wload handel.mat

3 O! A+ _6 I8 u/ e/ I5 Fhfile = 'handel.wav';
wavwrite(y, Fs, hfile)
clear y Fs
* i& \8 ?2 Y$ ^5 s2 o
% Read the data back into MATLAB, and listen to audio.
+ d; S& x$ `3 `8 V9 n2 \[y, Fs, nbits, readinfo] = wavread(hfile);
9 K- e" [7 p5 Rsound(y, Fs);
5 [" z# G2 O7 i( j3 w; g" }
% Pause before next read and playback operation.
- ?4 n- q4 S) ?; A7 z- pduration = numel(y) / Fs;
pause(duration + 2)
+ }; Y: z3 l  H# ~+ f! W
- ?3 g! E$ T6 E. D! R  k" T* w, X% Read and play only the first 2 seconds.
- y; t! k3 D2 y/ ~6 g1 Snsamples = 2 * Fs;
5 Q- g4 D0 q! V! P[y2, Fs] = wavread(hfile, nsamples);
& |1 |6 U! ~& ]  ?sound(y2, Fs);
pause(4)
) G+ f% Z. T& M9 H5 O  [
* a& [+ Y9 n$ F5 ]- N+ h" a% Read and play the middle third of the file.
sizeinfo = wavread(hfile, 'size');
5 V' N" V% C' @# U2 L
6 `7 t6 i1 i" d* N' p0 J& \! Itot_samples = sizeinfo(1);
startpos = tot_samples / 3;
) z8 e5 f, z. S+ H9 pendpos = 2 * startpos;

7 p0 f9 W% P" w[y3, Fs] = wavread(hfile, [startpos endpos]);
sound(y3, Fs);

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