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,
; Y( D2 @# c" _7 Band read portions of the file back into MATLAB.% Create WAV file in current folder.
load handel.mat

hfile = 'handel.wav';
2 v6 J8 {' E. c, Awavwrite(y, Fs, hfile)
clear y Fs

! a; d! I6 r( I8 v4 V$ n/ ?7 Y4 t% Read the data back into MATLAB, and listen to audio.
3 _5 s. ]: I' V2 ~3 ?[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);

5 n; A3 R/ b" W% I1 t# ?% Pause before next read and playback operation.
duration = numel(y) / Fs;
/ G; P! n& a  O- X1 \" I' qpause(duration + 2)

* ]. ]- S6 E5 E% Read and play only the first 2 seconds.
nsamples = 2 * Fs;
[y2, Fs] = wavread(hfile, nsamples);
% d3 T# d3 c, {# l6 `7 dsound(y2, Fs);
- O4 V/ W2 m- y! T9 Ypause(4)

8 R/ w. \9 v- U" l4 J0 O% W% Read and play the middle third of the file.
+ ?- L6 G9 b9 p! A8 B3 c4 Gsizeinfo = wavread(hfile, 'size');

% G$ j) t1 Y$ U5 H2 o( a. I0 Itot_samples = sizeinfo(1);
* V" y2 q, C2 I$ ?startpos = tot_samples / 3;
endpos = 2 * startpos;

[y3, Fs] = wavread(hfile, [startpos endpos]);
1 h8 i4 }% X  |1 @0 `sound(y3, Fs);

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