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,
, Z3 Z. o( x" d# d0 {" D. Uand read portions of the file back into MATLAB.% Create WAV file in current folder.
load handel.mat
. y# R% X& ^, o5 e* N0 ~* j8 m3 \2 ~
hfile = 'handel.wav';
wavwrite(y, Fs, hfile)
clear y Fs

% Read the data back into MATLAB, and listen to audio.
[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);

% U" H  k! @! J3 a% Pause before next read and playback operation.
; J. X: V6 S' j6 Fduration = numel(y) / Fs;
pause(duration + 2)

% B0 \0 a% K3 `9 g+ F2 a- v: ?  z% Read and play only the first 2 seconds.
; H# n7 |& F* N: ~7 J7 T5 R, Q6 f* f, rnsamples = 2 * Fs;
3 _) {4 Y8 A. Q  Y  Z( ?5 ?[y2, Fs] = wavread(hfile, nsamples);
7 q- Y9 Y" w4 i; a% k& {sound(y2, Fs);
+ c& b! x8 l' U/ u  O( o8 Gpause(4)

: S9 |6 _$ `4 M& m: U. a) v% Read and play the middle third of the file.
( ^* _) k% v, Zsizeinfo = wavread(hfile, 'size');
$ ~7 i! D8 t1 W4 t5 W3 Q, }
tot_samples = sizeinfo(1);
startpos = tot_samples / 3;
endpos = 2 * startpos;
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( Y7 w( C$ I& I8 l2 u# K' [! U[y3, Fs] = wavread(hfile, [startpos endpos]);
8 U  Y: k9 k% z# L+ c7 t6 ?, `5 |, Nsound(y3, Fs);

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