matlab怎么提取音频

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matlab怎么提取音频

madio

使用wavread
7 I/ m; g$ @. ]: v% ZCreate a WAV file from the example file handel.mat,
8 n" b0 Y; D0 w+ mand read portions of the file back into MATLAB.% Create WAV file in current folder.
load handel.mat

hfile = 'handel.wav';
) s# y+ E$ @% t* [* Owavwrite(y, Fs, hfile)
clear y Fs
: T- j3 U% g+ p# M. W
7 A: i9 V9 w7 W1 k% Read the data back into MATLAB, and listen to audio.
0 z2 S% Y6 z- D1 ^8 y5 f. R! r[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);
/ M# n2 Y% I5 U
% Pause before next read and playback operation.
# l6 V4 @1 z$ m9 l* t; [( Aduration = numel(y) / Fs;
pause(duration + 2)

% Read and play only the first 2 seconds.
nsamples = 2 * Fs;
5 Z- R5 e/ Z9 ?" U6 k[y2, Fs] = wavread(hfile, nsamples);
sound(y2, Fs);
pause(4)
8 z) H1 O# p, P% @$ M
% Read and play the middle third of the file.
% u# \+ Y/ R! f! f8 m0 Bsizeinfo = wavread(hfile, 'size');
7 b9 a2 i7 k9 F6 _
; |0 E6 c# J- o' rtot_samples = sizeinfo(1);
# l8 w  k# L6 o4 m4 R  i+ Bstartpos = tot_samples / 3;
endpos = 2 * startpos;

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

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