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.
load handel.mat
2 ?# z3 S( r; V% `8 \% W; @1 N# ?
hfile = 'handel.wav';
wavwrite(y, Fs, hfile)
clear y Fs

% Read the data back into MATLAB, and listen to audio.
) \4 z1 {7 f0 ^2 R2 J- a6 l: }[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);
& R+ X: T% y( @% i$ R" V) |$ h
% Pause before next read and playback operation.
duration = numel(y) / Fs;
pause(duration + 2)

% Read and play only the first 2 seconds.
/ o* \3 [2 A/ }- t1 dnsamples = 2 * Fs;
[y2, Fs] = wavread(hfile, nsamples);
sound(y2, Fs);
% p; J. f% I; p1 t+ N& C- M/ K* tpause(4)

$ o0 \7 T2 R2 R5 V6 i3 E: B% ~) f% Read and play the middle third of the file.
sizeinfo = wavread(hfile, 'size');
% f8 l: @+ H7 O& U
2 F3 f2 S4 }* y) v' vtot_samples = sizeinfo(1);
3 ^- m- |- J6 Q; e, E( |. ~. ]1 jstartpos = tot_samples / 3;
endpos = 2 * startpos;

2 t/ E9 r, x( ^0 n- I[y3, Fs] = wavread(hfile, [startpos endpos]);
sound(y3, Fs);

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