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.
( _" y0 r1 z. G0 e0 Pload handel.mat
5 A% [' L) D: u1 f6 b. i: j
3 y$ K  e3 y. j: }/ bhfile = 'handel.wav';
/ ?# I+ C' M8 B+ pwavwrite(y, Fs, hfile)
clear y Fs

& @" ]! e' s0 [* R7 E! Y% Read the data back into MATLAB, and listen to audio.
[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);

% Pause before next read and playback operation.
9 q3 i" T6 V4 _/ S- u5 Nduration = numel(y) / Fs;
pause(duration + 2)

% Read and play only the first 2 seconds.
$ K* [2 W) [8 D5 m+ ]; jnsamples = 2 * Fs;
' C. }$ ?! e& T5 X9 \, t& T4 A, L[y2, Fs] = wavread(hfile, nsamples);
2 }2 b! N: C: ssound(y2, Fs);
pause(4)
( R4 `+ X# k# B: t$ P
% Read and play the middle third of the file.
' n& n7 \& z5 E! M& A8 Y4 \) S/ usizeinfo = wavread(hfile, 'size');
& w6 k% P$ ?9 f" Q" g% y1 Z/ |
3 m) n' }* A- f2 ^$ F) `2 e" z( Ttot_samples = sizeinfo(1);
startpos = tot_samples / 3;
endpos = 2 * startpos;

, s- R  Q/ u( |) L[y3, Fs] = wavread(hfile, [startpos endpos]);
sound(y3, Fs);

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