matlab怎么提取音频

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matlab怎么提取音频

madio

使用wavread
5 h+ W' c" M  A" Y1 R/ ]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.
' k) k7 a) z% T  D- uload handel.mat

, R3 i- b' e, I' Q4 s% U+ w" Yhfile = 'handel.wav';
/ t( V2 @2 `- b/ s! Kwavwrite(y, Fs, hfile)
clear y Fs

$ a- M/ w* E6 r7 r: D& ~3 K, o* E% Read the data back into MATLAB, and listen to audio.
[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);
. B% O! p5 p* ~
: R3 z. l' M- o& e# Q% Pause before next read and playback operation.
7 ~* ?; N" S& }, i' c. `$ Yduration = numel(y) / Fs;
9 [& a" v) ~3 a( ^. rpause(duration + 2)
) m- r4 r) E* J4 C. `
" c7 g- B* Y: D2 m, [% Read and play only the first 2 seconds.
% F% C9 g! [7 p# H1 @nsamples = 2 * Fs;
% {( {6 N' g( @/ [- G4 u[y2, Fs] = wavread(hfile, nsamples);
sound(y2, Fs);
$ d) b  \8 J/ L4 E; f% d4 Kpause(4)
% Q! B  d7 m3 n& z
% Read and play the middle third of the file.
' ^* z6 I, e! g0 Q; u: Xsizeinfo = wavread(hfile, 'size');

tot_samples = sizeinfo(1);
" U7 N5 i0 z  G" vstartpos = tot_samples / 3;
9 T6 [/ R6 `" J1 ]; r0 ~5 j3 |endpos = 2 * startpos;

7 Q9 t/ T  b$ }) B' O6 v6 A' m[y3, Fs] = wavread(hfile, [startpos endpos]);
sound(y3, Fs);

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