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,
8 d6 B& Y" X! F2 p. hand read portions of the file back into MATLAB.% Create WAV file in current folder.
  R! V* _& D% Q# m0 o! H$ jload handel.mat

hfile = 'handel.wav';
wavwrite(y, Fs, hfile)
clear y Fs
; w* z/ P0 o# e5 A# e8 @
5 o  }' X  H& a4 a4 v/ V: W  A% Read the data back into MATLAB, and listen to audio.
9 R+ Q$ }3 y  I: _1 E[y, Fs, nbits, readinfo] = wavread(hfile);
$ B4 f6 L& e4 j  j  v+ s( V/ X$ {sound(y, Fs);

% Pause before next read and playback operation.
! {* ^, L$ C/ v) ~6 `/ _: aduration = numel(y) / Fs;
3 r  X- m. ]6 N8 S6 e( n( O0 }: ipause(duration + 2)

6 o' N4 ?( [$ k5 t) }# L9 J% Read and play only the first 2 seconds.
  _) t. {5 e4 t0 n" s  Q/ Ensamples = 2 * Fs;
: Q3 |% b- M2 p/ w$ M1 ][y2, Fs] = wavread(hfile, nsamples);
0 d  f; T5 V  e! h, esound(y2, Fs);
7 ?* \0 O& {5 E- `: z* v) h2 kpause(4)

% Read and play the middle third of the file.
/ o# r  p7 O. o6 {* fsizeinfo = wavread(hfile, 'size');

tot_samples = sizeinfo(1);
! Z* E0 K5 P1 z( ]( |) h' zstartpos = tot_samples / 3;
. R. c2 D# f% Z0 qendpos = 2 * startpos;

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

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