matlab怎么提取音频

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matlab怎么提取音频

madio

使用wavread
+ Q- q% w3 j4 }0 U  I- UCreate a WAV file from the example file handel.mat,
and read portions of the file back into MATLAB.% Create WAV file in current folder.
  l8 j3 D8 T# @4 b1 X* F# D2 |load handel.mat

) k  J# d" h% H4 }% n' e4 Rhfile = 'handel.wav';
wavwrite(y, Fs, hfile)
7 s5 M+ ~5 ^* _, M7 gclear y Fs
# c& W+ ^  W" I% ]1 i
% Read the data back into MATLAB, and listen to audio.
$ h/ Y0 j2 \/ h% O8 {; I/ z0 N! q[y, Fs, nbits, readinfo] = wavread(hfile);
sound(y, Fs);

% Pause before next read and playback operation.
duration = numel(y) / Fs;
; M+ D. O! ^( }8 a% g; n  A/ e* U7 upause(duration + 2)
9 s# L- ?7 g( Q7 E% W5 a
5 G7 R$ |* \% ~2 W% Read and play only the first 2 seconds.
( F0 H: ?  H2 k$ }& Bnsamples = 2 * Fs;
2 N9 J  ~0 G+ n6 f7 K6 N6 p2 _. P[y2, Fs] = wavread(hfile, nsamples);
( F5 x4 U  [0 I7 C1 Osound(y2, Fs);
3 G; _: y" j) l9 K( epause(4)
" k* ^2 T/ d+ ]0 C* M2 `1 a
% Read and play the middle third of the file.
sizeinfo = wavread(hfile, 'size');

' x% ?5 K- W+ d# @, z% l4 Q% jtot_samples = sizeinfo(1);
startpos = tot_samples / 3;
8 Z$ x. Y" K1 N) x8 b6 ~/ t8 eendpos = 2 * startpos;

* X. Y+ y; H. L# _[y3, Fs] = wavread(hfile, [startpos endpos]);
sound(y3, Fs);

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