matlab怎么提取音频

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matlab怎么提取音频

madio

使用wavread
. f8 R- C* I4 }4 L8 ?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.
- x* S8 Y0 q4 [3 x$ sload handel.mat

hfile = 'handel.wav';
wavwrite(y, Fs, hfile)
; a8 p" ^0 Z, c) u2 _clear y Fs
9 ?3 d' e5 I" B
8 b( j8 M. m) B% Read the data back into MATLAB, and listen to audio.
[y, Fs, nbits, readinfo] = wavread(hfile);
5 Z4 {0 G/ U5 x2 ]! E' i; @  n9 z% s9 ssound(y, Fs);

9 j# s* Y- v) f6 h% Pause before next read and playback operation.
duration = numel(y) / Fs;
pause(duration + 2)

% Read and play only the first 2 seconds.
0 x* m4 l9 d" a4 w& j0 ?8 x2 r# Fnsamples = 2 * Fs;
# U4 V+ Y$ s# b- Q: H5 b" S[y2, Fs] = wavread(hfile, nsamples);
* g2 S  v# f! h5 b4 w; q6 Esound(y2, Fs);
pause(4)
2 H# i& o$ m% S9 A. J+ u
# }- s& G% `6 w9 O1 y1 B9 B) }% Read and play the middle third of the file.
sizeinfo = wavread(hfile, 'size');
: I' P0 Y" {8 C1 V9 [2 _% n. O
8 v  y8 K$ c3 x3 I3 htot_samples = sizeinfo(1);
startpos = tot_samples / 3;
3 [* H) ?  d! mendpos = 2 * startpos;
& Z4 N! B7 ?$ U
[y3, Fs] = wavread(hfile, [startpos endpos]);
3 O5 |# j' a" ^sound(y3, Fs);

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