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标题: matlab怎么提取音频 [打印本页]

作者: ﹏便是晴天ヾ    时间: 2013-11-6 21:05
标题: matlab怎么提取音频
matlab怎么提取音频
作者: madio    时间: 2013-11-7 10:11
使用wavread+ ~' M/ L$ J2 n6 ]/ \
Create a WAV file from the example file handel.mat,, M/ U: R5 l8 B+ ^
and read portions of the file back into MATLAB.% Create WAV file in current folder.
! {: N* l6 t3 U! F" V' hload handel.mat
% M' Y. j) h# G& X * Q. |* {1 N# e* s! i0 @
hfile = 'handel.wav';
7 J6 m! R6 d  g4 ^wavwrite(y, Fs, hfile)! s& R8 f% ]7 S- [% ^- W! d3 K9 l
clear y Fs
1 v# }4 k1 y9 B2 d- s 9 K7 `2 U) V- ]  p7 I
% Read the data back into MATLAB, and listen to audio.
4 h( E! l$ I. S! n7 w0 E. N[y, Fs, nbits, readinfo] = wavread(hfile);' [) F! I3 }: a3 {
sound(y, Fs);
2 S. I; N' z5 G& _9 e
5 q1 U' o/ Q# v6 x) l% Pause before next read and playback operation.6 k* F" O$ I; Q7 t9 d, e) T  _
duration = numel(y) / Fs;
/ {( X, P& Q! @; T& T2 u) lpause(duration + 2)2 r6 d: r0 k& p# K9 ^

5 {2 l) s' j  ?: `9 c& X* c# E$ K( ~% Read and play only the first 2 seconds.
  _: [2 d1 U" `- @- wnsamples = 2 * Fs;! p3 |' q- [  x4 G  v
[y2, Fs] = wavread(hfile, nsamples);
( X# V5 f8 f1 T; Osound(y2, Fs);
' p- G8 F: q' g( F; r' Dpause(4)
0 b8 O: R7 W* C0 K : x& R! t1 f8 w
% Read and play the middle third of the file.6 Y/ H9 R7 v3 k& n
sizeinfo = wavread(hfile, 'size');
! Y5 w# j, ]1 h1 l 8 `# c2 R* N1 M6 }
tot_samples = sizeinfo(1);
9 B. y4 |! F8 [3 K$ E; lstartpos = tot_samples / 3;
5 \9 k. \  {+ U5 Fendpos = 2 * startpos;4 h: Y" r: r" W/ U

+ P5 L8 V8 d2 Z" D$ V  S0 ^[y3, Fs] = wavread(hfile, [startpos endpos]);
0 o9 \3 B+ h$ u/ r. t! T- F$ Esound(y3, Fs);
作者: 陌上,烟雨遥    时间: 2013-12-12 09:54





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