matlab怎么提取音频

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matlab怎么提取音频

madio

使用wavread
. X, _+ \4 a1 P: M# y5 v; wCreate a WAV file from the example file handel.mat,
9 o1 L6 ~2 p& E* k/ I$ s9 xand read portions of the file back into MATLAB.% Create WAV file in current folder.
9 b  e! b6 o  b) F* r* f  U7 sload handel.mat

hfile = 'handel.wav';
; W, b" L% [+ j( |* [/ y6 Q+ _  o5 W) _wavwrite(y, Fs, hfile)
clear y Fs

% Read the data back into MATLAB, and listen to audio.
[y, Fs, nbits, readinfo] = wavread(hfile);
$ X" Y  I, p! |0 c, y! _sound(y, Fs);

. ]/ k& Y5 [% r2 V; Z# q7 O% Pause before next read and playback operation.
- t3 `! R' W" Z9 l/ tduration = numel(y) / Fs;
% E) y8 {: J' u/ ipause(duration + 2)

+ s$ k: ]! n4 e2 b( }- h; e% Read and play only the first 2 seconds.
, h1 \( n7 A5 o3 \3 wnsamples = 2 * Fs;
[y2, Fs] = wavread(hfile, nsamples);
$ j, q: [, l8 C2 \sound(y2, Fs);
pause(4)
+ j. Z% X/ u+ y/ K: T! e* `
1 R1 h6 ]) z7 a( @; m% Read and play the middle third of the file.
* g3 k1 E- x: P9 Vsizeinfo = wavread(hfile, 'size');
& H: z* ~/ X/ W! q/ c
8 `5 f7 s4 B. U4 B' I1 x  R) t% Btot_samples = sizeinfo(1);
' ~* X! W( D& P$ ?4 m) Astartpos = tot_samples / 3;
/ [% i3 C/ @$ D4 i  V- B4 `% l" Fendpos = 2 * startpos;

3 q" y# |% Q) o2 `[y3, Fs] = wavread(hfile, [startpos endpos]);
sound(y3, Fs);

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