Wavelet Toolbox

Importing and Exporting Information from the Graphical Interface

The tool lets you save the de-noised signal to disk. The toolbox creates a MAT-file in the current directory with a name you choose.

To save the de-noised signal from the present de-noising process, use the menu option FileSave De-noised Signal. A dialog box appears that lets you specify a directory and filename for storing the signal. Type the name dnelec. After saving the signal data to the file dnelec.mat, load the variables into your workspace:

• load dnelec 
  whos
  

Name	Size	Bytes	Class
dnelec	1x2000	16000	double array
thrParams	1x4	656	cell array
wname	1x4	8	char array

The de-noised signal is given by dnelec. In addition, the parameters of the de-noising process are given by the wavelet name contained in wname:

• wname
  
  wname =
      haar
  

and the level dependent thresholds contained in thrParams, which is a cell array of length 4 (the level of the decomposition). For i from 1 to 4, thrParams{i} is an array nbintx3 (where nbint is the number of intervals, here 3), and each row contains the lower and upper bounds of the interval of thresholding and the threshold value. For example, for level 1,

• thrParams{1}
  ans =
      1.0e+03 *
  
      0.0010 0.0980 0.0060
      0.0980 1.1240 0.0204
      1.1240 2.0000 0.0049
  

One-Dimensional Local Thresholding for De-noising Using the Graphical Interface

One-Dimensional Selection of Wavelet Coefficients Using the Graphical Interface