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 of your choice.

To save the above de-noised signal, 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 dnoibloc. After saving the signal data to the file dnoibloc.mat, load the variables into your workspace:

• load dnoibloc
  whos
  

Name	Size	Bytes	Class
dnoibloc	1x1024	8192	double array
thrParams	1x5	580	cell array
wname	1x3	6	char array

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

   • wname
     
     wname =
         db1
     

   and the level dependent thresholds are encoded in thrParams, which is a cell array of length 5 (the level of the decomposition). For i from 1 to 5, thrParams{i} contains the lower and upper bounds of the interval of thresholding and the threshold value (since interval dependent thresholds are allowed). For more information, see One-Dimensional Variance Adaptive Thresholding of Wavelet Coefficients.

   For example, for level 1,

   • thrParams{1}
     
     ans =
     
         1.0e+03 *
     
         0.0010 1.0240 0.0041
     

   Here the lower bound is 1, the upper bound is 1024, and the threshold value is 4.1. The total time-interval is not segmented and the procedure does not use the interval dependent thresholds.

One-Dimensional Analysis for De-Noising Using the Graphical Interface

Two-Dimensional Discrete Stationary Wavelet Analysis