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.

8. To save the present de-noised signal, use the menu option File==>Save 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

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" on page 2-143.

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