even scale—The VI computes the continuous wavelet transform at positive integer scales 1, 2, 3, ..., scales.

[liupingnuaa]

Does anybody have experience on wavelet analysis? Can you explain a control called "scale sampling method" in "WA Analytic Wavelet Transform (waveform).VI "? I cannot understand the meaning "even scale—The VI computes the continuous wavelet transform at positive integer scales 1, 2, 3, ..., scales." Thanks !    

[muks]

scale sampling method specifies the method to use to select the scales of the wavelets. scale sampling method affects the mapping style of the y-axis of the scalogram. Use the user defined scales input to specify a customized scale.

0	even frequency (default)—The center frequencies of the wavelets at the analyzed scales have evenly sampled the frequency range from 0 to fs/2. The central frequency of a wavelet is inversely proportional to the scale. The resulting scalogram is a kind of joint time-frequency representation with an adaptive time-frequency resolution.
1	even scale—The VI computes the continuous wavelet transform (CWT) at positive integer scales 1, 2, 3, ..., scales.

Message Edited by muks on 11-04-2009 01:21 PM

[sergh]

I am trying to measure the exact amplitude of the signal components after AWT.

In "Labview_Advanced Signal Processing Toolkit.pdf" it says the following (p. 3-11):

>> ...With the WA Analytic Wavelet Transform VI, you can analyze a signal
based on amplitude normalization by selecting amplitude in the
normalization list. If you set scale sampling method to even freq and set
normalization to amplitude, the WA Analytic Wavelet Transform VI
generates the scalogram of the HypChirps signal, as shown in Figure 3-12...>>

As far, as I get it at the output instead of the Energy-preserved signal, one should obtain the Amplitude-preserved signal. This was, unfortunately, not the case (see Source: AWT_Uniform-Amplitude-Respo.gif in Attach.). I am trying to build some kind of graph surface, like in AWT-Surface.gif (see Attach.)

Am I missing smthing and is it possible at all to read the exact amplitudes of the signal components corresponding to those in Time domain?

Thx.