wavelet scale to frequency

[Mads]

Using the easy continous wavelet transform I get a scalogram. I need the frequency of a peak found in the scalogram and so the question is; how do I know how to convert from scale to frequency? I know they are inversly proporsional.

Using Morlet and known signals with the sampling rate set to 4096000 S/sec I found that you have the approximate relation:

frequency = 3000000/scale

If I double the sample rate the number is approx. 6000000. But where exactly does the (approx.) number come from? It seems the value is 0,73 of the sampling rate, and it's independent of the number of samples.

(I'm using wavelet instead of stfft to get better resolution).

[Zvezdana S.]

Mads,
Here is a VI that performs the time-frequency analysis as well as the traditional time-scale analysis. You don't need to manually convert scale to frequency. The attached is the Analytic Wavelet Transform package with an example. The VI should be run with the SPT 7.
Zvezdana S.