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They do mean the pseudo-frequency of the wavelet which is not dependent on the signal being analyzed. The misleading terminology that they use seems to come from from one of the references, Han, P. (2013), Investigation of ULF seismo-magnetic phenomena in Kanto, Japan during 2000–2010, PhD thesis, Chiba University, Chiba, Japan. Quoting an article of a ...


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Circular convolution can be done using FFTs, which is a O(NLogN) algorithm, instead of the more transparent O(N^2) linear convolution algorithms. So the application of circular convolution can be a lot faster for some uses. However, with a tiny amount of post processing, a sufficiently zero-padded circular convolution can produce the same result as a ...


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When you want to perform a time-domain linear convolution using a transform (Fourier, trigonometric) domain multiplication technique, then the concept of circular convolution arise. Because the effect of transform-domain multiplication on the time-domain is a circular convolution. Therefore a linear convolution is actually implemented by an underneath ...


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