Extraction frequencies

Information Extraction with Term Frequencies

Signal decomposition and analysis via extraction of frequencies

Time–frequency analysis is central to signal processing, with standard adaptation to higher dimensions for imaging applications, and beyond. However, although the theory, methods, and algorithms for stationary signals are well developed, mathematical analysis of non-stationary signals is almost nonexistent. For a real-valued signal defined on the time–domain R, a classical approach to compute i...

Asymptotic wavelet and Gabor analysis: Extraction of instantaneous frequencies

We investigate the behaviour of the continuous wavelet and Gabor coefficients in the asymptotic limit, using stationary phase approximations. In particular, we show how, under some additional assumptions, these coefficients allow the extraction of some characteristics of the analysed signal, like for example frequency and amplitude modulation laws. We also briefly discuss applications to spectr...

Extraction of Ontology Concepts Based on Word Frequencies

A tool for extracting potential ontology concepts from a domain-specific corpus was built. The tool compares word frequencies in the domain-specific corpus with a balanced reference corpus by employing a χ test and relative frequency ratios. It is concluded that the χ measure fails to identify domain-specific terms “on its own”, but can be supported by the relative frequency ratio to increase t...

Allele Frequencies and Genotype Frequencies