Enhanced frequency analysis using wavelets

Wavelets and Time-Frequency Analysis

Time-frequency analysis in power measurement using complex wavelets

The problem of a useful electrical power quantification in environments with power quality problems is discussed. As it is difficult to correctly apply a Fourier-based approach, alternative power quantifications in the time-frequency domain, based on a complex wavelet transform, are presented. Using the property that instantaneous amplitudes of voltages and currents as well as instantaneous pha...

Decrypting English Text Using Enhanced Frequency Analysis

Frequency analysis is the fundamental cryptanalytic technique besides brutal force, threat, blackmail, torture, bribery, etc. [1]. Conventionally, it is applied on monogram, bigram and trigram together with anagramming technique [2]. The efficiency of anagramming depends on the cryptanalyst's depth of knowledge in different language features. Hence anagramming is a trial-and-error approach due ...

High-Dynamic Frequency Tracking Using Wavelets

In this article, we investigate the use of wavelets for frequency tracking in the presence of high dynamics. In particular, we construct automatic frequency control loops that are based on correlating the incoming sinusoidal signal with Fourierbased functions and with Daubechies-4 wavelet functions. Both loops are compared based on their abilities to track an input frequency with varying degree...

Texture analysis using Gabor wavelets

Receptive field profiles of simple cells in the visual cortex have been shown to resemble even-symmetric or odd-symmetric Gabor filters. Computational models employed in the analysis of textures have been motivated by two-dimensional Gabor functions arranged in a multi-channel architecture. More recently Wavelets have emerged as a powerful tool for non-stationary signal analysis capable of enco...