A recurring problem regarding the use of conventional comb filter approaches for elimination of periodic waveforms is the degree of selectivity achieved by the filtering process. Some applications, such as the gradient artefact correction in EEG recordings during coregistered EEG-fMRI, require a highly selective comb filtering that provides effective attenuation in the stopbands and gain close ...

This paper presents a comparison between piezoelectric filtering and passive LC integrated into an HF class L?Piezo inverter. inverter is variant of ?2 where the second harmonic carried out by resonator. Piezoelectric filters are well known in signal domain (RF filtering), but their use field power electronics, as temporary energy storage element, rather recent. In piezoelectricity has mainly b...

This work proposes a quasi-passive reconfigurable complex filter with harmonic rejection based on N-path filtering technique. It features extremely low power consumption and center frequencies. Unlike the traditional filters at RF frequencies, proposed achieves 3rd/5th adjacent frequencies by cascading different clock The is implemented in 55nm CMOS technology, consumes an area of 0.24mm2 inclu...

In this paper, we present an optimal filter for the enhancement or estimation of signals on the 2-sphere corrupted by noise, when both the signal and noise are realizations of anisotropic processes on the 2-sphere. The estimation of such a signal in the spatial or spectral domain separately can be shown to be inadequate. Therefore, we develop an optimal filter in the joint spatio-spectral domai...

A current challenging topic in mathematical morphology is the construction of locally adaptive operators; i.e., structuring functions are dependent on the input image itself at each position. Development of spatially-variant filtering is well established in the theory and practice of Gaussian filtering. The aim of the first part of the paper is to study how to generalize these convolutionbased ...

Periodicity pitch is the most salient and important of all pitch percepts. Psychoacoustical models of this percept have long postulated the existence of internalized harmonic templates against which incoming resolved spectra can be compared, and pitch determined according to the best matching templates [J. Goldstein, J. Acoust. Soc. Am. 54, 1496-1516 (1973)]. However, it has been a mystery wher...

We present a framework for the optimal filtering of spherical signals contaminated by realizations an additive, zero-mean, uncorrelated and anisotropic noise process on sphere. Filtering is performed in wavelet domain given scale-discretized transform The proposed filter sense that it minimizes mean square error between filtered representation noise-free signal. also simplified formulation case...

The use of medians as filtering windows in digital signal processing is known since many years and applied especially when linear filters could not be used, because of specific character of disturbances which are to be removed. This is the case, if, for instance, impulsive disturbances, having very wide spectra, are observed, and linear filters are not suitable for their elimination. Median pro...

In power systems, protective relays must filter their inputs to remove undesirable quantities and retain signal quantities of interest. This job must be performed accurate and fast. A new method for filtering the undesirable components such as DC and harmonic components associated with the fundamental system signals. The method is s based on a dynamic filtering algorithm. The filtering algorith...

Pure-tone song is a common and widespread phenomenon in birds. The mechanistic origin of this type of phonation has been the subject of long-standing discussion. Currently, there are three hypotheses. (i) A vibrating valve in the avian vocal organ, the syrinx, generates a multifrequency harmonic source sound, which is filtered to a pure tone by a vocal tract filter ("source-filter" model, analo...