Fundamental component estimation, including its phase and amplitude information along with instantaneous fundamental symmetrical components, is of great importance for grid connected power electronics converters control, namely in power conditioning applications such as Dynamic Voltage Restorers (DVRs) and Unified Power Flow Controllers (UPFCs). Several methods have been proposed to estimate th...

The dynamics of human electroencephalography (EEG) have been proved to be related to cognitive activities. This study separately assessed the two EEG components, amplitude and rhythm, aiming to capture their individual contributions to cognitive functions. We extracted the local peaks of EEGs under rest or photic stimulation and calculated the symbolic dynamics of their voltages (amplitude) and...

2 Time-Frequency Distribution A novel technique for filtering a real signal is preIF Estimation sented. The method is based upon encoding the signal as an instantaneous frequency (IF) and using IF analysis techniques to recover a filtered version of it. A general iterative time-frequency peak filtering (TFPF) scheme based on this method is formulated. Simulations are given which show extremely ...

Time-frequency reassignment is a relatively old but under-explored method for time frequency analysis. This report reviews previous research on reassignment and relates it to instantaneous frequency in an explicit and novel way. New measures based on reassignment of the amplitude spectrum, as opposed to the traditional phase spectrum, are proposed and analysed. The statistical properties of rea...

The paper describes algorithm for the classification of digital modulations and testing of this algorithm with disturbed signals. 2ASK, 2FSK, 4FSK, MSK, BPSK, QPSK, 8PSK and 16QAM were chosen for recognition as the best-known digital modulations used in modern communication technologies. The algorithm is based on the evaluation of spectral power density of the normalized-centered instantaneous ...

A class of time-frequency distributions with complex-lag argument is proposed. It is based on the ambiguity domain representations of real and complex lag moment, combined to provide a cross-terms free representation for multicomponent signals. Furthermore, the distributions from the proposed class provide a more effective instantaneous frequency estimation for signals with fast varying phase f...

Length frequency data of the longtail tuna, Thunnus tonggol collected from October 2006 to September 2007 were analyzed for evaluation of the stock parameters. T. tonggol is mainly caught by gillnet method. Yearly tuna and tuna-like catches in Iran are of the order of 174,234 mt, close to 46% of which are longtail tuna. The VBG parameters for longtail tuna were: L∞ =133.72cm K=0.35 year−1.The l...

Periodicity is commonly found in many physical phenomena. This paper describes the notion of instantaneous frequency amplitude spectrum (IFAS) which originally developed in the context of time-frequency signal analysis. The IFAS provides better the harmonic structure representation of speech signal than the short time Fourier transform (STFT) amplitude spectrum. We define harmonicity measure as...

The electroencephalogram (EEG), used to noninvasively monitor brain activity, remains the most reliable tool in the diagnosis of neonatal seizures. Due to their nonstationary and multi-component nature, newborn EEG seizures are better represented in the joint time–frequency domain than in either the time domain or the frequency domain. Characterising newborn EEG seizure nonstationarities helps ...