Several mel-band-based metrics and a single MFCC-based error metric were evaluated for best correspondence with human discrimination of single tones resynthesized from similar musical instrument time-varying spectra. Results show high levels of correspondence that are very close and often nearly identical to those found previously for harmonic and critical-band error metrics. The number of spec...

It is shown that the dissipative chaotic dynamics of a charged particle in the field of a wave packet with an arbitrary but finite number of harmonics can be reliably suppressed by judiciously varying the constant phase of the main harmonic, φ0, while keeping null the corresponding constant phases of the remaining harmonics. The dependence of the chaotic threshold on the wave packet parameters ...

This paper studies the time-detection properties of an algorithm based on the use of the wavelet-packet transform for the analysis of time-varying harmonics in voltage and current waveforms. The method proposed uses simultaneously different levels of a wavelet decomposition tree to compute the harmonic distortion, in a way compatible with the standards of the IEC, and to detect and to analyze a...

Hilbert Vibration Decomposition (HVD) is introduced to the voltage flicker analysis. When voltage flicker accompanies with high order harmonics, the instantaneous frequency of its analytic signal in principle consists of two different parts, power frequency and a rapidly varying asymmetrical oscillating part. The important property of the instantaneous frequency offers a direct way to estimate ...

This paper deals with the application of the Spectral Kurtosis (SK) to bearing fault detection in asynchronous machines. This one-dimensional spectral measure allows to study the nature of the harmonic components of the stator current of an induction motor running at a constant rotation speed. It provides additional information with respect to second order quantities given by the Power Spectrum...

Conventional add-on feedback filters for mid-frequency (mid-f) repeatable runout (RRO) compensation in a hard disk drive (HDD) servo system either have a long filter transient or constitute a large sensitivity hump and poor stability margins. This paper presents a novel linear time-varying (LTV) group filtering scheme for the compensation of a few mid-f RRO harmonics. While having a short filte...

It has been established that shunt active power filters are suitable for compensating harmonics in the current fed type harmonic producing loads, likewise the series active power filter (APF) are considered to be suitable for voltage fed type harmonics-producing load. This paper discusses the indirect current control approach in terms of its simplicity and effectiveness for the operation of a s...

Due to the advancement in power electronic equipments and increase in the usage of non-linear loads in power distribution system, the undesirable harmonics are introduced that degrade the quality of power. Presence of harmonics are always detrimental to power system that results in irreversible failure of electrical components, sometimes apart from frequently known heating issues in it. There a...

Previous studies have demonstrated that the appearance of an object under varying illumination conditions can be represented by a low-dimensional linear subspace. A set of basis images spanning such a linear subspace can be obtained by applying the principal component analysis (PCA) for a large number of images taken under different lighting conditions. While the approaches based on PCA have be...