The main purpose of the paper is to contribute at presenting a formalism which would be relevant for interpreting qualitatively the nonlinear harmonic distortion, and more particularly the strong intermodulation, which occur in air in the frequency range (20 Hz-20 kHz) when the vawe is propagating. For that purpose, the one-dimensional nonlinear acoustic propagation in infinite medium of two ha...

Lecturer, Department Of Electrical Engineering, L. E. College Morbi-363642, India, ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract -This paper presents application of flying capacitor multi level inverter in high voltage shunt active power filter. The proposed strategy uses three independent mul...

t AbstractLeast-squares' sine-fit algorithms are used extensively in signal-processing applications. The parameter estimates produced by such algorithms are subject to both random and systematic errors when the record of input samples consists of a fundamental sine wave corrupted by harmonic distortion or noise. The errors occur because, in general, such sine-fits will incorporate a portion of ...

Full waveform inversion (FWI) has been used to successfully build high-resolution earth velocity models for marine data. For land data sets, FWI using acoustic wave equation (acoustic-FWI) remains challenging due to the lack of modeling of strong surface waves, converted waves, phase dispersion, and near-surface weathering layer distortion. In addition, for land dynamite surveys, the source wav...

Introduction:  Image  distortion  is  one  of  the  major  problems  of  magnetic  resonance  imaging  (MRI) for use in 3DMRI, velocity MRI, FMRI and radiotherapy treatment planning (RTTP). It is  widely known that the most obvious effect of the inhomogenity of the magnetic fields and the  nonlinearity  of  the  gradient  is  the  Geometric  Distortion  of  MR  tomograms.  In  this  study,  the...

Aerial image is one of the primary data sources for underwater oceanographic studies. These images are often corrupted by clutters induced by surface water waves. Removal of the wave clutters from these images is an important preprocessing step for accurate assessment of information. In this paper, we introduce a novel technique combining the X-ray wavelet transform (XWT) with Markov random fie...

The wavefront measurement technique using the Shack Hartmann wavefront sensor has been developed for measurement of wavefront distortion of a SR extraction mirror for the beam profile monitor at Photon Factory. The instrument consists of a multi-lens array ( 8x8 array, 250 mm pitch and focal length of 4.5 mm), a beam expander (20:1), an image relay lens system (1:1), a HeNe laser (633 nm) and a...

This paper presents a full-bridge discrete power output stage for a Class D audio amplifier using a single-ended power supply. The circuit receives a digital control signal with 5 V of amplitude and it generates a floating differential output voltage up to 20 V of amplitude from a single 20 V power supply voltage. Using as control signal a pulse density modulation (PDM) wave generated by an opt...