Bessel filter

About: Bessel filter is a research topic. Over the lifetime, 656 publications have been published within this topic receiving 16808 citations.

Comparative analysis of different filters in power line harmonic reduction

Abstract: Harmonics are injected in power system due to frequent switching and enormous usage of nonlinear loads. As a consequence, harmonic contamination in power system signals is a matter of major anxiety to electrical engineers. Fast Fourier Transform (FFT) has been adopted as an analytical tool for signal processing purpose. Single phase voltage signal is chosen from a three phase supply sent to motor. Here, power analyzer interfaced with laptop is an arrangement used as data acquisition unit. Obtained wave data of single phase voltage signal is processed through the FFT program in MATLAB. Then, simulation of the voltage signal procured from data acquisition unit is designed in SIMULINK. After that, the simulated signal is filtered by Butterworth filter, Bessel filter and Chebyshev 1 filter to diminish Total Harmonic Distortion (THD) from the output after filtration. THD value is scaled down from 9.08% to 5.40%.

Design, development and Comparative performance analysis of Bessel and Butterworth filter for Nadi Pariksha yantra

Abstract: Nadi pariksha is a very ancient Indian system of Ayurvedic medicine which uses pulse signal from radial artery as means for diagnosis of diseases. It assists the Ayurvedic practitioners in routine diagnostic procedure. This paper presents experimental work in the design of pre-processing module in the Nadi pariksha yantra. Spectral analysis of Tridosha signals and Comparative analysis of Butterworth and Bessel filter has been presented. 8th order Bessel filter retains periodicity and reduces ringing and overshooting effects of the Tridosha signals. Spectral analysis has been implemented to identify the cut-off frequency of acquired Tridosha signal using NI LabVIEW.

Method of synthesis of phase-correcting networks

Abstract: A method is presented for determining the transfer functions of phase-corrective networks of both minimum-phase and all-pass types. The method is based on manipulation of a class of polynomials containing one or more variable parameters, which is derived from Bessel polynomials and represents basically an extension of the application of Bessel polynomials and related Bessel functions to solving the problem of approximation to the ideal constant-group-delay characteristic. Some simple phase-correcting networks, useful in those applications where the phase distortion occurs mainly at high frequencies, are first discussed, and the formulas and graphs for the evaluation of their group-delay responses are given. The extension of the method to allow for determination of the transfer function of the correcting network matching a prescribed phase characteristic is then presented. Both maximally fiat and equal-ripple types of approximation are considered, and explicit formulas for the evaluation of the coefficients of transfer functions of order n<6 are derived. The conditions on which the order of equalisation can be increased without affecting the complexity of the correcting network are also stated explicitly.

Note on Maximally Flat Delay Networks

Abstract: A general solution in closed form is given for the reflection coefficient of a network with transfer function equal to the reciprocal of an n th degree Bessel polynomial. The result is applicable to a Darlington-type synthesis of a maximally flat delay network with unequal resistance terminations.

Computation of bessel functions of complex argument using their zeros

Abstract: A method for calculating values of Bessel functions of the first kind Jv (z) is described, which requires only a knowledge of their zeros in order to evaluate a simple analytic formula. A simple error formula is derived and its behaviour as a function of z and v are described. Numerical examples of the error involved in approximating Jv (z) for and v=0,1 are given.