oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Design of IIR Filters by Impulse Response Optimisation
M. Novotny,J. Jan
Radioengineering , 1996,
Abstract: The contribution describes a program system to design digital IIR filters by optimisation of impulse response. Besides briefly presenting the already published method, it emphasizes the necessity to regularize the problem by changing the requested impulse response into a causal one by reshuffling its values. The program enables to design the filters starting from either frequency or time domain response and also from a manually prescribed pole configuration which is particularly useful for teaching purposes.
Study and Analysis of Impulse Noise Reduction Filters  [PDF]
Geoffrine Judith.M.C,N.Kumarasabapathy
Signal & Image Processing , 2011,
Abstract: In this paper, a new Decision Based median filtering algorithm is presented for the removal ofimpulse noise from digital images. Here, we replace the impulse noise corrupted pixel by the median of thepixel scanned in four directions.The signal restoration scheme of this filter adapts to the varied impulsenoise ratios while determining an appropriate signal restorer from a reliable neighbourhood. Theexperimental results of this filter applied on various images corrupted with almost all ratios of impulsenoise favour the filter in terms of objectivity and subjectivity than many of the other prominent impulsenoise filters.
On Kalman-Like Finite Impulse Response Filters  [PDF]
Lubin Chang
Computer Science , 2015,
Abstract: This note reveals an explicit relationship between two representative finite impulse response (FIR) filters, i.e. the newly derived and popularized Kalman-Like unbiased FIR filter (UFIR) and the receding horizon Kalman FIR filter (RHKF). It is pointed out that the only difference of the two algorithms lies in the noise statistics ignorance and appropriate initial condition construction strategy in UFIR. The revelation can benefit the performance improvement of one by drawing lessons from the other. Some interesting conclusions have also been drawn and discussed from this revelation.
Finite impulse response digital filters with integer multipliers
Stojanovi? Vidosav,Mini? Sini?a
Serbian Journal of Electrical Engineering , 2003, DOI: 10.2298/sjee0301131s
Abstract: In this paper, a family of non-recursive digital filters will be described in which all multipliers are small integers. It is shown that this practical advantage is only available if some rather severe restrictions on the locations of z-plane poles and zeros are accepted. These restrictions have the further advantage that all filters of the family display pure linear-phase characteristics, imposing a pure transmission delay on all frequency components of an input signal.
Reconstruction of UWB Impulse Train by Parallel Sampling of Cascaded Identical RC Filters  [PDF]
Hannu Olkkonen, Simo Ahtiainen, Kari Jarvinen, Juuso T. Olkkonen
Wireless Engineering and Technology (WET) , 2013, DOI: 10.4236/wet.2013.42011
Abstract:

In this framework we present a new method for measurement of the UWB impulse train based on the parallel sampling of the cascaded identical RC filters. We show that the amplitudes and time locations of p sequential impulses can be reconstructed from simultaneous measurement of the outputs from 2p cascaded identical RC filters. The parallel sampling scheme has a wide range of applications including the detection of the ultra wideband (UWB) impulses. Due to identical analog RC filters and buffer amplifiers, the parallel sampling scheme is flexible to implement in VLSI applications.

New Tools for Analyzing Quark Mixing  [PDF]
Alexander Kusenko
Physics , 1992, DOI: 10.1016/0370-2693(92)90450-I
Abstract: We present some new mathematical tools which help to derive information about the quark mass matrices directly from experimental data and to elucidate the structure of these mass matrices.
Filtering of the Color Images Distorted by Impulse Noise
C. Stupak
Radioengineering , 2001,
Abstract: The paper deals with color image filtering distorted by impulsenoise. The component, transformation, and vector filtering areanalyzed. The filters are evaluated besides the classical criteria(mean absolute error and mean square error), and by the colordifference criterion. Moreover, use of the impulse detectors in thecolor image filtration is analyzed.
MULTISTAGE ADAPTIVE HIGHER-ORDER NONLINEAR FINITE IMPULSE RESPONSE FILTERS FOR CHAOTIC TIME SERIES PREDICTIONS

Zhang Jia-shu,Xiao Xian-ci,

中国物理 B , 2001,
Abstract: A multistage adaptive higher-order nonlinear finite impulse response (MAHONFIR) filter is proposed to predict chaotic time series. Using this approach, we may readily derive the decoupled parallel algorithm for the adaptation of the coefficients of the MAHONFIR filter, to guarantee a more rapid convergence of the adaptive weights to their optimal values. Numerical simulation results show that the MAHONFIR filters proposed here illustrate a very good performance for making an adaptive prediction of chaotic time series.
accuracy: Tools for Accurate and Reliable Statistical Computing  [PDF]
Micah Altman,Jeff Gill,Michael P. McDonald
Journal of Statistical Software , 2007,
Abstract: Most empirical social scientists are surprised that low-level numerical issues in software can have deleterious effects on the estimation process. Statistical analyses that appear to be perfectly successful can be invalidated by concealed numerical problems. We have developed a set of tools, contained in accuracy, a package for R and S-PLUS, to diagnose problems stemming from numerical and measurement error and to improve the accuracy of inferences. The tools included in accuracy include a framework for gauging the computational stability of model results, tools for comparing model results, optimization diagnostics, and tools for collecting entropy for true random numbers generation.
Synthesis, Design and Implementation of Ultra-Wideband Impulse Radio Active Mmic Matched Filters
Jingjing Xia;Choi Look Law;Yuan Zhou
PIER C , 2012, DOI: 10.2528/PIERC11100101
Abstract: In this paper, we present a comprehensive framework from synthesis to implementation of active matched filters for UWB Impulse Radio. The method delays and sums UWB pulses coherently to strengthen the signal over white Gaussian noise. Theoretical analysis shows that the signal peak is maximized against noise, and an arbitrary transfer function could be realized by adjusting filter parameters. To verify the concept, a four-stage matched filter operating in 3-5 GHz with 360 degrees phase delay is demonstrated first. It is implemented in a commercial 2-μm GaAs HBT process and achieves a power gain of 13.8 dB with a 10 dB bandwidth of 1.3 GHz. Based on a similar architecture, another design is presented but with only half of the delay. It has a power gain of 15.9 dB at the center frequency of 4 GHz and a 10 dB bandwidth of 2.3 GHz. An advantage of the proposed method is a precise control of the impulse response that can be matched to either symmetrical or asymmetrical UWB pulses by taking a time domain design approach.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.