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The new technologies and communications systems are being set up in all areas. It leads to treating data from different sources and for several proposes. But it is necessary to obtain only the information that is required. Digital filters, together with analogue filters, are used for these objectives. The main advantage of the digital filters is that they can be applied at zero cost and with a great flexibility. | DIGITAL FILTERS Edited by Fausto Pedro García Marquez INTECHWEB.ORG Digital Filters Edited by Fausto Pedro García Marquez Published by InTech Janeza Trdine 9 51000 Rijeka Croatia Copyright 2011 InTech All chapters are Open Access articles distributed under the Creative Commons Non Commercial Share Alike Attribution 3.0 license which permits to copy distribute transmit and adapt the work in any medium so long as the original work is properly cited. After this work has been published by InTech authors have the right to republish it in whole or part in any publication of which they are the author and to make other personal use of the work. Any republication referencing or personal use of the work must explicitly identify the original source. Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published articles. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials instructions methods or ideas contained in the book. Publishing Process Manager Katarina Lovrecic Technical Editor Goran Bajac Cover Designer Martina Sirotic Image Copyright Prudkov 2010. Used under license from Shutterstock.com First published March 2011 Printed in India A free online edition of this book is available at www.intechopen.com Additional hard copies can be obtained from orders@intechweb.org Digital Filters Edited by Fausto Pedro García Márquez p. cm. IsBn 978-953-307-190-9 I kfTE LI OPEN ACCESS INI Cvn PUBLISHER INTECH open free online editions of InTech Books and Journals can be found at .