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Mathematical Problems in Engineering
Volume 2015, Article ID 936958, 14 pages
http://dx.doi.org/10.1155/2015/936958
Research Article

Minimum Phase Property of Chebyshev-Sharpened Cosine Filters

1Department of Electronics, INAOE, 72840 Tonantzintla, PUE, Mexico
2Cátedras-CONACYT, ESCOM-IPN, 07738 Mexico City, DF, Mexico

Received 27 May 2014; Accepted 12 January 2015

Academic Editor: Changchun Hua

Copyright © 2015 Miriam Guadalupe Cruz Jiménez et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We prove that the Chebyshev sharpening technique, recently introduced in literature, provides filters with a Minimum Phase (MP) characteristic when it is applied to cosine filters. Additionally, we demonstrate that cascaded expanded Chebyshev-Sharpened Cosine Filters (CSCFs) are also MP filters, and we show that they achieve a lower group delay for similar magnitude characteristics in comparison with traditional cascaded expanded cosine filters. The importance of the characteristics of cascaded expanded CSCFs is also elaborated. The developed examples show improvements in the group delay ranged from 23% to 47% at the cost of a slight increase of usage of hardware resources. For an application of a low-delay decimation filter, the proposed scheme exhibits a 24% lower group delay, with 35% less computational complexity (estimated in Additions per Output Sample) and slightly less usage of hardware elements.