Minimum Phase Property of Chebyshev-Sharpened Cosine Filters

Miriam Guadalupe Cruz Jiménez, David Ernesto Troncoso Romero and Gordana Jovanovic Dolecek

Mathematical Problems in Engineering, 2015, vol. 2015, 1-14

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.

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jnlmpe:936958

DOI: 10.1155/2015/936958

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