Digital All-Pass Filter Modeling Based on Desired Group Delay Using Advanced Material: A Review on the Signal Processing Part

Faizah Abu Bakar; Sohiful Anuar Zainol Murad; Rizalafande Ismail; Muzamir Isa

doi:10.4028/www.scientific.net/AMM.815.338

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 815Digital All-Pass Filter Modeling Based on Desired...

Digital All-Pass Filter Modeling Based on Desired Group Delay Using Advanced Material: A Review on the Signal Processing Part

Abstract:

This paper presents a review on three types of techniques in designing digital all-pass filters based on group delay. All the three methods use the same basic concept rooting back to the requirement of a stable transfer function of the filter which should be a minimum-phase type, and the denominator group delay. The most optimized of the three is chosen to be implemented in MATLAB in order to decrease the group delay variation of a 5^th order Chebyshev low-pass filter with cut-off frequency of 160 MHz. The digital transfer function of the low-pass filter is obtained from the analog transfer function by means of bilinear transformation. The sampling frequency of the digital LPF is 100 times the cut-off ffrequency to retain the response of the analog LPF. Both of the filters are then cascaded together and the overall group delays variations are analyzed. The variations of group delay shows a reduction but the price paid is the increase of the overall group delay of the system.

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Periodical:

Applied Mechanics and Materials (Volume 815)

Pages:

338-342

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.815.338

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Online since:

November 2015

Authors:

Faizah Abu Bakar, Sohiful Anuar Zainol Murad, Rizalafande Ismail, Muzamir Isa

Keywords:

Digital All-Pass Filter, Digital All-Pass Filter Design Methods, Group Delay, Group Delay Variation

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