Distortion Reduction in Fractional Delay Filters

Zhou, Zijian, Yang, Yuli, Ma, Meng and Jiao, Bingli (2021) Distortion Reduction in Fractional Delay Filters. IEEE Signal Processing Letters, 28 . pp. 588-592. ISSN 1070-9908

Full content URL: https://doi.org/10.1109/LSP.2021.3064499

Distortion Reduction in Fractional Delay Filters
Authors' Accepted Manuscript
SPL-29828-2021.pdf - Whole Document

Item Type:Article
Item Status:Live Archive


As the digital version of a continuous-time delay, the concept of fractional delay (FD) is exploited to approximate a desired delay that is not a multiple of the sampling interval. However, in FD filters, there is always a severe distortion at the beginning of delayed signals, referred to as head distortion. This letter identifies the cause of head distortion and proposes a solution to this problem for reducing the overall distortion in FD filters. For the purpose of performance evaluation, relative root-mean-square (RMS) error is formulated as a metric to quantify the overall difference between the frequency-domain response of an FD filter and the ideal one. Moreover, illustrative numerical results on the proposed scheme applied in FD filters with classical sinc, Farrow and Lagrange interpolation substantiate the validity and feasibility of our solution.

Keywords:Fractional delay filters, Head distortion, Sinc interpolation, Farrow structure, Lagrange interpolation
Subjects:H Engineering > H641 Telecommunications Engineering
H Engineering > H600 Electronic and Electrical Engineering
Divisions:College of Science > School of Engineering
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ID Code:44197
Deposited On:30 Mar 2021 11:07

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