|Autors: Nikolova, K. S., Stoyanov, G. K., Kawamata M.|
Title: Low-sensitivity Design and Implementation of Allpass Based Fractional Delay Digital Filters
Keywords: low-sensitivity design, allpass based fractional delay digital filters
Abstract: A low-sensitivity design and implementation of allpass structures based fractional delay (FD) filters is proposed in this paper. It is based on a phase-sensitivity minimization of each individual first- and second-order allpass section in the filter cascade realization depending on its transfer function (TF) poles position. It is shown that the poles of the FD TFs are taking positions not typical for the conventional filters and there is no second-order allpass sections providing low sensitivity for these positions. A new second order allpass section, suitable for such design, is proposed and compared with the other known secondorder sections. The design procedure is verified experimentally. The overall sensitivity of the properly designed FD filter is considerably decreased, permitting thus a severe multiplier coefficient quantization and efficient multiplierless implementation.
1. I. Krstić, S. Nikolić, G. Stančić, P. Lekić, Design of IIR Multiple-Notch Filters with Symmetric Magnitude Responses About Notch Frequencies, Circuits, Systems and Signal Processing, Vol. 37, Issue 12, pp. 5616 - 56361, Dec. 2018. - 2018 - в издания, индексирани в Scopus или Web of Science
Вид: публикация в международен форум, публикация в реферирано издание, индексирана в Scopus и Web of Science