A Synthesis of Variable IIR Digital Filters
Summary :
It is sometimes required to change the frequency characteristics of a digital filter during its operation. In this paper a new synthesis of variable even-order IIR digital filters is proposed. The cut-off frequency of the filter can be changed by a single parameter. The fundamental filter structure is a cascade of second-order sections. The multiplier coefficients of each section are determined by using the Taylor series expansion of the lowpass to lowpass frequency transformation. For this method any second-order section can be used as a prototype, but here in this paper only the direct form and the lattice form are described. Unlike the conventional method, any transfer functions can be used for the proposed method. Finally a designed example shows that the proposed filter has wider tuning range than the conventional filter, and the advantage of the proposed filters is confirmed.
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- IEICE TRANSACTIONS on Fundamentals Vol.E75-A No.3 pp.362-368
- Publication Date
- 1992/03/25
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- Special Section PAPER (Special Section on the 4th Karuizawa Workshop on Circuits and Systems)
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Nobuo MURAKOSHI, Eiji WATANABE, Akinori NISHIHARA, "A Synthesis of Variable IIR Digital Filters" in IEICE TRANSACTIONS on Fundamentals,
vol. E75-A, no. 3, pp. 362-368, March 1992, doi: .
Abstract: It is sometimes required to change the frequency characteristics of a digital filter during its operation. In this paper a new synthesis of variable even-order IIR digital filters is proposed. The cut-off frequency of the filter can be changed by a single parameter. The fundamental filter structure is a cascade of second-order sections. The multiplier coefficients of each section are determined by using the Taylor series expansion of the lowpass to lowpass frequency transformation. For this method any second-order section can be used as a prototype, but here in this paper only the direct form and the lattice form are described. Unlike the conventional method, any transfer functions can be used for the proposed method. Finally a designed example shows that the proposed filter has wider tuning range than the conventional filter, and the advantage of the proposed filters is confirmed.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e75-a_3_362/_p
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@ARTICLE{e75-a_3_362,
author={Nobuo MURAKOSHI, Eiji WATANABE, Akinori NISHIHARA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={A Synthesis of Variable IIR Digital Filters},
year={1992},
volume={E75-A},
number={3},
pages={362-368},
abstract={It is sometimes required to change the frequency characteristics of a digital filter during its operation. In this paper a new synthesis of variable even-order IIR digital filters is proposed. The cut-off frequency of the filter can be changed by a single parameter. The fundamental filter structure is a cascade of second-order sections. The multiplier coefficients of each section are determined by using the Taylor series expansion of the lowpass to lowpass frequency transformation. For this method any second-order section can be used as a prototype, but here in this paper only the direct form and the lattice form are described. Unlike the conventional method, any transfer functions can be used for the proposed method. Finally a designed example shows that the proposed filter has wider tuning range than the conventional filter, and the advantage of the proposed filters is confirmed.},
keywords={},
doi={},
ISSN={},
month={March},}
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TY - JOUR
TI - A Synthesis of Variable IIR Digital Filters
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 362
EP - 368
AU - Nobuo MURAKOSHI
AU - Eiji WATANABE
AU - Akinori NISHIHARA
PY - 1992
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E75-A
IS - 3
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - March 1992
AB - It is sometimes required to change the frequency characteristics of a digital filter during its operation. In this paper a new synthesis of variable even-order IIR digital filters is proposed. The cut-off frequency of the filter can be changed by a single parameter. The fundamental filter structure is a cascade of second-order sections. The multiplier coefficients of each section are determined by using the Taylor series expansion of the lowpass to lowpass frequency transformation. For this method any second-order section can be used as a prototype, but here in this paper only the direct form and the lattice form are described. Unlike the conventional method, any transfer functions can be used for the proposed method. Finally a designed example shows that the proposed filter has wider tuning range than the conventional filter, and the advantage of the proposed filters is confirmed.
ER -
English
