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Filter coefficients of high-pass and band-elimination recursive digital filters with a maximally flat group delay
(1979-10-01)
Thajchayapong, P.
;
Cheevasuvit, F.
The design technique for a recursive digital filter with a maximally flat group delay at an arbitrary specified frequency is known. It is shown here that, for certain cases, the filter coefficients for high-pass and band-elimination recursive digital filters with a maximally flat group delay can be expressed in closed forms.
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Transitional MURROMAF-MURROER filters with Additional Members
(1980-01-01)
Thajchayapong, P.
;
Suwatanapankul, V.
;
Cheevasuvit, F.
Recently, a method [4] has been described foi the design of transitional MURROMAF-MURROER filters whose members exhibit odd numbers of passband ripple peaks. An additional technique is proposed here to find also those with even numbers of the ripple peaks. Hence, transitional MURROMAF-MURROER filters with complete transitional members. Copyright © 1980 by The Institute of Electrical and Electronics Engineers, Inc.
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An Equiripple Bandpass Recursive Digital Filter with Adjustable Skirt Selectivities
(1980-01-01)
Thajchayapong, P.
;
Suwatanapankul, V.
;
Cheevasuvit, F.
A method is proposed for the design of a recursive digital filter with equiripple passband magnitude response and exchangeable zeros at ωT= 0 and ωT= π rad, hence adjustable skirt selectivities. It employs the transform variables technique which is well known for numerical accuracy. Copyright © 1980 by The Institute of Electrical and Electronics Engineers, Inc.
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An Alternative Simultaneous Maximally Flat Approximation for a Low-Pass Recursive Digital Filter
(1979-01-01)
Thajchayapong, P.
;
Cheevasuvit, F.
;
Karnchanawadee, P.
Digital filters with either maximally flat magnitude or maximally flat group delay are known [1]–[3]. This paper offers an approach to the design of a recursive digital filter with simultaneous approximation to both magnitude and phase. Although the same Taylor norm is used, this described technique is different from the previous approach [4] in the sense that it employs a power series expansion around ω = 0 in the z-plane. It gives an alternative insight into the problem for the designers who are more familiar with the z-plane than the Richards' λ-plane. The filter transfer functions are obtained explicitly in closed forms. Copyright © 1979 by The Institute of Electrical and Electronics Engineers, Inc.
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A recursive digital filter with simultaneous maximally flat magnitude and group delay at an arbitrary specified frequency
(1979-01-01)
Thajchayapong, P.
;
Karnchanawadee, P.
;
Cheevasuvit, F.
A design technique for a recursive digital filter with simultaneously maximally flat magnitude and group delay at an arbitrary specified frequency is presented. It employs the power series expansion to formulate a set of simultaneous linear equations which can be solved with a standard computational algorithm. Copyright © 1979 by Thc Institute of Ekctrical and EkcuPnics Engineers, Inc.
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A Design Technique for Transitional Butterworth-Chebyshev Filters
(1979-01-01)
Thajchayapong, P.
;
Cheevasuvit, F.
;
Suwatanapankul, V.
For most of the given filter orders, the design technique reported recently [1] can generate neither a complete nor a gradual transition of filters between the Chebyshev and Butterworth extremes. An alternative design is proposed here without such difficulties. Copyright © 1979 by The Institute Of Electrical And Electronics Engineers, Inc.
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A Maximally Flat Group Delay Recursive Digital Filter with Improved Passband Magnitude Response
(1979-01-01)
Thajchayapong, P.
;
Cheevasuvit, F.
A technique is proposed for the design of a recursive digital filter with maximally flat responses in both magnitude and group delay. In comparison to the previous designs [1] -[3], the magnitude and group delay always show smooth responses no matter what the difference is in the polynomial degrees of the numerator and denominator. Copyright © 1979 by The Institute of Electrical and Electronics Engineers, Inc.
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Transitional butterworth-chebyshev filters
(1978-09-28)
Thajchayapong, P.
;
Cheevasuvit, F.
;
Manapee, S.
A class of transitional Butterworth-Chebyshev filters is presented. The filters show gradual transition and, at the same time, maintain the equiripple peaks. © 1978, The Institution of Electrical Engineers. All rights reserved.
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Sine-cosine squared-magnitude function for maximally flat digital bandpass filters with adjustable skirt selectivities
(1979-01-01)
Thajchayapong, P.
;
Cheevasuvit, F.
A sine-cosine squared-magnitude function for a digital bandpass filter is proposed. It offers a maximally flat pass-band magnitude response and more flexibility on the number of exchangeable zeros at ωT = 0 and ωT = π rad. © 1979, The Institution of Electrical Engineers. All rights reserved.

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