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Transition between a flat magnitude and a sharp cut-off lowpass filter
(1979-01-01)
Thajchayapong, P.
;
Lomtong, P.
A Butterworth lowpass filter provides excellent flatness around ω = 0 but the cut-off rate is low. Recently improvements to the cut-off rate have been made by introducing one ripple near the band edge. This paper offers a generalized design technique such that any degree of trade-offs between flat magnitude around ω = 0 and sharp cut-off at the band edge can be obtained while keeping the ratio of the reflected power to the transmitted power at minimum. © 1979 Taylor and Francis Group, LLC.
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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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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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Flat Magnitude Low-Pass Filters with a Pair of Imaginary-Axis Zeros
(1978-01-01)
Thajchayapong, P.
;
Lomtong, P.
It is known that the cutoff rate of a maximally flat low-pass filter can be improved either by introducing a pair of imaginary-axis zeros or relaxing the flatness condition. Making use of both techniques simultaneously, this correspondence describes how to design an nth-order low-pass filter with (n − 2) degree of flatness at ω = 0 rad/s and also including a pair of imaginary-axis zeros. Advantageous performances of the filters obtained are also described. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.
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A Maximally Flat Group Delay Recursive Digital Filter with Chebyshev Stopband Attenuation
(1978-01-01)
Thajchayapong, P.
;
Lomtong, P.
Due to the monotonically decaying nature of its magnitude response, an all-pole recursive digital filter, with its group delay approximating a prescribed constant value, does not exhibit a sharp transition band. Using transformation as the mathematical means, this correspondence describes a design technique for a recursive digital filter with a maximally flat group delay and a Chebyshev attenuation stopband. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.
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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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