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Author: search.filters.author.Cheevasuvit, F.End date: 1979

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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 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 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 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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    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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    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.