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Unsymmetrical bandpass and bandstop digital filters

Unsymmetrical bandpass and bandstop digital filters

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The letter describes a transformation yielding unsymmetrical bandpass and bandstop filter pulse-transfer functions (p.t.f.s) by transforming a reference lowpass p.t.f. This function turns out not to be directly realisable since it is not an allpass transformation. It is shown that this transformation is the application of the Zdunek transformation in the z−1 plane.

Inspec keywords: digital filters

Subjects: Filters and other networks

References

    1. 1)
      • A.G. Constantinides . Frequency transformations for digital filters. Electron. Lett. , 115 - 116
    2. 2)
      • A.G. Constantinides . Frequency transformations for digital filters. Electron. Lett. , 487 - 489
    3. 3)
      • J. Zdunek . Generation of filter functions from a given model. Proc. Inst. Elect. Electron. Engrs. , 282 - 294
    4. 4)
      • K. Antreich , E. Gleissner . Über einige Anwendungsmöglichkeiten der Zdunek-Transformation in der Netzwerktheorie. Nachrichtentech. Z. , 101 - 105
    5. 5)
      • E. Christian , E. Eisenmann . (1966) , Filter design tables and graphs.
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