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Second-order recursive digital-filter element for poles near the unit circle and the real z axis

Second-order recursive digital-filter element for poles near the unit circle and the real z axis

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An arrangement of a 2nd-order element for recursive digital filters is described which is particularly suitable when the desired poles are close to the unit circle and the real z axis in the z plane. Details are given for implementing the element using a single ‘multiply-and-add’ arithmetic unit.

References

    1. 1)
      • N.G. Kingsbury . Digital filtering using logarithmic arithmetic. Electron. Lett. , 56 - 58
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