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LinearSystems.LowpassToLowpass Function
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Frequency transformation from a lowpass to a lowpass filter in s-domain.

Pascal
procedure LowpassToLowpass(const z: TVec; const p: TVec; var k: Double; Freq: Double); overload;
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Description

Transform a lowpass filter prototype in zero-pole form to a lowpass filter, where the new cutoff frequency is Freq. Assumed sampling frequency is 2. The transformation is defined as ([1], p. 258): 

           s
  s --> -----
          Wu

  Wu - new cutoff frequency

References:  

[1] Theory and application of digital signal processing, Lawrence R. Rabiner and Bernard Gold. Prentice-Hall, 1975

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