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LinearSystems.BilinearPrewarp Method
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Returns prewarped frequency according to the bilinear transform.

Syntax
C#
Visual Basic
public static double BilinearPrewarp(double Freq, double FS);
Remarks

The function returns the frequency, which will map to Freq after the bilinear transformation has been aplied. The mapping is defined as ([1], p. 338, eq 8.28):

Result = (2/Pi)*ArcTan(Freq/(2*FS));

FS defines the sampling frequency. T = 1/FS. 

References:  

[1] Digital signal processing, Vinay K. Ingle and John G. Proakis, Brooks-Cole, 2000

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