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LinearSystems.BilinearUnwarp Method
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Return unwarped frequency according to the bilinear transform.

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

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

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

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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