/// <summary>
/// Generates transfer function.
/// </summary>
/// <param name="frequency">Normalized cutoff frequency in range [0..0.5]</param>
/// <param name="order">Filter order</param>
/// <param name="ripple">Ripple (in dB)</param>
private static TransferFunction MakeTf(double frequency, int order, double ripple = 0.1)
{
return(DesignFilter.IirLpTf(frequency, PrototypeChebyshevI.Poles(order, ripple)));
}
/// <summary>
/// TF generator
/// </summary>
/// <param name="freq"></param>
/// <param name="order"></param>
/// <returns></returns>
private static TransferFunction MakeTf(double freq, int order)
{
return(DesignFilter.IirLpTf(freq, PrototypeButterworth.Poles(order)));
}
/// <summary>
/// Generates transfer function.
/// </summary>
/// <param name="frequency">Normalized cutoff frequency in range [0..0.5]</param>
/// <param name="order">Filter order</param>
/// <param name="ripplePass">Passband ripple (in dB)</param>
/// <param name="rippleStop">Stopband ripple (in dB)</param>
private static TransferFunction MakeTf(double frequency, int order, double ripplePass = 1, double rippleStop = 20)
{
return(DesignFilter.IirLpTf(frequency,
PrototypeElliptic.Poles(order, ripplePass, rippleStop),
PrototypeElliptic.Zeros(order, ripplePass, rippleStop)));
}
/// <summary>
/// Generates transfer function.
/// </summary>
/// <param name="frequency">Normalized cutoff frequency in range [0..0.5]</param>
/// <param name="order">Filter order</param>
private static TransferFunction MakeTf(double frequency, int order)
{
return(DesignFilter.IirLpTf(frequency, PrototypeBessel.Poles(order)));
}
