/// <summary>
/// Generates transfer function.
/// </summary>
/// <param name="frequencyLow">Normalized low cutoff frequency in range [0..0.5]</param>
/// <param name="frequencyHigh">Normalized high 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 frequencyLow, double frequencyHigh, int order, double ripplePass = 1, double rippleStop = 20)
{
return(DesignFilter.IirBsTf(frequencyLow,
frequencyHigh,
PrototypeElliptic.Poles(order, ripplePass, rippleStop),
PrototypeElliptic.Zeros(order, ripplePass, rippleStop)));
}
/// <summary>
/// Generates transfer function.
/// </summary>
/// <param name="frequencyLow">Normalized low cutoff frequency in range [0..0.5]</param>
/// <param name="frequencyHigh">Normalized high 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 frequencyLow, double frequencyHigh, int order, double ripple = 0.1)
{
return(DesignFilter.IirBsTf(frequencyLow,
frequencyHigh,
PrototypeChebyshevII.Poles(order, ripple),
PrototypeChebyshevII.Zeros(order)));
}
/// <summary>
/// Generates transfer function.
/// </summary>
/// <param name="frequencyLow">Normalized low cutoff frequency in range [0..0.5]</param>
/// <param name="frequencyHigh">Normalized high cutoff frequency in range [0..0.5]</param>
/// <param name="order">Filter order</param>
private static TransferFunction MakeTf(double frequencyLow, double frequencyHigh, int order)
{
return(DesignFilter.IirBsTf(frequencyLow, frequencyHigh, PrototypeBessel.Poles(order)));
}
/// <summary>
/// TF generator
/// </summary>
/// <param name="f1"></param>
/// <param name="f2"></param>
/// <param name="order"></param>
/// <returns></returns>
private static TransferFunction MakeTf(double f1, double f2, int order)
{
return(DesignFilter.IirBsTf(f1, f2, PrototypeBessel.Poles(order)));
}
/// <summary>
/// TF generator
/// </summary>
/// <param name="f1"></param>
/// <param name="f2"></param>
/// <param name="order"></param>
/// <returns></returns>
private static TransferFunction MakeTf(double f1, double f2, int order, double ripple = 0.1)
{
return(DesignFilter.IirBsTf(f1, f2, PrototypeChebyshevI.Poles(order, ripple)));
}