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This section presents functions for creating and converting several kinds of
analog filter transfer functions that are commonly used in signal processing
applications. Particularly, these functions create analog prototypes that can
be used as inputs to the various IIR filter routines for conversion to digital
filters.

fnbut | Normalized Butterworth Lowpass Filter |

fncheb1 | Normalized Chebyshev Type 1 Lowpass Filter |

fncheb2 | Normalized Chebychev Type 2 Lowpass Filter |

fnbes | Normalized Bessel Lowpass Filter Transfer Function |

fn2clp | Converting From A Normalized To Continuous Lowpass Filter [O-Matrix function] |

fn2chp | Converting From A Normalized To Continuous Highpass Filter |

fn2cbp | Converting From A Normalized To Continuous Bandpass Filter [O-Matrix function] |

fn2cbs | Converting From A Normalized To Continuous Bandstop filter. |

fnbpole | Poles Of A Normalized Butterworth Filter [O-Matrix Function] |

fnc1pole | Poles of a Normalized Chebyshev TYPE 1 Analog Lowpass Filter |

polbes | Bessel polynomials of Order N |

gains | Complex Gain of a Laplace Transfer Function |

makealog | Analog Filter Design Tool |