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Compare impulse In-variance method and BLT method.

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1

29kviews

Compare impulse In-variance method and BLT method.

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written 4.6 years ago by | modified 4.6 years ago by |

Impulse Invariance Method | Bilinear Transform Method |
---|---|

It is a many to one mapping technique. | It is a one to one mapping technique. |

The transfer function relation is $z = e^{ST}$ | The transfer function relation is $H(z) = H(s) $ / $S = \frac{2}{T} \ (\frac{1 - z^{-1}}{1 + \bar z^{-1}})$ |

Frequency relation $\Omega = \frac{W}{T}$ | Frequency relation $\Omega = \frac{2}{T} \ tan \ (\frac{w}{2})$ |

No frequency warping exists. | Frequency warping exists. |

Frequency aliasing exists. | NO Frequency aliasing. |

Best suitable for LPF and BPF design. | Suitable for all types of filter. |

Its a linear mapping. | Its a non linear mapping. |

Pre warping is not required. | Pre warping is required. |

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