### Examples

Consider the Haar filter bank discussed in §11.3.3, for which

(12.92) |

The paraconjugate of is

(12.93) |

so that

(12.94) |

Thus, the Haar filter bank is paraunitary. This is true for any power-complementary filter bank, since when is , power-complementary and paraunitary are the same property. For more about paraunitary filter banks, see Chapter 6 of [287].

**Next Section:**

Polyphase Analysis of Portnoff STFT

**Previous Section:**

Properties of Paraunitary Filter Banks