denote the 
matrix transfer
function of a paraunitary system. Some of its properties include the
following [98]:
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Paraunitary systems are essentially multi-input, multi-output (MIMO)
allpass filters. Let
denote the
matrix transfer
function of a paraunitary system. Some of its properties include the
following [98]:
), the matrix determinant,
![$ \det[\mathbf{H}(z)]$](img1654.png){kind=small}
, is an allpass filter.
contains FIR elements, its
determinant is a simple delay:
![$ \det[\mathbf{H}(z)]=z^{-K}$](img1655.png){kind=small}
for some
integer 
.
