Alpha Parameters

It is customary in the wave digital filter literature to define the alpha parameters as

 (F.17)

where are the admittances of the wave digital element interfaces (or reference admittances,'' in WDF terminology). In terms of the alpha parameters, the force-wave parallel adaptor performs the following computations:
 (F.18) (F.19)

We see that multiplies and additions are required. However, by observing from Eq.(F.17) that

we may implement , say, as in order to eliminate one multiply. In WDF terminology, port 1 is then a dependent port.
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