Using (C.53) to convert to normalized waves
Kelly-Lochbaum junction (C.60) becomes
It is interesting to define
possible for passive junctions since
, and note that
the normalized scattering junction is equivalent to a 2D rotation:
While it appears that scattering of normalized waves at a two-port junction requires four multiplies and two additions, it is possible to convert this to three multiplies and three additions using a two-multiply ``transformer'' to power-normalize an ordinary one-multiply junction .
The transformer is a lossless two-port defined by 
Figure C.23 illustrates a three-multiply normalized-wave scattering junction . The impedance of all waveguides (bidirectional delay lines) may be taken to be . Scattering junctions may then be implemented as a denormalizing transformer , a one-multiply scattering junction , and a renormalizing transformer . Either transformer may be commuted with the junction and combined with the other transformer to give a three-multiply normalized-wave scattering junction. (The transformers are combined on the left in Fig.C.23).
In slightly more detail, a transformer steps the wave impedance (left-to-right) from to . Equivalently, the normalized force-wave is converted unnormalized form . Next there is a physical scattering from impedance to (reflection coefficient ). The outgoing wave to the right is then normalized by transformer to return the wave impedance back to for wave propagation within a normalized-wave delay line to the right. Finally, the right transformer is commuted left and combined with the left transformer to reduce total computational complexity to one multiply and three adds.
It is important to notice that transformer-normalized junctions may have a large dynamic range in practice. For example, if , then Eq.(C.69) shows that the transformer coefficients may become as large as . If is the ``machine epsilon,'' i.e., for typical -bit two's complement arithmetic normalized to lie in , then the dynamic range of the transformer coefficients is bounded by . Thus, while transformer-normalized junctions trade a multiply for an add, they require up to % more bits of dynamic range within the junction adders. On the other hand, it is very nice to have normalized waves (unit wave impedance) throughout the digital waveguide network, thereby limiting the required dynamic range to root physical power in all propagation paths.