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- The symbol
on a WDF adaptor port denotes a reflection-free port (RFP)
- To make a port reflection-free, its wave-impedance must be the
This choice of port impedance zeros the impedance step ``seen'' by waves
in the RFP, thus suppressing instantaneous reflection from it
- All ports outgoing from the BCT root must be RFPs, for
computability (no delay-free loops)
- Computations propagate (each sample) from the leaves of the
tree (delay element outputs) up to the root, where there is an apex
reflection which then propagates back down to all of the
reflection-free ports, thereby updating all of the delay elements
(capacitor/spring and inductor/mass states)
- When an element value changes (typically a resistor),
RFPs must be recalculated up to the root.
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Download WaveDigitalFilters.pdf
Download WaveDigitalFilters_2up.pdf
Download WaveDigitalFilters_4up.pdf