Abstract
The second-order allpass section is the main building block of the lattice wave digital filter (LTWDF). This is conventionally realised using two-port adaptors. The authors present a comparison between the two-port realisation of the second-order allpass section and another based on the three-port series adaptor. It is shown that the sample rate of LTWDFs can be increased by up to 90% with the three-port realisation.
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