Reflectance of an Impedance

Let
denote the driving-point impedance of an arbitrary
continuous-time LTI system. Then, by definition,
where
and
denote the Laplace transforms
of the applied force and resulting velocity, respectively.
The wave variable decomposition in Eq.
(C.74) gives

We may call the

We are working with reflectance for *force waves.*
Using the elementary relations Eq.
(C.73), *i.e.*,
and
, we immediately obtain the corresponding
*velocity-wave reflectance:*

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