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to as power inversion.
: .
::where
::: = output signal to interference ratio.
::: = reference signal to interference ratio.
::: = frequency in the z-domain.

This formula means that the output signal to interference ratio at a particular frequency is the reciprocal of the reference signal to interference ratio.

Example: A fast food restaurant has a drive-up window. Before getting to the window, customers place their order by speaking into a microphone. The microphone also picks up noise from the engine

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