be the Wiener filter designed to yield an output which is the least-square approximation to
where
is the desired signal input. Let
be the Wiener filter designed to yield an output which is the least-square approximation to some linear operation
on the desired input signal. The following simple relationship has been shown to hold between
and
. If
is the desired input signal and
is the desired output, where
is some linear operation with respect to
, then
.