Appeal No. 1998-0818
Application No. 08/319,143
suggestion to use the specific filters of paragraphs (b) and
(d) of the claims.
On page 5 of the Answer, the Examiner takes the Official
Notice, "that synthesis of a complex-valued inverse filter by
the tandem arrangement of an amplitude-encoded transparency
with a binary-phase encoded transparency has been known for
decades. Notably, restriction of the phase levels to values
of 0 and B radians causes the complex filter variables to be
real-valued everywhere during the computation." Further, with
respect to claim 14, the Examiner states "the selection of any
particular transmissivity would have been a rather obvious
matter of adapting the amplitude-encoded mask to the
distortion of the particular optical channel in use."
We find that the scope of claims 11 and 12 includes that
the phase encoded filter is only one of a binary coded filter,
ternary phase coded filter, and an amplitude coded filter
having a shifted distortion function. This scope is shown in
the following language common to claims 11 and 13, paragraph
(b): "a phase encoded filter having the form selected from the
group consisting essentially of a binary coded filter, a
ternary phase coded filter, and an amplitude coded filter
14
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