Appeal No. 1997-2151
Application No. 08/221,959
BACKGROUND
The appellant's invention relates to a phase-locked sync stripper. An understanding
of the invention can be derived from a reading of exemplary claim 14, which is reproduced
below.
14. A circuit for stripping a synchronization component from a composite video signal,
the circuit comprising:
a phase-locked loop comprising:
a 10 MHZ clock phase-locked with a leading edge of a video sync
signal; and
a signal generating means which outputs a signal that encompasses
the video sync signal, said signal which begins a first predetermined time
period before a leading edge of the video sync and ends at a second
predetermined time period; and
an analog switch comprising a switchable input operational amplifier controlled by
said signal for switching a blank level voltage onto the composite video signal.
The prior art references of record relied upon by the examiner in rejecting the
appealed claims are:
Dolby 3,005,869 Oct. 24, 1961
Tanabe 3,681,522 Aug. 01,1972
Omori JP 63-219273 Sep. 12, 1988
(Japanese Patent specification)
Nonomura JP 4-192971 Jul. 13, 1992
(Japanese Patent specification)
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