Appeal No. 95-2855
Application 08/075,338
to overrun this location by a preroll amount, and is stopped
[specification, page 3]. It typically happens that the tape is
not stopped at precisely the location of the desired frame of
video data. The tape is then played until the actual desired
frame is detected [Id.]. According to appellant, the time it
takes to locate this desired frame could be up to five seconds or
so [Id., page 4]. The invention seeks to reduce this period of
time for synchronizing the playback of video data to the desired
frame of data.
The invention achieves this goal by storing a plurality
of successive frames of data which are known to exist around the
desired frame of data. The invention can quickly compare a time
code of the desired frame of video data with the time codes of
each of the stored plurality of successive frames of data. Thus,
since the desired frame of data is already stored in one of the
storage areas, the desired frame of data can be immediately
output when desired.
The question to be resolved is whether there is any
indication from the original specification that the inventor ever
considered reading out more than the first desired frame of data.
Appellant argues that the memories 14-1 to 14-i clearly store
successive frames of the video signal [brief, page 8]. We agree
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