Appeal No. 1996-0774 Page 7
Application No. 08/048,117
converter to which ... said reciprocal data is supplied as its
digital input ....” In short, the claim specifies generating
a reciprocal of the total amount of light and using this
reciprocal as a digital input to a D/A converter.
Fumiaki stabilizes a tracking servo system of an optical
recording and reproducing device. Purpose, Constitution. The
reference teaches a gain 20, which corresponds to a digital
value 33. An AGC circuit 18 employs the gain 20 for gain
control of a track shift difference signal 19. Constitution.
In short, Fumiaki teaches an AGC circuit that performs
gain control based on a gain. It mentions nothing about a
reciprocal of the total amount of light. Accordingly, the
reference does not teach generating the reciprocal and using
it as a digital input to a D/A converter. The examiner’s
comment that signal 20 is either a reciprocal of signal 13 or
at some point it becomes the reciprocal amounts to
speculation. He cannot base a rejection on speculation.
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