Appeal No. 1998-0817
Application 08/610,976
rotational speed of the rotating disk.
Appellant further points out that Rooke describes a
multiplexer 30 to permit selection of a reference signal
source as either reference signal 17 read from a disk or
reference signal 29 originating from the spindle control
provider. Appellant argues that Rooke does not teach using
both signals, only that a choice may be made between the two
signals. Appellant argues that Rooke does not lock onto a
frequency of the data recorded on the disk and does not adjust
a write clock signal generated based upon a data frequency for
the spindle speed variation. On pages 11 through 12,
Appellant further argues that Rooke does not disclose a phase
locked loop as required by claim 14.
The Examiner states on page 3 of the answer that the
rejection is set forth in paragraph 3 of the prior office
action, paper no. 12. Turning to the prior office action, we
find that in regard to claim 14, Examiner states that Rooke
teaches means for reading format data, (6 and 17), a PLL,
(28), means for monitoring actual rotation speed, (3), and
means responsive to monitoring means for controlling the PLL
to adjust the first clock signal to a frequency and phase that
-5-
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007