Appeal No. 1998-1365 Page 14
Application No. 08/663,969
Marshall further teaches that the number of cycles of the
clock signal occurring in a predetermined period of time is
equal to the multiple when the clock signal generator is
operating correctly. As aforementioned regarding the
appellants’ first argument, the reference counts a number of
cycles of the phase increment signal occurring during each
cycle of the remote clock signal. Because the frequency of
the phase increment signal is 128-times greater than that of
the remote clock signal, 128 cycles would be counted when the
apparatus of the Marshall is operating properly.
Vanderspool also teaches that the frequency of the clock
signal is a multiple of the frequency of the reference clock
signal. Specifically, the reference’s sample clock has a
frequency of 50 kHz. Col. 8, ll. 3-4. Vanderspool’s 1PPS
signal, which serves as a reference clock signal, has a
frequency of “one pulse-per-second,” col. 7, l. 11, or 1 Hz.
The sample clock’s frequency of 50 kHz is 50,000-times greater
than the 1PPS signal’s frequency of 1 Hz. By employing a
sample clock frequency that is 50,000-times greater than the
1PPS signal’s frequency, the reference teaches that the
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