Appeal No. 1998-1365 Page 9
Application No. 08/663,969
generat[es] a correction signal proportional to the detected
phase error. The generated correction signal is applied to a
control voltage input of the local clock oscillator for
adjusting the frequency thereof ....” Id. at ll. 50-55. By
detecting the phase error between the local and remote clock
signals, the reference determines the alignment between the
local clock signal and the remote clock signal, the latter
which serves as a reference clock signal.
Marshall not only teaches determining alignment between a
clock signal and a reference clock signal, but also teaches
determining the alignment by counting the number of cycles of
the clock signal occurring in a predetermined period of time.
The reference’s local clock signal is also called a “phase
increment signal.” Col. 2, l. 35. Marshall’s phase
difference counter receives the remote clock signal and the
phase increment signal. Col. 7, ll. 1-2. It responsively
“generat[es] a count value corresponding to the number of
cycles of said phase increment signal received during each
received cycle of said remote clock signal ....” Id. at ll.
2-5. By generating a count value corresponding to the number
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