Appeal No. 1997-3853
Application No. 08/196,658
1. A phase control apparatus for a video cassette
recorder, comprising:
a control head for reproducing a control signal recorded
on a control track under a video track of a tape;
control signal amplification means for amplifying the
control signal reproduced by said control head at a varied
amplification gain;
control signal wave-shaping means for wave-shaping an
output signal from said control signal amplification means and
stabilizing a wave-shaped output signal;
amplification gain control means for controlling the
amplification gain of said control signal amplification means
in response to a counted number of pulses of an output signal
from said control signal wave-shaping means over a
predetermined time period;
phase control means for detecting a phase error and a
rotation speed of a capstan motor in response to the wave-
shaped output signal from said control signal wave-shaping
means and an output frequency from the capstan motor and
outputting phase and speed detect signals in accordance with
detected results; and
capstan motor driving means for driving the capstan motor
in response to the phase and speed detect signals from said
phase control means to correct the phase error of the capstan
motor.
The prior art references of record relied upon by the
examiner in rejecting the appealed claims are:
Quintus et al. (Quintus) 5,172,280 Dec.
15, 1992
Han 5,274,514 Dec. 28,
1993
(filed Mar. 24, 1992)
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