Patent ID: 6195500
Filing Date: 2001-02-27
Classification: G11B

Abstract:
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; andcapstan 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.