| 摘要 |
<p>An improved servo control apparatus for a VCR capable of minimizing jitter caused in a reproducing mode of the VCR by detecting a duty error of a horizontal synchronous signal and controlling the rotation speed of a drum motor using the thusly detected duty error, which includes first and second pulse shaping units for shaping a phase detection signal and a speed detection signal which are detected in accordance with the rotation of a motor; a speed error detector for detecting a speed error of the motor in accordance with a speed detection signal outputted from the first and second pulse shaping units and for filtering the thusly detected error; a phase error detector for detecting a phase error of the motor in accordance with a phase detection signal outputted from the first and second pulse shaping units and for filtering the thusly detected error; a jitter reducing unit for detecting a duty error by separating a synchronous signal from a reproduced picture signal and for outputting an assistant value signal of a speed control so as to control the speed of the motor in accordance with a detected duty error; a speed/phase control value adder for outputting a driving control signal of the motor in accordance with output signals of the speed error detector, the jitter reducing unit, and the phase error detector; and a motor controller for controlling the motor in accordance with a signal outputted from the speed/phase control value adder. <IMAGE></p> |
