| 摘要 |
PURPOSE:To decrease an identification error without the excess of phase control width to a remote signal point from a signal point arranging coordinate origin by decreasing the weight to the signal point near the signal point arranging coordinate origin so as to decrease the phase control width of a voltage controlled oscillator. CONSTITUTION:When a signal near the signal point arranging coordinate origin in plural signal points is identified by a distance identification means 5, the weighting by a weighting means 7 is decreased and an output is obtained selectively by a control signal selecting means 4, the weighting means applies weighting so as to form a multi-value control pulse by using a control pulse at the identification of a signal near the signal point arranging coordinate origin and a control pulse at the identification of a signal remote from the origin. Then a multi-value control pulse is used as a control voltage via a low pass filter, the control voltage is fed to a voltage controlled oscillator 6 to control the phase of a recovered carrier. Identification output signals (b, f) of the 2nd path are fed from identification devices 17, 19 to an AND circuit 31 and its output signal (n) represents a signal point near the said origin. |
