| 摘要 |
PURPOSE:To facilitate easy design and adjustment by constituting the phase control circuit with the digital element and thus to enhance the stability, secular change and control accuracy as well as to realize the common use of the phase control system with the reception device. CONSTITUTION:One of the reception waves of 2-system receives the phase inversion by the low frequency, and then the other wave or both waves is/are processed through the phase shifter. Then the both waves are compounded to detect the signal corresponding to the low frequency, and the phase shifter is controlled using the above detected signal as the phase difference signal to secure the coincidence of the phase for the reception waves. In such diversity reception device, sensing signal S1 extracted through AGC amplifier via divider circuit 4 and using signal S0 sent from clock oscillator 3 as the reference signal is applied to exclusive logical sum circuit 2 which supplies signal S1 via A/D converter 1. Furthermore, shift register 5 which supplies the output of circuit 1 is given reference signal S0 to process the output of circuit 2, output S5 of register 5 and the output of circuit 2 are applied to adder circuit 6, and the contents of reversible counter 7 is modified by output S6 of circuit 6. |
