| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a receiving circuit for a receiving wave having a function for automatically catching a desired signal wave coming into a fixed band. <P>SOLUTION: This receiving circuit is provided with an on/off control circuit for an automatic frequency control loop which performs a control operation that performs loop formation of an automatic frequency control loop and automatically controls the frequency of an oscillation output of a variable frequency oscillator when a control signal from an automatic gain control circuit is inserted into the automatic frequency control loop formed by a reception detection circuit, reference signal generator, phase comparator circuit, automatic frequency control circuit and the variable frequency oscillator and when an automatic gain control output exceeds a predetermined reference voltage. When a moving object moves according to a moving path, respective image signals transmitted by the transmission outputs of a plurality of microwaves from a plurality of transmitters are sequentially extracted as a stable video signal from a receiver. <P>COPYRIGHT: (C)2004,JPO |
