| 摘要 |
PURPOSE:To obtain a delay wave detecting circuit without being affected with the fluctuation of carrier frequency, by controlling the output phase of a delay circuit of the delay wave detecting circuit according to the frequency of an input signal. CONSTITUTION:The input digital modulated wave is divided into three parts by a signal branching circuit 1. The 1st output signal b1 is led to a phase wave detector 1; the 2nd outut signal b2 is led to the detector 1 through a delay circuit 3 that gives a delay of 10 seconds and a variable phase shifter 5; and the 3rd branched output b3 is X-multiplied by a multiplying device 6 and receives the discrimination of frequency through a frequency discriminator 6 after the elimination of the modulated signal component. The phase shift degree of the phase shifter 5 is controlled by the control signal given from the discriminator 6. |
