| 摘要 |
PURPOSE:To simplify adjustments between a reference signal and variable phase signal with a synchronizing signal obtained relatively, by generating a FM signal digitally and by stabilizing the reference phase signal. CONSTITUTION:Clock pulse CP26 is counted 27 and led to decoder 28 and when sixty coincidence circuits count a fixed number of CPs, a coincidence pulse is given to sampling circuit 29. On the other hand, CPs are counted 33, angle 180 deg. of a sine wave is divided into sixty, and the sine wave is shifted in the route of A1 A60 A1 for generation 30 of pulses, thereby performing sampling 29. Outputs of it, whose repetitive frequencies are twice as high as a desired FM signal (reference phase) of 9960+ or -480Hz, are divided 31 sequentially and passed through BPF 32 to obtain the desired 30Hz FM signal of 9960+ or -480Hz. In this constitution, A generator for reference phase signals and synchronizing signals of extremely excellent VHFOmniRange can be obtained. |
