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本文分析了“电视图象信号发生器”中采用视频方格图象信号产生电路的工作原理,并根据整机方格指标导出了脉宽与定时元件的设计公式,结合实用电路做了计算。本仪器产生黑白方格信号的信号源是横条振荡器和竖条振荡器,其电路形式是一种变形多谐振荡器。一般典型多谐振荡器的设计公式对它是不适用的。通过对这种变形多谐振荡器的设计和实验,可以看出应用文中导出的设计公式,其理论计算值与实验测试值是相接近的,有一定的实用参考价值。
In this paper, we analyze the working principle of using the video checkered image signal generation circuit in the “TV image signal generator” and derive the design formulas of the pulse width and timing components according to the whole checkered index, and calculate with the practical circuit. The instrument produces black and white square signal source is the horizontal bar oscillator and vertical bar oscillator, the circuit is a form of deformation multivibrator. The typical design of a typical multivibrator is not suitable for it. Through the design and experiment of the multivibrator, it can be seen that the design formulas derived from the application are close to the experimental values and have certain practical value.