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要观察一帧电视图像中每一行的内容,必须使用专用选行示波器。本文介绍一种采用单片微机8748 H的智能接口,配上该接口之后,普通的示波器也能对电视信号进行选行测量。由于充分发挥了单片微机的特点,使奇偶场识别,行定位,选行行数设置、显示,触发脉冲形成等功能均由软件控制完成,使得接口的硬件电路变得十分简单,显示了单片微机在智能仪器中应用的潜力和适应性。
To view the contents of each line in a television image, a dedicated line oscilloscope must be used. This article describes an intelligent interface using a single-chip microcomputer 8748H, coupled with the interface, the common oscilloscope can also select the TV signal line measurement. Because give full play to the characteristics of single-chip microcomputer, so that the odd and even field identification, line positioning, setting the number of rows to choose, display, trigger pulse forming and other functions are controlled by the software to complete, making the interface hardware circuit becomes very simple, showing a single Potentiality and adaptability of microcomputer in intelligent instrument.