标准失真模拟分量视频信号源及其校准方法

Standard generator and its calibration method for analog component video signal with distortion

标准模拟分量视频测试信号参数单一,应用其对视频信号分析仪器校准时得到的结果不具有多样性。为解决这一问题,分析了模拟分量视频信号的测量原理,基于SDP2000信号编辑软件和TG700视频信号发生器,开发带有失真参数的模拟分量视频测试信号,并建立失真模拟分量视频信号源标准装置,对该装置的幅度电平和上升时间进行校准,评定了校准过程的测量不确定度。结果表明:幅度电平扩展测量不确定度为0.60%;上升时间扩展测量不确定度为0.19%(包含因子k=2)。该信号源可以发出带有失真量的标清和高清模拟分量视频测试信号,能够用于视频信号分析仪器的校准,得到多样化的结果,从而更加全面地评价仪器的测量准确性。

When standard analog component video test signal is employed to calibrate video signal analysis instrument, the measurement results are insufficient. To solve this problem, first, the measurement principle of analog component video signal was analyzed. Then, based on the SDP2000 signal editing software and TG700 video signal generator, analog component video test signal with distortion was developed. A standard video signal source was set up, whose voltage level and rise time were calibrated and the measurement uncertainty was analyzed. Results show that the expended uncertainty of voltage level is 0. 60 % and the expended uncertainty of rise time is 0. 19% （coverage factor k=2）. Such standard source is able to generate standard definition and high definition analog component video test signal with distortion, which can be used to calibrate video signal analysis instrument to obtain various results and evaluate the measurement accuracy of the instrument more comprehensively.