本文导出了调频电视系统周期性电视信号和周期性随机电视信号受不同数字调制信号干扰时,基带加权干扰噪声功率和干扰减少因子的计算公式,从而可对静止图象和活动图象进行数模干扰的近似计算。文中还给出了简化了的精确计算方法。近似计算与精确计算的结果吻合得很好,表明这种近似计算式有较高的精确度。 In this paper, we derive the formulas for calculating the weighted power of interference noise and the reduction factor of the interference when the periodic television signal and the periodic random television signal of the FMTV system are interfered by different digital modulation signals, so that the still picture and the moving picture can be digitally modeled Approximate calculation of interference. The article also gives a simplified and accurate calculation method. The approximate calculation is in good agreement with the exact calculation, indicating that this approximation has a higher degree of accuracy.