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fm television
相关语句
  调频电视
     A Theory of Interference for FM Television Systems
     调频电视系统的干扰理论
短句来源
     The RF signal may be a FM telephone signal, a FM television signal or an impulse radar signal.
     干扰信号可以是调频电话信号、调频电视信号或脉冲雷达信号。
短句来源
  相似匹配句对
     Television
     电视
短句来源
     A Theory of Interference for FM Television Systems
     调频电视系统的干扰理论
短句来源
     FM-SCM fiber optic multichannel television transmission
     FM-SCM光纤多路电视传输系统
短句来源
     SOUTHERN TELEVISION
     南方电视卫星频道
短句来源
     AR,FM(?)
     AR,FM(?)
短句来源
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: Formulas for calculating the interference noise power in base band and interference reduction factor of frequency modulated TV system interfered by RF signals are derived. The RF signal may be a FM telephone signal, a FM television signal or an impulse radar signal. Some useful conclusions based on theoretical analysis are also presented. The approximation used in calculating the interference reduction factor is discussed, and then some typical interference objectives including RF protection ratio...

: Formulas for calculating the interference noise power in base band and interference reduction factor of frequency modulated TV system interfered by RF signals are derived. The RF signal may be a FM telephone signal, a FM television signal or an impulse radar signal. Some useful conclusions based on theoretical analysis are also presented. The approximation used in calculating the interference reduction factor is discussed, and then some typical interference objectives including RF protection ratio and base band signal-to-noise ratio are calculated in detail.In the formulas derived, almost all important variables which affect the value of the interference reduction factor have been taken into account. These variables are carrier frequency off-set value, pre-emphasis factor, weighting factor, video spectral distribution and nominal peak to peak frequency deviation. If neglecting all the variables except nominal peak to peak frequency deviation, the derived formula may be reduced very closely to the approximate expression of results from objective measurements given by CGIR Rep. 634-1. This shows that the formulas given in this paper are a theoretical development to that local experimental knowledge. It is now possible to compute the interference into FM TV systems and the computation is as reliable as that in telephony. It is believed that the derived formulas will be usefulto interference analysis and co-ordination.

本文导出了调频电视系统受到射频干扰时的基带干扰噪声功率和干扰减少因子的计算公式。干扰信号可以是调频电话信号、调频电视信号或脉冲雷达信号。文中还从理论分析得出了一些有用的结论,讨论了计算干扰减少因子时引用的近似,并具体计算了一些典型的干扰指标,其中包括射频防护比与基带信噪比。 导出的公式计入了影响干扰减少因子值的全部重要变量。这些变量是载频差、预加重因子、加权因子、视频频谱分布以及标称峰-峰频偏。如果忽略掉除去标称峰-峰频偏以外的所有变量,则导出的公式化为很按近于CCIR Rep.634-1给出的客观测量结果近似表达式,这表明本文给出的公式是对该局部经验的理论发展,从而已能计算进入调频电视系统的干扰,而且和电话的干扰计算一样,计算是可靠的。可以确信,这对干扰分析与协调将是有用的。

 
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