从比较 Goell、Smith 及 Personick 各自提出的接收机灵敏度的三种计算公式知:①前两个公式是后一个公式在特殊情况下的近似式。②从计算的烦难程度来说,前者最简单,第二个次之,后者最烦。而从精确程度来说,则次序刚好倒转过来。③在 Personick公式中,如果用计算机计算出(∑_1-I_1)值的曲线,并且在(∑_1-I_1)较接近于0时,取r_1及 r_2的近似值,则 Personick 公式的计算也较简单。因而这一个公式可适用于任何情况而不必用其它两个式子。 From three comparisons of the receiver sensitivities proposed by Goell, Smith and Personick, respectively, we know: ① The first two formulas are the approximations of the latter formula in special cases. ② From the calculation of the degree of difficulty, the former is the simplest, the second followed, the latter most annoying. In the most exact terms, the order is just reversed. ③ In the Personick formula, if the curve of (Σ_1-I_1) is calculated by computer and the approximation of r_1 and r_2 is taken when (Σ_1-I_1) is closer to 0, the calculation of Personick formula is also simpler . Therefore, this formula can be applied to any situation without having to use the other two formulas.