略語大辞典 [C] 27 PDF probability density function 確率密度関数.probability density function; e.g. Tikhonov PDF, a modified zero-order Bessel function with mean of zero, used to represent the probability density of phase error in a PLL with an input reference signal equal to the carrier plus AWGN(additive w 丸善「略語大辞典」JLogosID : 11855247