【简答题】设某离散平稳信源X,概率空间为 并设信源发出的符号只与前一个相邻符号有关,其联合概率为p(a i a j )如下表所示。 联合概率p(a i a j ) p(a i a j ) a i 0 1 2 a j 0 1/4 1/18 0 1 1/18 1/3 1/18 2 0 1/18 7/36 求信源的信息熵、条件熵与联合熵,并比较信息熵与条件熵的大小。
【单选题】一个平稳信源 X 的符号集 A={0 , 1} ,产生随机序列 {x n }, 其中 P(x 1 =0)=1/3, 则 P(x 3 =1) 的概率是
【简答题】弹力产生的条件是______、______.
【简答题】读短文,判断正(√)误(×)。 It's April 14th today. It's windy and sunny. We go hiking with our teachers. The birds are flying in the sky. The rabbits are jumping on the grass. The fish is swimming in the river. L...
【单选题】It's sunny today. Sam isn't doing his homework. He's at the park. He's playing with his friends. Look! He's kicking a goal. He's a good footballer! 4.Sam is _____.
【判断题】像方焦距:物距为无穷大时所对应的像距称为像方焦距
【简答题】设有一个信源,它产生0,1序列的信息。它在任意时间而且不论以前发生过什么符号,均按p(0)=0.4,p(1)=0.6的概率发出符号。 (1)试问这个信源是否是平稳的? (2)试计算 及 ; (3)试计算H(X 4 )并写出X 4 信源中可能有的所有符号。
【简答题】若二元一阶平稳马氏源的符号转移概率为 那么符号的平稳分布为P X (0)=______,P X (1)=______;信源的符号熵为______比特/符号,信源的剩余度为______。对于n元m阶马尔可夫信源,其状态空间共有______个不同的状态。