码4的映射关系: aB faM+Bm) afM)+BfM) 00f(00)=0000 0=00000 01fM) 八(M) 0 f(M) f(M) f(M+M) f(M)+f(M) f(00+00)= f(00)+f(00)= f00.=0000100000 f(00+01)= f(00)+f(01)= f01)=01011(00001011=01011 f(00+10)= f(00)+f(10)= f10)=10101(0000(01)=10101 f(00+11) f(00)+f(11) f11)=114000(00110 f(01+10) f(01)+f(10)= f1)=110(0101)+(0101)=-1110 f(01+11) f(01)+f(11) 10)=10101(0101)+(110)=10101 f(10+11)= f(10)+f(11)= f(01)=01011(10101)+(1)=01011码 4 的映射关系： αβ f(αM+βM’) αf(M)+βf(M’) 0 0 f(00)=00000 0 = 00000  0 1 f(M’) f(M’) 1 0 f(M) f(M) 1 1 f(M+M’) f(M)+f(M’) f(00+00)= f(00)=00000 f(00)+ f(00)= (00000)+(00000)=00000 f(00+01)= f(01)=01011 f(00)+ f(01)= (00000)+(01011)=01011 f(00+10)= f(10)=10101 f(00)+ f(10)= (00000)+(10101)=10101 f(00+11)= f(11)=11110 f(00)+ f(11)= (00000)+(11110)=11110 f(01+10)= f(11)=11110 f(01)+ f(10)= (01011)+(10101)=11110 f(01+11)= f(10)=10101 f(01)+ f(11)= (01011)+(11110)=10101 f(10+11)= f(01)=01011 f(10)+ f(11)= (10101)+( 11110)=01011