Do:the event associated with decision Ho D:the event associated with decision H D p(y|H1)π1p(y|Ho)πo (4.10) Do p(yHi) 元0 (4.11) p(y|Ho)0元1 Likelihood DI ratio 人L(y) TMAP UESTC DO 77 UESTC D0 : the event associated with decision H0 D1 : the event associated with decision H1 1 0 1 1 0 0 ( | ) ( | ) (4.10) D D p y H p y H     1 1 0 0 1 0 1 0 ( | ) (4.11) ( | ) ( ) D D D MAP D p y H p y H L y        Likelihood ratio