/966 ■ Signal-flow graph reversal or transposition form Z y(n) b0 bl b2 x(n) x(n) b2 bl b0 X X critical path-TM+TA y(n) 2021年2月 102021年2月 10  Signal-flow graph reversal or transposition form Z-1 Z-1 b0 b1 b2 y(n) x(n) D D X X X + + x(n) y(n) b2 b1 b0 critical path=TM+TA