class="bi x0 y0 w0 h1"
class="bi x0 y0 w0 h1"
class="bi x0 y0 w0 h1"
X
X
X
+
+
X
X
X X
X
X
Z
-1
x(n)
+ y(n)
Z
-1
x(n)
x(n-1)
x(n) x(n-1)
x(n-1) x(n-1)
x(n) x(n)
-
)()
ˆ
,(
)(
)(
2


2 2

2
class="bi x0 y0 w0 h1"