Digital Signal Processing Reference
In-Depth Information
X(k)
h(k)
k
k
0
1 2 3 4
2
1 0
1
2
3
4 5
( a )
( b )
h( 2 k)
h( k)
k
6 5 4 3 2 1
0
1
2
k
4
3
2
1 0
( d )
( c )
h(3 k)
k
10 1 2 3
( e )
h(10 k)
k
012345
6
7
8
9
10
( f )
Figure 2.4 Convolution sum explained.
by (2.5) can be computed for each value of n as shown below:
y( 0 )
=
x( 0 )h( 0 )
y( 1 )
=
x( 0 )h( 1 )
+
x( 1 )h( 0 )
y( 2 )
=
x( 0 )h( 2 )
+
x( 1 )h( 1 )
+
x( 2 )h( 0 )
y( 3 )
=
x( 0 )h( 3 )
+
x( 1 )h( 2 )
+
x( 2 )h( 1 )
+
x( 3 )h( 0 )
y( 4 )
=
x( 0 )h( 4 )
+
x( 1 )h( 3 )
+
x( 2 )h( 2 )
+
x( 3 )h( 1 )
+
x( 4 )h( 0 )
·
·
y(n)
=
x( 0 )h(n)
+
x( 1 )h(n
1 )
+
x( 2 )h(n
2 )
+
x( 3 )h(n
3 )
+· ··+
x(n)h( 0 )
·
(2.7)
·
·
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