Cirrus-logic CS5378 Manuel d'utilisateur Page 43

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Vue de la page 42
CS5378
DS639F3 43
Table 13. SINC3 Filter Coefficients
Filter Type
System Function Filter Coefficients
SINC3 (Stage 1)
SINC3 (Stage 2)
SINC3 (Stage 3)
4
th
order decimate by 5
17 coefficients
4
1
5
1
1
)(
=
z
z
zH
h
0
= 1 h
9
= 80
h
1
= 4 h
10
= 68
h
2
= 10 h
11
= 52
h
3
= 20 h
12
= 35
h
4
= 35 h
13
= 20
h
5
= 52 h
14
= 10
h
6
= 68 h
15
= 4
h
7
= 80 h
16
= 1
h
8
= 85
SINC3 (Stage 4)
5
th
order decimate by 5
21 coefficients
5
1
5
1
1
)(
=
z
z
zH
h
0
= 1 h
11
= 365
h
1
= 5 h
12
= 320
h
2
= 15 h
13
= 255
h
3
= 35 h
14
= 185
h
4
= 70 h
15
= 121
h
5
= 121 h
16
= 70
h
6
= 185 h
17
= 35
h
7
= 255 h
18
= 15
h
8
= 320 h
19
= 5
h
9
= 365 h
20
= 1
h
10
= 381
SINC3 (Stage 5)
5
th
order decimate by 2
6 coefficients
5
1
2
1
1
)(
=
z
z
zH
h
0
= 1
h
1
= 5
h
2
= 10
h
3
= 10
h
4
= 5
h
5
= 1
SINC3 (Stage 6)
6
th
order decimate by 3
13 coefficients
6
1
3
1
1
)(
=
z
z
zH
h
0
= 1 h
7
= 126
h
1
= 6 h
8
= 90
h
2
= 21 h
9
= 50
h
3
= 50 h
10
= 21
h
4
= 90 h
11
= 6
h
5
= 126 h
12
= 1
h
6
= 141
SINC3 (Stage 7)
6
th
order decimate by 2
7 coefficients
6
1
2
1
1
)(
=
z
z
zH
h
0
= 1
h
1
= 6
h
2
= 15
h
3
= 20
h
4
= 15
h
5
= 6
h
6
= 1
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