參數(shù)資料
型號(hào)： GF9101-CMQ
廠商： Electronic Theatre Controls, Inc.
英文描述： High Performance Multirate Digital Filter
中文描述： 高性能多速率數(shù)字濾波器
文件頁(yè)數(shù)： 11/23頁(yè)
文件大?。?/td> 188K
代理商： GF9101-CMQ
520 - 64 - 7
11
G
The filter coefficients are shown in Figure 10. The timing is verysimilar to that of the even-symmetric case.
Fig. 10 Input Data A
n
and Coefficients C
n
ASYMMETRIC FILTER
The GF9101 can be used as a 24-tap asymmetric filter by
configuring it the same way as the even-symmetric case.
The difference is in the memory locations since the
asymmetric case uses 24 different coefficients, i.e. two sets
of filter coefficients. The filter coefficients and the memory
locations are shown in Table 10.
The timing diagram is shown in Figure 11. The data flow
diagrams are shown in Figures 11a and 11b.
TABLE 9: Configuration Word for a 24-tap Symmetric Filter
BIT
NO.
CONFIG.
WORD
DESCRIPTION
0
1
3
Data A and B are both signed data
1
1
2
0
One register delay
3
0
4
0
24-tap filter, connect the outputs of
DATA_A_OUT to the inputs of DATA_B_IN.
5
X
Depending on the loading mode
6
X
See Table 1
NOTE
3. Bits 0 and 1 should have the same value for a 23 or 24 tap filter
C
4
C
5
C
6
C
7
C
8
C
9
C
10
C
3
C
2
C
1
C
0
C
11
A
17
A
16
A
15
A
14
A
24
A
23
A
22
A
21
A
20
A
19
A
18
C
4
C
5
C
6
C
7
C
8
C
9
C
10
C
3
C
2
C
1
C
0
C
11
A
4
A
5
A
6
A
7
A
8
A
9
A
10
A
3
A
2
A
1
A
0
A
11
A
12
A
13
(a) Filter Coefficients C
n
(b) Input Data A
n
TABLE 10:Internal RAM Address & Contents for a 24-tap
Asymmetric Filter
COEF_ADDR (6-0)
MEMORY CONTENTS
00
H
First set of 12 coefficients, C
0
—
> C
11
01
H
Second set of 12 coefficients, C23
—
> C12
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