參數(shù)資料
型號(hào)： AM79C202
廠商： Electronic Theatre Controls, Inc.
英文描述： Advanced Subscriber Line Interface Circuit
中文描述： 高級(jí)用戶線接口電路
文件頁(yè)數(shù)： 42/48頁(yè)
文件大小： 501K
代理商： AM79C202
42
Am79213/Am79C203/031 Data Sheet
where:
M
1
= m
1
M
2
= m
1
+m
2
M
3
= m
1
+m
2
+m
3
M
4
= m
1
+m
2
+m
3
+m
4
In the ASLAC device, a coefficient, h
i
, consists of N CSD coefficients, each being made up of 4 bits and formatted
as C
xy
m
xy
, where C
xy
is one bit (MSB) and m
xy
is 3 bits. Each CSD coefficient is broken down as follows:
C
xy
is the sign bit (0 = positive, 1 = negative).
m
xy
is the 3-bit shift code. It is encoded as a binary number as follows:
B
1
= C
1
B
2
= C
1
C
2
B
3
= C
1
C
2
C
3
B
4
= C
1
C
2
C
3
C
4
000:
0 shifts
001:
1 shifts
010:
2 shifts
011:
3 shifts
100:
4 shifts
101:
5 shifts
110:
6 shifts
111:
7 shifts
y
is the coefficient number (the i in h
i
).
x is the position of this CSD coefficient within the h
i
coefficient. The most significant binary 1 is represented by x = 1.
The next most significant binary 1 is represented by x = 2, and so on.
Thus, C
13
m
13
represents the sign and the relative shift position for the first (most significant) binary 1 in the 4th (h
3
)
coefficient.
The number of CSD coefficients, N, is limited to 4 in the GR, GX, R, X, Z, and the IIR part of the B filter, and 3 for
the FIR part of the B filter. Note also that the GX-filter coefficient equation is slightly different from the other filters.
Equation (7)
Please refer to the Am79213/Am79C203/031 Technical Reference, PID 21325A detailing the commands for complete
details on programming the coefficients.
h
iGX
1
h
i
+
=
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