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參數(shù)資料
| 型號： | AM79Q062JC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 編解碼器 |
| 英文描述： | A/MU-LAW, PCM CODEC, PQCC32 |
| 封裝： | PLASTIC, LCC-32 |
| 文件頁數(shù)： | 85/95頁 |
| 文件大小： | 1399K |
| 代理商： | AM79Q062JC |
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86
Am79Q06/061/062/063 Data Sheet
PROGRAMMABLE FILTERS
General Description of CSD Coefficients
The filter functions are performed by a series of
multiplications and accumulations. A multiplication is
accomplished by repeatedly shifting the multiplicand
and summing the result with the previous value at that
summation node. The method used in the QSLAC
device is known as Canonic Signed Digit (CSD)
multiplication and splits each coefficient into a series of
CSD coefficients.
Each programmable FIR filter section has the following
general transfer function:
Equation 1
where the number of taps in the filter = n + 1.
The transfer function for the IIR part of Z and B filters is:
Equation 2
The transfer function of the IIR part of the R filter is:
Equation 3
The values of the user-defined coefficients (hi) are
assigned via the MPI. Each of the coefficients (hi) is
defined in the following general equation:
Equation 4
where:
Mi = the number of shifts = Mi ≤ Mi + 1
Bi = sign = ±1
N = number of CSD coefficients
The value of hi in Equation 4 represents a decimal
number that is broken down into a sum of successive
values of:
±1.0 multiplied by 2–0, or 2–1, or 2–2 … 2–7 …
or
±1.0 multiplied by 1, or 1/2, or 1/4 … 1/128 …
The limit on the negative powers of two is determined by
the length of the registers in the ALU.
The coefficient hi in Equation 4 can be considered to be
a value made up of N binary 1s in a binary register
where the left part represents whole numbers, the right
part represents decimal fractions, and a decimal point
separates them. The first binary 1 is shifted M1 bits to
the right of the decimal point; the second binary 1 is
shifted M2 bits to the right of the decimal point; the third
binary 1 is shifted M3 bits to the right of the decimal
point, and so on.
When M1 is 0, the resulting value is a binary 1 in front
of the decimal point, that is, no shift. If M2 is also 0, the
result is another binary 1 in front of the decimal point,
giving a total value of binary 10 in front of the decimal
point (that is, a decimal value of 2.0). The value of N,
therefore, det er min es th e range of va lue s th e
coefficient hi can take (for example, if N = 3 the
maximum and minimum values are ±3, and if N = 4 the
values are between ±4).
Detailed Description of QSLAC Device Coefficients
The CSD coding scheme in the QSLAC device uses a value called mi, where m1 represents the distance shifted right
of the decimal point for the first binary 1. m2 represents the distance shifted to the right of the previous binary 1, and
m3 represents the number of shifts to the right of the second binary 1. Note that the range of values determined by N
is unchanged. Equation 4 is now modified (in the case of N = 4) to:
Equation 5
Equation 6
Equation 7
where:
M1 = m1
B1 = C1
M2 = m1 + m2
B2 = C1 C2
M3 = m1 + m2 + m3
B3 = C1 C2 C3
M4 = m1 + m2 + m3 + m4
B4 = C1 C2 C3 C4
HF z
() h
0
h
1z
1
–
h
2z
2
–
… h
nz
n
–
+++
+
=
HI z
()
1
1h
n1
+
()z
1
–
-------------------------------
=
HI z
()
1z
1
–
1h
n1
+
()z
1
–
-------------------------------
=
h
i
B
12
M
1
–
B
22
M
–
2
… B
N2
M
N
–
++
+
=
h
i
B
12
M
1
–
B
22
M
2
–
B
32
M
3
–
B
42
M
4
–
+++
=
h
i
C1
2
m1
–
C1
C
22
m1
m2
+
()
–
C1
C
2C
32
m1
m2
m3
++
()
–
C1
C2
C3
C4
2
m1
m2
m3
m4
+++
()
–
++
+
=
h
i
C1
2
m1
–
1C2
2
m2
–
1C3
2
m3
–
1C4
2
m4
–
+
()
+
[]
+
{}
=
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