參數(shù)資料
型號(hào)： 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(yè)數(shù)： 80/95頁(yè)
文件大小： 1399K
代理商： AM79Q062JC
SLAC Products
81
COP 3.Write/Read GR Filter Coefficients
GCI Command
(82/83h)
R/W = 0: Write
R/W = 1: Read
The coefficient for the GR filter is defined as:
Power Up and Hardware Reset (RST) Value = 23A1h, (HGR = 0.35547, or –8.984 dB)
COP 4.Write/Read Z Filter FIR Coefficients
GCI Command
(98/99h)
R/W = 1: Read
R/W = 0: Write
This command writes and reads only the FIR portion of the Z filter without affecting the IIR.
The Z-transform equation for the Z filter is defined as:
Sample rate = 32 kHz
For i = 0–5 and 7
Power Up and Hardware Reset (RST) Values = 0190 0190 0190 0190 0190 0190 01 0190 (Hex)
(Hz(z) = 0)
Note: Z6 is used for IIR filter scaling only. Its value is typically greater than zero but less than or equal to
one. The input to the IIR filter section is first increased by a gain of 1/Z6, improving dynamic range and
avoiding truncation limitations through processing within this filter. The IIR filter output is then multiplied
by Z6 to normalize the overall gain. Z5 is the actual IIR filter gain value defined by the programmed
coefficients, but it also includes the initial 1/Z6 gain. The theoretical effective IIR gain, without the Z6 gain
and normalization, is actually Z5/Z6.
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Command
1
0
1
W/R
Coefficient Byte 1
C40
m40
C30
m30
Coefficient Byte 2
C20
m20
C10
m10
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Command
1
0
1
0
R/W
I/O Data Byte 1
C40
m40
C30
m30
I/O Data Byte 2
C20
m20
C10
m10
I/O Data Byte 3
C41
m41
C31
m31
I/O Data Byte 4
C21
m21
C11
m11
I/O Data Byte 5
C42
m42
C32
m32
I/O Data Byte 6
C22
m22
C12
m12
I/O Data Byte 7
C43
m43
C33
m33
I/O Data Byte 8
C23
m23
C13
m13
I/O Data Byte 9
C44
m44
C34
m34
I/O Data Byte 10
C24
m24
C14
m14
H
GR
C10
2
m10
–
1C20
2
m20
–
1C30
2
m30
–
1C40
2
m40
–
+
()
+
()
+
()
=
H
z z
() z
0
z
1
z
1
–
z
2
z
2
–
z
3
z
3
–
z
4
z
4
–
z
5
z
6
z
7
z
1
–
1z
7
z
1
–
---------------------------------------
+
++
=
z
i
C1i
2
m1i
–
1C2i
2
m2i
–
1C3i
2
m3i
–
1C4i
2
m4i
–
+
()
+
[]
+
{}
=
z
6
C16
2
m16
–
1C26
2
m26
–
+
{}
=
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