參數(shù)資料
型號(hào)： AM79Q021VC
廠商： Electronic Theatre Controls, Inc.
英文描述： Quad Subscriber Line Audio-Processing Circuit (QSLAC) Devices
中文描述： 四用戶線路音頻處理電路（QSLAC）設(shè)備
文件頁(yè)數(shù)： 53/68頁(yè)
文件大?。?/td> 1361K
代理商： AM79Q021VC
SLAC Products
53
47. Read Transmit PCM Data
(CDh)
MPI Command
RSVD
Reserved for future use. Always write as 0, but 0 is not guaranteed when read.
Upper Transmit Data
XDAT contains A-law or
μ
-law transmit data in Companded mode.
XDAT contains upper data byte in Linear mode with sign in XDAT7.
48, 49. Write/Read FIR Z Filter Coefficients (FIR only)
(98/99h)
R/W = 0: Write
MPI Command
R/W = 1: Read
This command writes and reads only the FIR filter section without affecting the IIR.
The Z-transform equation for the Z filter is defined as:
Sample rate = 32 kHz
For i = 0 to 5 and 7
Power Up and Hardware Reset (
RST
) Values = 0190 0190 0190 0190 0190 0190 01 0190 (Hex)
(H
z
(z) = 0)
See note under Commands 31 and 32.
Note:
Z
6
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/Z
6
, improving dynamic range and
avoiding truncation limitations through processing within this filter. The IIR filter output is then multiplied
by Z
6
to normalize the overall gain. Z
5
is the actual IIR filter gain value defined by the programmed
coefficients, but it also includes the initial 1/Z
6
gain. The theoretical effective IIR gain, without the Z
6
gain
and normalization, is actually Z
5
/Z
6
.
D
7
1
D
6
1
D
5
0
D
4
0
D
3
1
D
2
1
D
1
0
D
0
1
Command
Output Data Byte 1
Output Data Byte 2
XDAT7
RSVD
XDAT6
RSVD
XDAT5
RSVD
XDAT4
RSVD
XDAT3
RSVD
XDAT2
RSVD
XDAT1
RSVD
XDAT0
RSVD
D
7
1
C40
C20
C41
C21
C42
C22
C43
C23
C44
C24
D
6
0
D
5
0
m40
m20
m41
m21
m42
m22
m43
m23
m44
m24
D
4
1
D
3
1
C30
C10
C31
C11
C32
C12
C33
C13
C34
C14
D
2
0
D
1
0
m30
m10
m31
m11
m32
m12
m33
m13
m34
m14
D
0
R/W
Command
I/O Data Byte 1
I/O Data Byte 2
I/O Data Byte 3
I/O Data Byte 4
I/O Data Byte 5
I/O Data Byte 6
I/O Data Byte 7
I/O Data Byte 8
I/O Data Byte 9
I/O Data Byte 10
H
z
z
( )
z
0
z
1
z
1
–
z
2
z
2
–
z
3
z
3
–
z
4
z
4
–
z
--------------------------------------
z
z
z
1
–
1
z
7
z
1
–
–
+
+
+
+
+
=
z
i
C1i
2
m1i
–
1
C2i
2
m2i
–
1
C3i
2
m3i
–
1
C4i
2
m4i
–
+
(
)
+
[
]
+
{
}
=
z
6
C16
2
m16
–
1
C26
2
m26
–
+
{
}
=
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