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STA350B датащи(PDF) 83 Page - STMicroelectronics

номер детали STA350B
подробное описание детали  2.1-channel high-efficiency digital audio system Sound TerminalR
PDF  94 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA350B датащи(HTML) 83 Page - STMicroelectronics

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DocID018572 Rev 7
83/94
STA350B, STA350BW
Register description
94
Figure 35. Biquad filter structure with quantization error noise-shaping
8.23
Extended coefficient range up to -4...4 (address 0x49, 0x4A)
Biquads from 1 to 7 have in the STA350Bx the possibility to extend the coefficient range
from [-1,1) to [-4..4). This allows the realization of high shelf filters that may require a
coefficients dynamic greater in absolute value than 1.
Three ranges are available, [-1;1) [-2;2) [-4;4). By default the extended range is not
activated to maintain backward compatibility with all the previous Sound Terminal products.
Each biquad has its independent setting according to the following table:
Table 76. Biquad filter settings
z
-1
z
-1
z
-1
z
-1
Q
In(t)
b0
b1
b2
a1
a2
z
-1
+
-
Out(t)
z
-1
z
-1
z
-1
z
-1
Q
In(t)
b0
b1
b2
a1
a2
z
-1
+
-
Out(t)
AM045197v1
D7
D6
D5
D4
D3
D2
D1
D0
CXTB4[1]
CXTB4[0]
CXTB3[1]
CXTB3[0]
CX_B2[1]
CXTB2[0]
CXTB1[1]
CXTB1[0]
0
0
00
00
0
0
D7
D6
D5
D4
D3
D2
D1
D0
Reserved
Reserved
CXTB7[1]
CXTB7[0]
CXTB6[1]
CXTB6[0]
CXTB5[1]
CXTB5[0]
0
0
00
00
0
0
CEXT_Bx[1]
CEXT_Bx[0]
00
[-1;1)
01
[-2;2)
10
[-4;4)
11
Reserved



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