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STA339BWS 数据表(PDF) 62 Page - STMicroelectronics

部件名 STA339BWS
功能描述  FFX with 100-dB SNR and dynamic range
PDF  79 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STA339BWS 数据表(HTML) 62 Page - STMicroelectronics

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Register description
STA339BWS
62/79
DocID015276 Rev 8
User-defined EQ
The STA339BWS can be programmed for four EQ filters (biquads) per each of the two input
channels. The biquads use the following equation:
Y[n] = 2 * (b0 / 2) * X[n] + 2 * (b1 / 2) * X[n-1] + b2 * X[n-2] - 2 * (a1 / 2) * Y[n-1] - a2 * Y[n-2]
= b0 * X[n] + b1 * X[n-1] + b2 * X[n-2] - a1 * Y[n-1] - a2 * Y[n-2]
where Y[n] represents the output and X[n] represents the input. Multipliers are 24-bit signed
fractional multipliers, with coefficient values in the range of 0x800000 (-1) to 0x7FFFFF
(0.9999998808).
40
0x28
Channel 1/2 - Biquad 8
for XO = 000
High-pass 2nd order filter
for XO
000
C12H0(b1/2)
0x000000
41
0x29
C12H1(b2)
0x000000
42
0x2A
C12H2(a1/2)
0x000000
43
0x2B
C12H3(a2)
0x000000
44
0x2C
C12H4(b0/2)
0x400000
45
0x2D
Channel 3 - Biquad
for XO = 000
Low-pass 2nd order filter
for XO
000
C3H0(b1/2)
0x000000
46
0x2E
C3H1(b2)
0x000000
47
0x2F
C3H2(a1/2)
0x000000
48
0x30
C3H3(a2)
0x000000
49
0x31
C3H4(b0/2)
0x400000
50
0x32
Channel 1 - Prescale
C1PreS
0x7FFFFF
51
0x33
Channel 2 - Prescale
C2PreS
0x7FFFFF
52
0x34
Channel 1 - Postscale
C1PstS
0x7FFFFF
53
0x35
Channel 2 - Postscale
C2PstS
0x7FFFFF
54
0x36
Channel 3 - Postscale
C3PstS
0x7FFFFF
55
0x37
TWARN/OC - Limit
TWOCL
0x5A9DF7
56
0x38
Channel 1 - Mix 1
C1MX1
0x7FFFFF
57
0x39
Channel 1 - Mix 2
C1MX2
0x000000
58
0x3A
Channel 2 - Mix 1
C2MX1
0x000000
59
0x3B
Channel 2 - Mix 2
C2MX2
0x7FFFFF
60
0x3C
Channel 3 - Mix 1
C3MX1
0x400000
61
0x3D
Channel 3 - Mix 2
C3MX2
0x400000
62
0x3E
Unused
63
0x3F
Unused
Table 72. RAM block for biquads, mixing, scaling, bass management (continued)
Index
(Decimal)
Index (Hex)
Description
Coefficient
Default



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