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STA321MPL 数据表(PDF) 43 Page - STMicroelectronics

部件名 STA321MPL
功能描述  Scalable digital microphone processor
PDF  50 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STA321MPL 数据表(HTML) 43 Page - STMicroelectronics

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STA321MP
Equalization and mixing
Doc ID 022647 Rev 1
43/50
8
Equalization and mixing
Figure 8.
Channel mixer
8.1
Post-scale
The STA321MP provides one additional multiplication after the last interpolation stage and
before the distortion compensation on each channel. This is a 24-bit signed fractional
multiply.
The scale factor for this multiply is loaded into RAM using the same I2C registers as the
biquad coefficients and the bass-management.
This post-scale factor can be used in conjunction with an ADC-equipped microcontroller to
perform power-supply error correction. All channels can use channel 1 by setting the post-
scale link bit.
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
CxMIX1
CxMIX2
CxMIX3
CxMIX4
CxMIX5
CxMIX6
CxMIX7
CxMIX8
Channel x
AM045333v1
Table 10.
RAM block for biquads, mixing, and bass management
Index
(decimal)
Index
(hex)
Coefficient
Default
0
0x00
Channel 1 - Biquad 1
C1H10 (b1/2)
0x000000
1
0x01
C1H11 (b2)
0x000000
2
0x02
C1H12 (a1/2)
0x000000
3
0x03
C1H13 (a2)
0x000000
4
0x04
C1H14 (b0/2)
0x400000
5
0x05
Channel 1 - Biquad 2
C1H20
0x000000



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