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STA381BWS 데이터시트(PDF) 30 Page - STMicroelectronics

부품명 STA381BWS
상세설명  Sound Terminal® 2.1-channel high-efficiency digital audio system
PDF  171 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA381BWS 데이터시트(HTML) 30 Page - STMicroelectronics

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Device overview
STA381BWS
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Doc ID 018937 Rev 6
The band splitter filter coefficients have a user-selectable range [-1, 1), [-2, 2) and [-4, 4).
The RAM coefficient 0x7 is responsible for these settings according to Table 9. The range
default value is [-4, 4).
Table 9.
Coefficients extended-range configuration 0x74h
Please refer to Section 6.24: User-defined coefficient control registers (addr 0x27 - 0x37)
and to Table 13 for further details.
Figure 9.
Band splitter with 4th order filtering
4.3.3
Level meter
The level meter block measures the input signal level (in dB). Two kinds of measures are
performed: peak and RMS. The mapper configuration and the input signal automatically
determine which measurement to take into account.
4.3.4
Mapper
The mapper block computes the appropriate attenuation value (expressed in dB) to be
applied to the signal, basing its calculations on the level meter output value, on the
compressor threshold and on the limiter threshold.The attenuation value is then passed to
the attenuator block.
CEXT_Bx[1]
CEXT_Bx[0]
Range
00
[-1;1)
01
[-2;2)
10
[-4;4)
1
1
Reserved
…
…
+=
BQ 0
BQ 0
BQ 1
BQ 1
Band Splitter
Band 1
Band 0
Input
Ch x
Output
Ch x



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