sta381bws STMicroelectronics, sta381bws Datasheet - Page 30

• Manufacturer Part Number: sta381bws
• Description: Sound Terminal 2.1-channel High-efficiency Digital Audio System Sound Terminal 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

Device overview
4.3.3
4.3.4
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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
default value is [-4, 4).
Table 9.
Please refer to
and to
Figure 9.
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.
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.
Input
Ch x
Table 13
CEXT_Bx[1]
Coefficients extended-range configuration 0x74h
Band splitter with 4
0
0
1
1
Section 6.24: User-defined coefficient control registers (addr 0x27 - 0x37)
for further details.
BQ 0
BQ 0
Band Splitter
Doc ID 018937 Rev 2
th
order filtering
CEXT_Bx[0]
BQ 1
BQ 1
0
1
0
1
Band 0
Band 1
…
…
+ =
Output
Ch x
Table
Reserved
Range
[-1;1)
[-2;2)
[-4;4)
STA381BWS
9. The range