STA382BW
Device overview
Doc ID 022783 Rev 1
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
. The range
default value is [-4, 4).
Table 9.
Coefficients extended-range configuration 0x74h
Section 6.24: User-defined coefficient control registers (addr 0x27 - 0x37)
and to
for further details.
Figure 9.
Band splitter with 4
th
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
0
0
[-1;1)
0
1
[-2;2)
1
0
[-4;4)
1
1
Reserved
…
…
+
=
BQ 0
BQ 0
BQ 1
BQ 1
B
a
nd
S
plitter
B
a
nd 1
B
a
nd 0
Inp
u
t
Ch x
O
u
tp
u
t
Ch x
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