BM28723AMUV
14.6 3 Band DRC - continued
Slope (α) setting of DRC1slope, DRC2slope, and DRC3slope
Each DRC can be set individually.
Default=0x80
Select Address
Explanation of Operation
[dB]
VO
The formula which asks for Slope α is described below.
changes into 8bit Hex data of the complement of 2 the value
calculated by calculation.
DRC1slope 0x29[7:0]
α =0x00
α
DRC2slope 0x31[7:0]
y
20
x
20
y
x
α
1020 1020
10 -10
DRC3slope 0x39[7:0]
AGC_TH2
y=-6dB
128
× 128
x
α
=
TH
x
20
TH
20
10 20 1020
10 -10
AGC_TH1
-12dB
α =0x80
TH is AGC_TH1. x is input level. y is output level.
Ex) It asks for α at the time of AGC_TH1 = -12dB, x = 0dB y = -6dB
-6
0
20
6
0
20
Slope function Compressor
Area Area
10 -10
= 1020 10
α
2×0 128
128
0
-12
0
20
12
20
10 -10
10 20 1020
α
= 85.266 → 0x55
VOinf
0x55calculated is setto command0x29, 0x31 or 0x39.
-12dB
x=0dB
VIinf
VI
AGC_TH1 setting of DRC1slope, DRC2slope, and DRC3slope
Please set this value is smaller than the value of AGC_TH2.
Each DRC can be set individually.
Default=0x40
Select Address
Explanation of Operation
DRC1slope 0x28[6:0]
DRC2slope 0x30[6:0]
DRC3slope 0x38[6:0]
Threshold
Value
0x00
…
-32dB
…
0x3F
0x40
0x41
-0.5dB
0dB
+0.5dB
…
0x58
…
+12dB
AGC_TH2 setting of DRC1comp, DRC2comp, DRC3comp, and DRC4
Each DRC can be set individually.
Default=0x40
Select Address
Explanation of Operation
DRC1comp 0x2C[6:0]
DRC2comp 0x34[6:0]
DRC3comp 0x3C[6:0]
Threshold
Value
0x00
…
-32dB
…
DRC4
0x40[6:0]
0x3F
0x40
0x41
-0.5dB
0dB
+0.5dB
…
0x58
…
+12dB
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TSZ02201-0C1C0E900720-1-2
31.Aug.2018 Rev.001
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