STA3398 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
STA3398
STMicroelectronics
'STA3398' PDF : 78 Pages View PDF
STA339BW
Register description
SVUPE
Table 84. Soft volume (increasing) setup
Mode
0
When volume is increased, use the default rate
1
When volume is increased, use the rates defined by SVUP[4:0] .
When SVUPE = 1 the fade-in rate is defined by the SVUP[4:0] bits according to the formula:
Fade-in rate = 48 / (SVUP[4:0] + 1) dB/ms.
Table 85. Soft volume (decreasing) setup
SVDWE
Mode
0
When volume is decreased, use the default rate
1
When volume is decreased, use the rates defined by SVDW[4:0] .
When SVDWE = 1 the fade-out rate is defined by the SVDW[4:0] bits according to the
formula:
Fade-in rate = 48 / (SVDW[4:0] + 1) dB/ms.
7.20
DRC RMS filter coefficients (addr 0x39 - 0x3E)
D7
R_C0[23]
0
D6
R_C0[22]
0
D5
R_C0[21]
0
D4
R_C0[20]
0
D3
R_C0[19]
0
D2
R_C0[18]
0
D1
R_C0[17]
0
D0
R_C0[16]
1
D7
R_C0[15]
1
D6
R_C0[14]
1
D5
R_C0[13]
1
D4
R_C0[12]
0
D3
R_C0[11]
1
D2
R_C0[10]
1
D1
R_C0[9]
1
D0
R_C0[8]
0
D7
R_C0[7]
1
D6
R_C0[6]
1
D5
R_C0[5]
1
D4
R_C0[4]
1
D3
R_C0[3]
1
D2
R_C0[2]
1
D1
R_C0[1]
1
D0
R_C0[0]
1
D7
R_C1[23]
0
D6
R_C1[22]
1
D5
R_C1[21]
1
D4
R_C1[20]
1
D3
R_C1[19]
1
D2
R_C1[18]
1
D1
R_C1[17]
1
D0
R_C1[16]
0
D7
R_C1[15]
1
D6
R_C1[14]
1
D5
R_C1[13]
0
D4
R_C1[12]
0
D3
R_C1[11]
0
D2
R_C1[10]
0
D1
R_C1[9]
0
D0
R_C1[8]
0
D7
R_C1[7]
0
D6
R_C1[6]
0
D5
R_C1[5]
1
D4
R_C1[4]
0
D3
R_C1[3]
0
D2
R_C1[2]
1
D1
R_C1[1]
1
D0
R_C1[0]
0
Signal level detection in DRC algorithm is computed usign the following formula:
y(t) = c0 * abs(x(t)) + c1 * y(t-1)
where x(t) represents the audio signal applied to the limiter, and y(t) the measured level.
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