ISD91200 Series Technical Reference Manual
Release Date: Sep 16, 2019
- 426 -
Revision 2.4
[2:0]
NGTHBST
Noise Gate Threshold
000 --- -39dB
001--- -45dB
010---- -51dB
011 --- -57dB
100 --- -63dB
101 --- -69dB
110 --- -75dB
111 --- -81dB
ALC Gain Control Register (ALC_GAIN)
Register
Offset
R/W
Description
Reset Value
ALC_GAIN
0x04
R/W
ALC GAIN Control Register
0x6fdc_0010
Table 7-16 ALC GAIN Control Register (ALC_GAIN, address 0x400B_0094)
31
30
29
28
27
26
25
24
PKLIMT[15:8]
23
22
21
20
19
18
17
16
PKLIMIT[7:0]
15
14
13
12
11
10
9
8
Reserved
7
6
5
4
3
2
1
0
INITGAINEN
ALCZCD
INITGAIN
Bits
Description
[31:16]
PKLIMIT
ALC Peak Limiter Threshold
Full scale - 0x7fff
Default value is 0x6fdc - 87.5% of full scale
[15:8]
Reserved
Reserved.
[7]
INITGAINEN
ALC Update Initial Gain
0 = ALC PGA GAIN load automatic calculating gain.
1 = ALC PGA GAIN load ALCINIT_GAIN
[6]
ZCEN
ALC Zero Crossing Enable
0 = zero crossing disabled.
1 = zero crossing enabled when update gain.