CRD42L51 Cirrus Logic Inc, CRD42L51 Datasheet - Page 72

• Manufacturer Part Number: CRD42L51
• Description: Ref Bd Low-voltage Stereo Codec
• Manufacturer: Cirrus Logic Inc

72
6.26
NG_ALL
7
Function:
Sets the minimum level at which to disengage the ALC’s attenuation or amplify the input signal at a rate set
in the release rate register until levels again reach this minimum threshold. The ALC uses this minimum as
a hysteresis point for the input signal as it maintains the signal below the maximum as well as below the
minimum setting. This provides a more natural sound as the ALC attacks and releases.
Noise Gate Configuration & Misc. (Address 1Fh)
Noise Gate Channel Gang (NG_ALL)
Default: 0
0 - Disabled
1 - Enabled
Function:
Gangs the noise gate function for channel A and B. When enabled, both channels must fall below the thresh-
old setting for the noise gate attenuation to take effect.
Noise Gate Enable (NG_EN)
Default: 0
0 - Disabled
1 - Enabled
Function:
Enables the noise gate. Maximum attenuation is relative to all gain settings applied.
Noise Gate Boost (NG_BOOST) and Threshold (THRESH[3:0])
Default: 000
MIN[2:0]
100
101
THRESH[2:0]
011
110
111
NG_EN
000
001
010
100
101
011
110
111
6
Threshold
Setting
(dB)
-12
-18
-24
-30
-9
NG_BOOST
(NG_BOOST = ‘0’b)
Minimum Setting
5
Reserved
Reserved
-64 dB
-67 dB
-70 dB
-73 dB
-76 dB
-82 dB
THRESH2
4
(NG_BOOST = ‘1’b)
Minimum Setting
THRESH1
-34 dB
-37 dB
-40 dB
-43 dB
-46 dB
-52 dB
-58 dB
-64 dB
3
THRESH0
2
NGDELAY1
1
CS42L51
NGDELAY0
DS679F1
0