Cirrus Logic CS42L56 - Manual (Page 80)

80 DS851F2
CS42L56
6.31.2 ALC Minimum Threshold
Sets the minimum level at which to disengage the ALC’s attenuation or amplify the input signal at the re-
lease rate (ALCRRATE -
“ALC Release Rate” on page 80 ) until levels lie between the ALCMAX and AL-
CMIN thresholds.
Note: This setting is usually set slightly below the ALCMAX threshold.
6.32 Noise Gate Control (Address 25h)
6.32.1 Noise Gate All Channels
Sets which channels are attenuated when clipping on any single channel occurs.
6.32.2 Noise Gate Enable
Configures the noise gate.
ALCMIN[2:0] Threshold Setting
000 0 dB
001 -3 dB
010 -6 dB
011 -9 dB
100 -12 dB
101 -18 dB
110 -24 dB
111 -30 dB
Application: “Automatic Level Control (ALC)” on page 35
7 6 5 4 3 2 1 0
NGALL NG NG_BOOST THRESH2 THRESH1 THRESH0 NGDELAY1 NGDELAY0
NGALL Noise Gate triggered by:
0
Individual channel; Any channel that falls below the threshold setting triggers the noise gate attenuation for
ONLY that channel.
1
Both channels A & B; Both channels must fall below the threshold setting for the noise gate attenuation to
take effect.
NG Noise Gate Status
0 Disabled
1 Enabled