Cirrus Logic CS53L21 - Manual (Page 54)

54 DS700PP1
CS53L21
6.16 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
Function:
Sets the threshold level of the noise gate. Input signals below the threshold level will be attenuated to -96
dB. NG_BOOST = ‘1’b adds 30 dB to the threshold settings.
Noise Gate Delay Timing (NGDELAY[1:0])
Default: 00
00 - 50 ms
01 - 100 ms
10 - 150 ms
11 - 200 ms
Function:
Sets the delay time before the noise gate attacks. Noise gate attenuation is dictated by the SOFTx &
ZCROSS bit settings unless the disable bit for each function is enabled.
7 6 5 4 3 2 1 0
NG_ALL NG_EN NG_BOOST THRESH2 THRESH1 THRESH0 NGDELAY1 NGDELAY0
THRESH[2:0]
Minimum Setting
(NG_BOOST = ‘0’b)
Minimum Setting
(NG_BOOST = ‘1’b)
000 -64 dB -34 dB
001 -67 dB -37 dB
010 -70 dB -40 dB
011 -73 dB -43 dB
100 -76 dB -46 dB
101 -82 dB -52 dB
110 Reserved -58 dB
111 Reserved -64 dB