Cirrus Logic CS42L56 - Manual (Page 81)

DS851F2 81
CS42L56
6.32.3 Noise Gate Threshold and Boost
THRESH sets the threshold level of the noise gate. Input signals below the threshold level will be attenu-
ated to -96 dB. NG_BOOST configures a +30 dB boost to the threshold settings.
6.32.4 Noise Gate Delay Timing
Sets the delay time before the noise gate attacks.
Note: The Noise Gate attack rate is a function of the sampling frequency, Fs, and the DIGSFT ( “Digital
Soft Ramp” on page 64 ) setting.
6.33 ALC and Limiter Soft Ramp, Zero Cross Disables (Address 26h)
6.33.1 ALCx Soft Ramp Disable
Configures an override of the analog soft ramp setting.
6.33.2 ALCx Zero Cross Disable
Configures an override of the analog zero cross setting.
6.33.3 Limiter Soft Ramp Disable
Configures an override of the digital soft ramp setting.
THRESH[2:0] Minimum Setting (NG_BOOST = 0b) Minimum Setting (NG_BOOST = 1b)
000 -64 dB -34 dB
001 -67 dB -36 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
NGDELAY[1:0] Delay Setting
00 50 ms
01 100 ms
10 150 ms
11 200 ms
7 6 5 4 3 2 1 0
ALCASRDIS ALCAZCDIS ALCBSRDIS ALCBZCDIS LIMSRDIS Reserved Reserved Reserved
ALCxSRDIS ALC Soft Ramp Disable
0 OFF; ALC Attack Rate is dictated by the DIGSFT ( “Digital Soft Ramp” on page 64 ) setting
1 ON; ALC volume changes take effect in one step, regardless of the DIGSFT setting.
ALCxZCDIS ALC Zero Cross Disable
0 OFF; ALC Attack Rate is dictated by the ANLGZC ( “Analog Zero Cross” on page 64 ) setting
1 ON; ALC volume changes take effect at any time, regardless of the ANLGZC setting.
LIMSRDIS Limiter Soft Ramp Disable
0 OFF; Limiter Attack Rate is dictated by the DIGSFT ( “Digital Soft Ramp” on page 64 ) setting
1 ON; Limiter volume changes take effect in one step, regardless of the DIGSFT setting.