sta381bws STMicroelectronics, sta381bws Datasheet - Page 141

• Manufacturer Part Number: sta381bws
• Description: Sound Terminal 2.1-channel High-efficiency Digital Audio System Sound Terminal 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

STA381BWS
7.16
7.16.1
Extended configuration register (addr 0x36)
The extended configuration register provides access to B
Dual-band DRC
The STA381BWS device provides a dual-band DRC (B
data path, as depicted in
Figure 40. B
The low-frequency information (LFE) is extracted from left and right channels, removing the
high frequencies using a programmable Biquad filter, and then computing the difference with
the original signal. Limiter 1 (DRC1) is then used to control the amplitude of the left/right
high-frequency components, while limiter 2 (DRC2) is used to control the low-frequency
components (see
The cutoff frequency of the high-pass filters can be user-defined, XO[3:0] = 0, or selected
from the pre-defined values.
DRC1 and DRC2 are then used to independently limit L/R high frequencies and LFE
channel amplitude (see
this configuration, the dedicated channel 3 volume control can actually act as a bass-boost
enhancer as well (0.5 dB/step resolution).
The processed LFE channel is then recombined with the L and R channels in order to
reconstruct the 2.0 output signal.
MDRCE
D7
0
R
L
Reserved
2
DRC scheme
D6
0
Chapter
Chapter
Figure
Hi-pass XO
Hi-pass XO
PS48DB
B
B
7.11).
2
filter
2
filter
D5
DRC
DRC
0
Doc ID 018937 Rev 2
40. The dual-band DRC is activated by setting MDRCE = 1.
7.11) as well as their volume control. To be noted that, in
Register description: Sound Terminal compatibility
-
- +
XAR1
+
D4
0
Channel 3
Channel 2
Channel 1
Channel 3
Volume
Volume
Volume
Volume
XAR2
D3
0
2
DRC) on the left and right channels
2
DRC and biquad 5, 6 and 7.
BQ5
D2
DRC 2
DRC 1
0
DRC 1
DRC 2
+
+
BQ6
D1
0
BQ7
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D0
0