STA381BWS datasheet(145/174 Pages) STMICROELECTRONICS

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STA381BWS

7.16

Extended configuration register (addr 0x36)

The extended configuration register provides access to B2DRC and biquad 5, 6 and 7.

7.16.1

Dual-band DRC

The STA381BWS device provides a dual-band DRC (B2DRC) on the left and right channel

data path, as depicted in Figure 42. The dual-band DRC is activated by setting MDRCE = 1.

Figure 42. B2DRC scheme

The low-frequency information (LFE) is extracted from the 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 Chapter 7.11).

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 Chapter 7.11) as well as their volume control. To be noted that, in

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

Reserved

PS48DB

XAR1

XAR2

BQ5

BQ6

BQ7

00000000

B2DRC

Hi-pass XO

filter

B2DRC

Hi-pass XO

filter

Channel 1

Volume

DRC 1

Channel 3

Volume

DRC 2

- +

Channel 3

Volume

DRC 2

Channel 2

Volume

DRC 1

Obsolete

Product(s)

- Obsolete

Product(s)

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