STA333BW datasheet(30/67 Pages) STMICROELECTRONICS

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STA333BW

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Doc ID 13773 Rev 3

Biquad coefficient link

For ease of use, all channels can use the biquad coefficients loaded into the Channel-1

coefficient RAM space by setting the BQL bit to 1. Therefore, any EQ updates only have to

be performed once.

Dynamic range compression / anticlipping bit

Both limiters can be used in one of two ways, anticlipping or dynamic range compression.

When used in anticlipping mode the limiter threshold values are constant and dependent on

the limiter settings. In dynamic range compression mode the limiter threshold values vary

with the volume settings allowing a nighttime listening mode that provides a reduction in the

dynamic range regardless of the volume level.

Zero-detect mute enable

Setting the ZDE bit enables the zero-detect automatic mute. The zero-detect circuit looks at

the data for each processing channel at the output of the crossover (bass management)

filter. If any channel receives 2048 consecutive zero value samples (regardless of fs) then

that individual channel is muted if this function is enabled.

Submix mode enable

Table 30.

Biquad coefficient link

Bit

R/W

RST

Name

Description

4R/W

BQL

0: each channel uses coefficient values

1: each channel uses channel 1 coefficient values

Table 31.

Dynamic range compression / anticlipping bit

Bit

R/W

RST

Name

Description

R/W

DRC

0: limiters act in anticlipping mode

1: limiters act in dynamic range compression mode

Table 32.

Zero-detect mute enable

Bit

R/W

RST

Name

Description

6R/W

ZDE

0: automatic zero-detect mute disabled

1: automatic zero-detect mute enabled

Table 33.

Submix mode enable

Bit

R/W

RST

Name

Description

7R/W

SME

0: submix into left / right disabled

1: submix into left / right enabled

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