STA339BW datasheet(35/77 Pages) STMICROELECTRONICS

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STA339BW

Doc ID 15251 Rev 5

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6.4.4

Post-scale link

Post-scale functionality can be used for power-supply error correction. For multi-channel

applications running off the same power-supply, the post-scale values can be linked to the

value of channel 1 for ease of use and update the values faster.

6.4.5

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.

6.4.6

Dynamic range compression/anti-clipping bit

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

When used in anti-clipping 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.

6.4.7

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.

Table 31.

Post-scale link

Bit

R/W

RST

Name

Description

3R/W

PSL

0: Each channel uses individual post-scale value

1: Each channel uses channel 1 post-scale value

Table 32.

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 33.

Dynamic range compression/anti-clipping bit

Bit

R/W

RST

Name

Description

R/W

DRC

0: Limiters act in anti-clipping mode

1: Limiters act in dynamic range compression mode

Table 34.

Zero-detect mute enable

Bit

R/W

RST

Name

Description

R/W

ZDE

Setting of 1 enables the automatic zero-detect mute

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