STA339BW datasheet(36/78 Pages) STMICROELECTRONICS

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STA339BW

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DocID15251 Rev 8

7.4.3

DSP bypass

Setting the DSPB bit bypasses the EQ function of the STA339BW.

7.4.4

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.

7.4.5

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.

7.4.6

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.

Table 31. DSP bypass

Bit

R/W

RST

Name

Description

R/W

DSPB

0: Normal operation

1: Bypass of biquad and bass/treble functions

Table 32. Post-scale link

Bit

R/W

RST

Name

Description

R/W

PSL

0: Each channel uses individual post-scale value

1: Each channel uses channel 1 post-scale value

Table 33. Biquad coefficient link

Bit

R/W

RST

Name

Description

R/W

BQL

0: Each channel uses coefficient values

1: Each channel uses channel 1 coefficient values

Table 34. 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

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