sta339bw STMicroelectronics, sta339bw Datasheet - Page 35

• Manufacturer Part Number: sta339bw
• Description: 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

STA339BW
6.4.4
6.4.5
6.4.6
6.4.7
Post-scale link
Table 31.
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.
Biquad coefficient link
Table 32.
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/anti-clipping bit
Table 33.
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.
Zero-detect mute enable
Table 34.
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.
3
4
5
6
Bit
Bit
Bit
Bit
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Post-scale link
Biquad coefficient link
Dynamic range compression/anti-clipping bit
Zero-detect mute enable
0
0
0
1
RST
RST
RST
RST
PSL
BQL
DRC
ZDE
Name
Doc ID 15251 Rev 4
Name
Name
Name
0: Limiters act in anti-clipping mode
1: Limiters act in dynamic range compression mode
0: Each channel uses individual post-scale value
1: Each channel uses channel 1 post-scale value
0: Each channel uses coefficient values
1: Each channel uses channel 1 coefficient values
Setting of 1 enables the automatic zero-detect mute
Description
Description
Description
Description
Register description
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