STA382BWS Device overview
4.3.7 Offset
The offset is a user-selectable gain or volume control. When using the STC it is advised to use the offset to tune the output volume instead of the regular volume controls. The offset is located before the attenuator block, ensuring that the output power limit (limiter threshold) is never exceeded (
Figure 12
). On the other side, the traditional volume control is located after the STC attenuator, thus a wrong setting of this control could nullify the STC effect.
Each sub-band has its own and independent offset. Its range is [0, +48] dB with a 0.25 dB
step ( Table 12 ).
Figure 12.
Offset effect
The stereo link feature allows applying the same attenuation to the corresponding band of each channel (i.e. band 0 left channel and band 0 right or band 1 left channel and band 1 right channel). This should help to prevent image shifting that could occur when individually compressing each channel and causing a volume mismatch between left and right.
When the stereo link is active, the proper attenuation for each band is independently
computed, then the highest one for each band is applied ( Figure 13
).
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Doc ID 022784 Rev 1 35/172
