STA381BWS datasheet(74/171 Pages) STMICROELECTRONICS

tên linh kiện	STA381BWS

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STA381BWS

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Doc ID 018937 Rev 6

ERTHx[6:0]. Setting the ERTHx[7] bits to 1 automatically selects the anticlipping mode. The

release of the limiter, when the gain is again increased, is dependent on an RMS-detect

algorithm. The output of the volume/limiter block is passed through an RMS filter. The output

of this filter is compared to the release threshold, determined by the release threshold

increased at a rate dependent upon the release rate register. The gain can never be

increased past its set value and, therefore, the release only occurs if the limiter has already

reduced the gain. The release threshold value can be used to set what is effectively a

minimum dynamic range, this is helpful as overlimiting can reduce the dynamic range to

virtually zero and cause program material to sound “lifeless”.

In anticlipping mode, the attack and release thresholds are set relative to full-scale. In DRC

mode (bit D0 reg 0x0A set to 1), the attack threshold is set relative to the maximum volume

setting of the channels mapped to that limiter and the release threshold is set relative to the

maximum volume setting plus the attack threshold.

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