STA382BW datasheet(75/172 Pages) STMICROELECTRONICS

75 / 172 page

STA382BW

Doc ID 022783 Rev 1

75/172

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 register. When the RMS filter output falls below the release threshold, the gain is

again 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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