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STA333BW データシート(PDF) 47 Page - STMicroelectronics

部品番号 STA333BW
部品情報  2.1-channel high-efficiency digital audio system
PDF  64 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA333BW データシート(HTML) 47 Page - STMicroelectronics

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The release of limiter, when the gain is again increased, is dependent on a RMS-detect
algorithm. The output of the volume/limiter block is passed through a 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 it's 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 over-limiting can reduce the dynamic range to
virtually zero and cause program material to sound “lifeless”.
In AC mode, the attack and release thresholds are set relative to full-scale. In DRC mode,
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.
Figure 18.
Basic limiter and volume flow diagram



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