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STA381BWS 데이터시트(PDF) 74 Page - STMicroelectronics

부품명 STA381BWS
상세설명  Sound Terminal® 2.1-channel high-efficiency digital audio system
PDF  171 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA381BWS 데이터시트(HTML) 74 Page - STMicroelectronics

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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
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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