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AN3959 датащи(PDF) 41 Page - STMicroelectronics

номер детали AN3959
подробное описание детали  The purpose of this application note is to describe
PDF  65 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3959 датащи(HTML) 41 Page - STMicroelectronics

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AN3959
Software setup to use the STA381BW/STA381BWS devices (ST Map)
Doc ID 022081 Rev 3
41/65
Figure 50.
STCompressor - offset control
●
The offset is a user-programmable gain or volume control
●
When the STC is used, it is better to use offset instead of volume for location in the
processing path
There are 192 different settings (from 0 to +48) with 0.25 dB/step
7.2.1
STCompressor settings
●
By default the STCompressor is enabled and in pass-through
–
Bit D4 of register 0x5A (STC_EN) is set to 1. This means STC is enabled
–
Bit D5 of register 0x5A (STC_BYP) is set to 1. This means STC is in pass-through
●
By default the STC band recombination is disabled
–
Bit D0 register 0x5B (BRC_EN) is set to 0
7.2.2
Configuring and enabling the STCompressor
●
Write the STC configuration
–
Define the band splitter filtering
–
Define the limiter threshold [-24, +12] dB with 0.25 dB/step
–
Define the max. linear zone (compression threshold) [-48, 0] dB with 0.25 dB/step
–
Define the compression ratio [1:1, 1:16]
–
Define the attack rate [0, +16] dB/msec with 0.25 dB/ms step
–
Define the release rate [0.0078, 1) dB/msec with 0.0039dB/msec step
–
Define the dynamic attack
–
Define the offset
●
Enable the STC
–
Set the STC_BYP bit (register 0x5A bit D1) to 0



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