AN3959 datasheet(41/65 Pages) STMICROELECTRONICS

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AN3959

Software setup to use the STA381BW/STA381BWS devices (ST Map)

Doc ID 022081 Rev 3

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Figure 50.

STCompressor - offset control

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The offset is a user-programmable gain or volume control

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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

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By default the STCompressor is enabled and in pass-through

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Bit D4 of register 0x5A (STC_EN) is set to 1. This means STC is enabled

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Bit D5 of register 0x5A (STC_BYP) is set to 1. This means STC is in pass-through

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By default the STC band recombination is disabled

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Bit D0 register 0x5B (BRC_EN) is set to 0

7.2.2

Configuring and enabling the STCompressor

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Write the STC configuration

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Define the band splitter filtering

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Define the limiter threshold [-24, +12] dB with 0.25 dB/step

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Define the max. linear zone (compression threshold) [-48, 0] dB with 0.25 dB/step

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Define the compression ratio [1:1, 1:16]

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Define the attack rate [0, +16] dB/msec with 0.25 dB/ms step

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Define the release rate [0.0078, 1) dB/msec with 0.0039dB/msec step

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Define the dynamic attack

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Define the offset

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Enable the STC

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Set the STC_BYP bit (register 0x5A bit D1) to 0

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