STA382BWSTR datasheet(74/172 Pages) STMICROELECTRONICS

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STA382BWS

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Doc ID 022784 Rev 1

6.23

Dynamic control registers (addr 0x23 - 0x26 / addr 0x43 -

0x46)

6.23.1

Limiter 1 attack/release rate (L1AR addr 0x23)

6.23.2

Limiter 1 attack/release threshold (L1ATRT addr 0x24)

6.23.3

Limiter 2 attack/release rate ( L2AR addr 0x25)

6.23.4

Limiter 2 attack/release threshold ( L2 ATRT addr 0x26)

The STA382BWS includes two independent limiter blocks. The purpose of the limiters is to

automatically reduce the dynamic range of a recording to prevent the outputs from clipping

in anticlipping mode or to actively reduce the dynamic range for a better listening

environment such as a nighttime listening mode which is often needed for DVDs. The two

modes are selected via the DRC bit in Section 6.11: FUNCT register (addr 0x0A). Each

channel can be mapped to either limiter or not mapped, meaning that the channel will clip

when 0 dBfs is exceeded. Each limiter looks at the present value of each channel that is

mapped to it, selects the maximum absolute value of all these channels, performs the

limiting algorithm on that value, and then, if needed, adjusts the gain of the mapped

channels in unison.

The limiter attack thresholds are determined by the LxAT registers if the EATHx[7] (bit D7 of

is recommended in anticlipping mode to set this to 0 dBfs, which corresponds to the

maximum unclipped output power of an FFX amplifier. Since gain can be added digitally

within the STA382BWS it is possible to exceed 0 dBfs or any other LxAT setting. When this

occurs, the limiter, when active, automatically starts reducing the gain. The rate at which the

gain is reduced when the attack threshold is exceeded is dependent upon the attack rate

EATHx[7] bits to 1 selects the anticlipping mode.

The limiter release thresholds are determined by the LxRT registers if the ERTHx[7] (bit D7

of register 0x44 or 0x46) bits are set to 0, else the thresholds are determined by

L1A3

L1A2

L1A1

L1A0

L1R3

L1R2

L1R1

L1R0

L1AT3

L1AT2

L1AT1

L1AT0

L1RT3

L1RT2

L1RT1

L1RT0

L2A3

L2A2

L2A1

L2A0

L2R3

L2R2

L2R1

L2R0

L2AT3

L2AT2

L2AT1

L2AT0

L2RT3

L2RT2

L2RT1

L2RT0

Obsolete

Product(s)

- Obsolete

Product(s)

STA382BWSTR 数据表(PDF) 74 Page - STMicroelectronics

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