STA333BW datasheet(46/64 Pages) STMICROELECTRONICS

46 / 64 page

STA333BW

46/64

6.11

Dynamics control registers (0x12 to 0x15)

6.11.1

Limiter 1 attack/release rate

6.11.2

Limiter 1 attack/release threshold

6.11.3

Limiter 2 attack/release rate

6.11.4

Limiter 2 attack/release threshold

The STA333BW 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 anti-clipping mode or to actively reduce the dynamic range for a better listening

environment such as a night-time listening mode which is often needed for DVDs. The two

modes are selected via the DRC bit in Configuration Register F, bit 0 address 0x05. Each

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

0dBFS 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. It is recommended in

anti-clipping mode to set this to 0dBFS, which corresponds to the maximum unclipped

output power of a DDX amplifier. Since gain can be added digitally within STA333BW it is

possible to exceed 0dBFS 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 register setting for that

limiter. The gain reduction occurs on a peak-detect algorithm.

L1A3

L1A2

L1A1

L1A0

L1R3

L1R2

L1R1

L1R0

0110

1010

L1AT3

L1AT2

L1AT1

L1AT0

L1RT3

L1RT2

L1RT1

L1RT0

0110

1001

L2A3

L2A2

L2A1

L2A0

L2R3

L2R2

L2R1

L2R0

0110

1010

L2AT3

L2AT2

L2AT1

L2AT0

L2RT3

L2RT2

L2RT1

L2RT0

0110

1001

STA333BW датащи(PDF) 46 Page - STMicroelectronics

STA333BW датащи(HTML) 46 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

датащи скачать

ссылки URL