STA32813TR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STA32813TR

2.1-channel high-efficiency digital audio system

STMicroelectronics 

Register description

STA328

and therefore the release will only occur 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 over-limiting can reduce the dynamic range to virtually zero and cause

program material to sound “lifeless”.

In AC mode the attack and release thresholds are set relative to full-scale. In DRC mode 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.

Figure 17. Basic limiter and volume flow diagram

Gain/Volume

Input

Gain

Limiter

RMS

Attenuation

Saturation

Output

Table 61. Limiter attack/release rate selection

LxA[3:0]

Attack rate

dB/ms

LxR[3:0]

Release rate

dB/ms

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

3.1584

2.7072

2.2560

1.8048

1.3536

0.9024

0.4512

0.2256

0.1504

0.1123

0.0902

0.0752

0.0645

0.0564

0.0501

0.0451

Fast

Slow

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

0.5116

0.1370

0.0744

0.0499

0.0360

0.0299

0.0264

0.0208

0.0198

0.0172

0.0147

0.0137

0.0134

0.0117

0.0110

0.0104

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