STA328 datasheet(42/57 Pages) STMICROELECTRONICS

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STA328

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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

Table 61.

Limiter attack/release rate selection

LxA[3:0]

Attack rate

dB/ms

LxR[3:0]

Release rate

dB/ms

0000

3.1584

Fast

0000

0.5116

0001

2.7072

0001

0.1370

0010

2.2560

0010

0.0744

0011

1.8048

0011

0.0499

0100

1.3536

0100

0.0360

0101

0.9024

0101

0.0299

0110

0.4512

0110

0.0264

0111

0.2256

0111

0.0208

1000

0.1504

1000

0.0198

1001

0.1123

1001

0.0172

1010

0.0902

1010

0.0147

1011

0.0752

1011

0.0137

1100

0.0645

1100

0.0134

1101

0.0564

1101

0.0117

1110

0.0501

1110

0.0110

1111

0.0451

Slow

1111

0.0104

Gain

Attenuation

Saturation

RMS

Limiter

Gain/Volume

Input

Output

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