WM8945ECSSLASHR datasheet(40/169 Pages) WOLFSON

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WM8945

Production Data

PD, May 2011, Rev 4.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

12:8

DRC_KNEE2_OP

00000

Output signal at the Noise Gate

threshold ‘Knee2’.

00000 = -30dB

00001 = -31.5dB

00010 = -33dB

… (-1.5dB steps)

11110 = -75dB

11111 = -76.5dB

Only applicable when

DRC_KNEE2_OP_ENA = 1.

7:3

DRC_KNEE_OP

00000

Output signal at the Compressor

‘Knee1’.

00000 = 0dB

00001 = -0.75dB

00010 = -1.5dB

… (-0.75dB steps)

11110 = -22.5dB

11111 = Reserved

2:0

DRC_HI_COMP

011

Compressor slope (upper region)

000 = 1 (no compression)

001 = 1/2

010 = 1/4

011 = 1/8

100 = 1/16

101 = 0

110 = Reserved

111 = Reserved

R35 (23h)

DRC Control 7

9:8

DRC_NG_EXP

Noise Gate slope

00 = 1 (no expansion)

01 = 2

10 = 4

11 = 8

7:5

DRC_LO_COMP

000

Compressor slope (lower region)

000 = 1 (no compression)

001 = 1/2

010 = 1/4

011 = 1/8

100 = 0

101 = Reserved

11X = Reserved

Table 17 DRC Control Registers

GAIN LIMITS

The minimum and maximum gain applied by the DRC is set by register fields DRC_MINGAIN,

DRC_MAXGAIN and DRC_NG_MINGAIN. These limits can be used to alter the DRC response from

that illustrated in Figure 17. If the range between maximum and minimum gain is reduced, then the

extent of the dynamic range control is reduced.

The minimum gain in the Compression regions of the DRC response is set by DRC_MINGAIN. The

minimum gain in the Noise Gate region is set by DRC_NG_MINGAIN. The minimum gain limit

prevents excessive attenuation of the signal path.

The maximum gain limit set by DRC_MAXGAIN prevents quiet signals (or silence) from being

excessively amplified.

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