WM8912 datasheet(23/128 Pages) WOLFSON

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Production Data

WM8912

PD, Rev 4.0, September 2010

The slope of the DRC response is determined by register fields DRC_HI_COMP and

DRC_LO_COMP respectively. A slope of 1 indicates constant gain in this region. A slope less than 1

represents compression (i.e. a change in input amplitude produces only a smaller change in output

amplitude). A slope of 0 indicates that the target output amplitude is the same across a range of

input amplitudes; this is infinite compression.

The “knee” in Figure 15 is determined by register fields DRC_KNEE_IP and DRC_KNEE_OP.

Parameter Y0, the output level for a 0dB input, is not specified directly, but can be calculated from

the other parameters, using the equation.

The DRC Compression parameters are defined in Table 2.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R43 (2Bh)

DRC Control 3

10:5

DRC_KNEE_IP

[5:0]

00_0000

Input signal at the Compressor

'knee'.

000000 = 0dB

000001 = -0.75dB

000010 = -1.5dB

… (-0.75dB steps)

111100 = -45dB

111101 to 111111 = Reserved

4:0

DRC_KNEE_OP

[4:0]

0_0000

Output signal at the Compressor

'knee'.

00000 = 0dB

00001 = -0.75dB

00010 = -1.5dB

… (-0.75dB steps)

11110 = -22.5dB

11111 = Reserved

R42 (2Ah)

DRC Control 2

5:3

DRC_HI_COMP

[2:0]

000

Compressor slope (upper region)

000 = 1 (no compression)

001 = 1/2

010 = 1/4

011 = 1/8

100 = 1/16

101 = 0

110 to 111 = Reserved

2:0

DRC_LO_COMP

[2:0]

000

Compressor slope (lower region)

000 = 1 (no compression)

001 = 1/2

010 = 1/4

011 = 1/8

100 = 0

101 to 111 = Reserved

Table 2 DRC Compression Control

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