WM8904ECSSLASHR datasheet(54/188 Pages) WOLFSON

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WM8904

Pre-Production

PP, Rev 3.3, September 2012

The “knee” in Figure 29 is represented 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 16.

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 16 DRC Compression Control

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