WM5102 datasheet(75/334 Pages) WOLFSON

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Production Data

WM5102

PD, June 2014, Rev 4.2

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R3712

(0E80h)

DRC1 ctrl1

DRC1L_ENA

DRC1 (Left) Enable

0 = Disabled

1 = Enabled

DRC1R_ENA

DRC1 (Right) Enable

0 = Disabled

1 = Enabled

Table 12 DRC Enable

DRC Compression / Expansion / Limiting

The DRC supports two different compression regions, separated by a “Knee” at a specific input

amplitude. In the region above the knee, the compression slope DRC1_HI_COMP applies; in the

region below the knee, the compression slope DRC1_LO_COMP applies.

The DRC also supports a noise gate region, where low-level input signals are heavily attenuated. This

function can be enabled or disabled according to the application requirements. The DRC response in

this region is defined by the expansion slope DRC1_NG_EXP.

For additional attenuation of signals in the noise gate region, an additional “knee” can be defined

(shown as “Knee2” in Figure 31). When this knee is enabled, this introduces an infinitely steep drop-

off in the DRC response pattern between the DRC1_LO_COMP and DRC1_NG_EXP regions.

The overall DRC compression characteristic in “steady state” (i.e. where the input amplitude is near-

constant) is illustrated in Figure 31.

Figure 31 DRC Response Characteristic

The slope of the DRC response is determined by register fields DRC1_HI_COMP and

DRC1_LO_COMP. 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.

When the noise gate is enabled, the DRC response in this region is determined by the

DRC1_NG_EXP register. A slope of 1 indicates constant gain in this region. A slope greater than 1

represents expansion (ie. a change in input amplitude produces a larger change in output amplitude).

When the DRC1_KNEE2_OP knee is enabled (“Knee2” in Figure 31), this introduces the vertical line

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