WM8962B datasheet(101/295 Pages) WOLFSON

101 / 295 page

WM8962

Rev 4.3

101

DYNAMIC RANGE CONTROL (DRC)

VSS

HD Bass

DRC

DAC Signal Enhancement path

DAC

ReTune™

Second Order

HPF

5-band EQ

The dynamic range controller (DRC) is a circuit that can be enabled in either the digital record (ADC)

or the digital playback (DAC) path of the WM8962. Note that the DRC cannot be enabled in both

signal paths at the same time.

The function of the DRC is to adjust the signal gain in conditions where the input amplitude is

unknown or varies over a wide range, e.g. when recording from microphones built into a handheld

system.

The DRC can apply Compression and Automatic Level Control to the signal path. It incorporates

‘anti-clip’ and ‘quick release’ features for handling transients in order to improve intelligibility in the

presence of loud impulsive noises.

The DRC also incorporates a Noise Gate function, which provides additional attenuation of very low-

level input signals. This means that the signal path is quiet when no signal is present, giving an

improvement in background noise level under these conditions.

The DRC is enabled using DRC_ENA, as described in Table 55. The DRC is selected in the DAC

signal path by setting DRC_MODE = 1.

Additional registers for configuring the DRC are described in the “ADC Signal Path Enhancements”

section.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R276 (0114h)

DRC 1

DRC_MODE

DRC path select

0 = ADC path

1 = DAC path

DRC_ENA

DRC Enable

0 = Disabled

1 = Enabled

Table 55 DRC Mode and Enable

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