WM8944BECSSLASHR datasheet(31/165 Pages) CIRRUS

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WM8944B

Rev 4.3

DSP CORE

DSP Core is at the centre of the ADC / DAC / Digital Audio Interface (I2S) blocks. It provides signal

routing, and also implements a number of configurable signal processing functions.

The signal processing functions are arranged in three blocks, as follows:



Signal Enhancement 1 (SE1) - Low-pass / High-pass filter, 3D-stereo enhancement, 5 notch

filters, generic ‘Direct Form 1’ filter.



Signal Enhancement 2 (SE2)

– High Pass Filter, ReTune™ processing, 5-band equalizer.



Signal Enhancement 3 (SE3) - Dynamic range control.

Note that, although the WM8944B is largely a mono device, it supports a stereo signal path from the

digital microphone interface to the digital audio interface. In the default configuration, the analogue

input/output paths are associated with the Left channel of the digital audio interface.

The DSP Configuration modes and each of the Signal Enhancement blocks is described in the

following sections.

DSP CONFIGURATION MODES

The DSP Configuration Mode is determined using the SE_CONFIG register field; this configures the

signal paths between the Signal Enhancement blocks and the ADC, Digital Microphone, DAC and

Digital Audio interfaces. The supported DSP modes are illustrated in Figure 11.

DAC

DIGITAL AUDIO

INTERFACE

ADC

(Left)

DIGITAL AUDIO

INTERFACE

ADC

(Left)

DAC

DIGITAL AUDIO

INTERFACE

ADC

(Left)

SE2 (HPF,

Re-Tune, 5-band EQ)

DAC

DIGITAL AUDIO

INTERFACE

ADC

(Left)

SE2 (HPF,

Re-Tune, 5-band EQ)

SE3 (Dynamic

Range Control)

DAC

DSP Record Mode

DSP Playback Mode

DSP General Mode 1

DSP General Mode 2

SE1 (LPF/HPF,

5-notch, DF1)

SE2 (HPF,

Re-Tune, 5-band EQ)

SE3 (Dynamic

Range Control)

SE1 (LPF/HPF,

3D surround, 5-notch, DF1)

SE1 (LPF/HPF,

3D surround, 5-notch, DF1)

SE3 (Dynamic

Range Control)

SE1 (LPF/HPF,

3D surround, 5-notch, DF1)

SE2 (HPF,

Re-Tune, 5-band EQ)

SE3 (Dynamic

Range Control)

Digital Mic Interface

(Left + Right)

Digital Mic Interface

(Left + Right)

Digital Mic Interface

(Left + Right)

Digital Mic Interface

(Left + Right)

Figure 11 DSP Configuration Modes

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