WM8944BECSSLASHR datasheet(35/165 Pages) CIRRUS

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WM8944B

Rev 4.3

DF1 FILTER

3D surround

5-notch filter

DF1 filter

L/HPF

Signal Enhancement Block 1 (SE1)

The DF1 filter is part of the SE1 block. This provides a direct-form 1 standard filter, as illustrated in

Figure 15. The default coefficients give a transparent filter response.

-1

Figure 15 Direct-Form 1 Standard Filter Structure

The DF1 response is defined by the following equations:

]

[

]

[

]

[

]

[

















The DF1 filters are enabled using the SE1_DF1_L_ENA and SE1_DF1_R_ENA registers bit defined

in Table 13.

The DF1 filter coefficients are programmed in registers R92 to R98. For the derivation of these

registers, refer to the configuration tools supplied with the WM8944B Evaluation Kit.

The DF1 filter can be used to implement very complex response patterns, with specific phase and

gain responses at different frequencies. Typical applications of this type of filter include the application

of refinements or compensations to other user-selected filters.

HPF

ReTuneTM

5-band EQ

Signal Enhancement Block 2 (SE2)

HPF

The High Pass Filter (HPF) is part of the SE2 block. The HPF cut-off frequency is fixed at 3.7Hz,

suitable for removing DC offsets in the record or playback path.

The filters are enabled using the SE2_HPF_L_ENA and SE2_HPF_R_ENA register bits defined in

Table 14.

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