WM8993 datasheet(58/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

RETUNE

TM MOBILE PARAMETRIC EQUALIZER (EQ)

The ReTuneTM Mobile Parametric EQ is a circuit which can be enabled in the DAC path. The function

of the EQ is to adjust the frequency characteristic of the output in order to compensate for unwanted

frequency characteristics in the loudspeaker (or other output transducer). It can also be used to tailor

the response according to user preferences, for example to accentuate or attenuate specific

frequency bands to emulate different sound profiles or environments e.g. concert hall, rock etc.

The EQ is enabled as shown in Table 27.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R98 (62h)

EQ1

EQ_ENA

EQ Enable

0 = EQ disabled

1 = EQ enabled

Table 27 ReTuneTM Mobile Parametric EQ Enable

The EQ can be configured to operate in two modes - “Default” mode or “ReTuneTM Mobile” mode.

DEFAULT MODE (5-BAND PARAMETRIC EQ)

In default mode, the cut-off / centre frequencies are fixed as per Table 28. The filter bandwidths are

also fixed in default mode. The gain of the individual bands (-12dB to +12dB) can be controlled as

described in Table 29.

Note that the cut-off / centre frequencies noted in Table 28 are applicable to a DAC Sample Rate of

48kHz. When using other sample rates, these frequencies will be scaled in proportion to the selected

sample rate.

EQ BAND

CUT-OFF/CENTRE FREQUENCY

100 Hz

300 Hz

875 Hz

2400 Hz

6900 Hz

Table 28 EQ Band Cut-off / Centre Frequencies

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R99 (63h)

EQ2

4:0

EQ_B1_GAIN

[4:0]

01100b

(0dB)

EQ Band 1 Gain

-12dB to +12dB in 1dB steps

(see Table 30 for gain range)

R100 (64h)

EQ3

4:0

EQ_B2_GAIN

[4:0]

01100b

(0dB)

EQ Band 2 Gain

-12dB to +12dB in 1dB steps

(see Table 30 for gain range)

R101 (65h)

EQ4

4:0

EQ_B3_GAIN

[4:0]

01100b

(0dB)

EQ Band 3 Gain

-12dB to +12dB in 1dB steps

(see Table 30 for gain range)

R102 (66h)

EQ5

4:0

EQ_B4_GAIN

[4:0]

01100b

(0dB)

EQ Band 4 Gain

-12dB to +12dB in 1dB steps

(see Table 30 for gain range)

R103 (67h)

EQ6

4:0

EQ_B5_GAIN

[4:0]

01100b

(0dB)

EQ Band 5 Gain

-12dB to +12dB in 1dB steps

(see Table 30 for gain range)

Table 29 EQ Band Gain Control

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