WM8608 datasheet(32/54 Pages) WOLFSON

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WM8608

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PP Rev 1.5 March 2004

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

EQ1CF

Band 1 Front-Left/Front Right Centre-

Frequency

0 = High Cutoff (500Hz)

1 = Low Cutoff (250Hz)

EQ1CFC

Band 1 Front-Centre Centre-Frequency

0 = High Cutoff (500Hz)

1 = Low Cutoff (250Hz)

EQ2CF

Band 2 Front-Left/Front Right Centre-

Frequency

0 = High Cutoff (2kHz)

1 = Low Cutoff (1kHz)

EQ2CFC

Band 2 Front-Centre Centre-Frequency

0 = High Cutoff (2kHz)

1 = Low Cutoff (1kHz)

EQ3CF

Band 3 Front-Left/Front Right Cutoff

Frequency

0 = High Cutoff (8kHz)

1 = Low Cutoff (4kHz)

R18 (12h)

EQ Centre-

Frequency

Control

EQ3CFC

Band 3 Front-Centre Cutoff Frequency

0 = High Cutoff (8kHz)

1 = Low Cutoff (4kHz)

Table 29 EQ Frequency Control

Band 0 is controlled via the sub-woofer volume control register R11 as described in Table 32. The

functionality to add/subtract the boost/cut setting to the sub-woofer volume must be written into the

software controller for the chip.

The Band 0 Cutoff frequency can be changed using the corner frequency of the low-pass/high-pass

filters as described in Table 24.

DIGITAL LOUDSPEAKER EQUALISER

A loudspeaker equaliser is provided for the front three channels to compensate for high-frequency

variations that can occur when loudspeakers of different impedances are used with different output

filters in typical output stages. The equaliser has selectable cutoff frequencies which are independent

of sample rate. The gain at 20kHz is controllable in 0.5dB steps from -1.5dB to +2dB via the LSEQ

control bit. The settings are applied to all three front channels simultaneously.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LSCO

LSEQ Filter Characteristic

0 = High Cutoff (15kHz)

1 = Low Cutoff (10kHz)

R19 (13h)

Loudspeaker

Equaliser

3:1

LSEQ

[2:0]

100

(Disabled)

High Frequency Equalisation

000 = +2dB

001 = +1.5dB

010 = +1dB

011 = +0.5dB

100 = Disable

101 = -0.5dB

110 = -1dB

111 = -1.5dB

Table 30 Loudspeaker Equaliser

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