WM8750LEFLSLASHR datasheet(25/56 Pages) WOLFSON

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WM8750L

PP Rev 1.77 May 2003

3D STEREO ENHANCEMENT

The WM8750L has a digital 3D enhancement option to artificially increase the separation between

the left and right channels. This effect can be used for recording or playback, but not for both

simultaneously. Selection of 3D for record or playback is controlled by register bit MODE3D.

Important:

Switching the 3D filter from record to playback or from playback to record may only be done

when ADC and DAC are disabled. The WM8750L control interface will only allow MODE3D to

be changed when ADC and DAC are disabled (i.e. bits ADCL, ADCR, DACL and DACR in reg.

26 / 1Ah are all zero).

The 3D enhancement function is activated by the 3DEN bit, and has two programmable parameters.

The 3DWIDTH setting controls the degree of stereo expansion. Additionally, one of four filter

characteristics can be selected for the 3D processing, using the 3DFILT control bits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

MODE3D

Playback/Record 3D select

0 = 3D selected for Record

1 = 3D selected for Playback

3DUC

Upper Cut-off frequency

0 = High (2.2kHz at 48kHz

sampling)

1 = Low (1.5kHz at 48kHz sampling)

3DLC

Lower Cut-off frequency

0 = Low (200Hz at 48kHz sampling)

1 = High (500Hz at 48kHz sampling)

4:1

3DDEPTH

[3:0]

0000

Stereo depth

0000: 0% (minimum 3D effect)

0001: 6.67%

....

1110: 93.3%

1111: 100% (maximum 3D effect)

R16 (10h)

3D enhance

3DEN

3D function enable

1: enabled

0: disabled

Table 13 3D Stereo Enhancement Function

When 3D enhancement is enabled (and/or the graphic equaliser for playback) it may be necessary to

attenuate the signal by 6dB to avoid limiting. This is a user selectable function, enabled by setting

ADCDIV2 for the record path and DACDIV2 for the playback path.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

ADCDIV2

ADC 6dB attenuate enable

0 = disabled (0dB)

1 = -6dB enabled

R5 (05h)

ADC and DAC

control

DACDIV2

DAC 6dB attenuate enable

0 = disabled (0dB)

1 = -6dB enabled

Table 14 ADC and DAC 6dB Attenuation Select

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