WM9713 datasheet(37/111 Pages) WOLFSON

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Preliminary Technical Data

WM9713L

PTD, March 2004, Rev 2.2

3D STEREO ENHANCEMENT

The 3D stereo enhancement function artificially increases the separation between the left and right

channels by amplifying the (L-R) difference signal in the frequency range where the human ear is

sensitive to directionality. The programmable 3D depth setting controls the degree of stereo

expansion introduced by the function. Additionally, the upper and lower limits of the frequency range

used for 3D enhancement can be selected using the 3DFILT control bits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

40h

General

Purpose

3DE

(disabled)

3D enhancement enable

3DLC

Lower Cut-off Frequency

0 = Low (200Hz at 48kHz sampling)

1 = High (500Hz at 48kHz sampling)

3DUC

Upper Cut-off Frequency

0 = High (2.2kHz at 48kHz sampling)

1 = Low (1.5kHz at 48kHz sampling)

1Eh

DAC 3D

Control

3:0

3DDEPTH

0000

3D Depth

0000: 0% (minimum 3D effect)

0001: 6.67%

…(6.67% steps)

1110: 93.3%

1111: 100% (maximum)

Table 17 Stereo Enhancement Control

Note:

All cut-off frequencies change proportionally with the DAC sample rate.

VOICE DAC

VXDAC is a 16-bit mono DAC intended for playback of Rx voice signals input via the PCM interface.

Typically it is used at 8ks/s, but may be used at other sample rates up to 48ks/s.

The analogue output of VXDAC is routed directly into the output mixers. The signal gain into each

mixer can be adjusted at the mixer inputs using control register 1Eh.

When not in use the VXDAC can be powered down using the Powerdown register bit VXDAC

(register 3Ch, bit 12).

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