WM9713L_06 WOLFSON [Wolfson Microelectronics plc], WM9713L_06 Datasheet - Page 35

• Manufacturer Part Number: WM9713L_06
• Description: AC 97 Audio + Touchpanel CODEC
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

Pre-Production
VOICE DAC
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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.
Table 18 Stereo Enhancement Control
Note:
1.
VXDAC is a 16-bit mono DAC intended for playback of Rx voice signals input via the PCM interface.
Performance has been optimised for operating at 8ks/s or 16ks/s. The VXDAC will function at other
sample rates up to 48ks/s, but this is not recommended.
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 18h.
When not in use the VXDAC can be powered down using the Powerdown register bit VXDAC
(register 3Ch, bit 12).
40h
General
Purpose
1Eh
DAC 3D
Control
REGISTER
ADDRESS
All cut-off frequencies change proportionally with the DAC sample rate.
13
5
4
3:0
BIT
3DE
3DLC
3DUC
3DDEPTH
LABEL
0
(disabled)
0
0
0000
DEFAULT
3D enhancement enable
Lower Cut-off Frequency
0 = Low (200Hz at 48kHz sampling)
1 = High (500Hz at 48kHz sampling)
Upper Cut-off Frequency
0 = High (2.2kHz at 48kHz sampling)
1 = Low (1.5kHz at 48kHz sampling)
3D Depth
0000: 0% (minimum 3D effect)
0001: 6.67%
…(6.67% steps)
1110: 93.3%
1111: 100% (maximum)
DESCRIPTION
PP Rev 3.0 June 2006
WM9713L
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