WM8962B datasheet(103/295 Pages) WOLFSON

103 / 295 page

WM8962

Rev 4.3

103

VIRTUAL SURROUND SOUND (VSS)

VSS

HD Bass

DRC

DAC Signal Enhancement path

DAC

ReTune™

Second Order

HPF

5-band EQ

The Virtual Surround Sound (VSS) function is part of the DAC Signal Enhancement path.

Virtual Sound Sound (VSS) is a digital processing function that creates a perception of wider speaker

separation, generating a rich and immersive listening experience. It is aimed at portable applications,

but is effective on larger systems also. Note that VSS is not suited to single-speaker systems, nor to

headphone outputs.

Portable applications, where the speaker separation is small, suffer from significant acoustic crosstalk,

where the Right speaker output is heard strongly in the Left ear, and vice versa. The VSS algorithms

are designed to minimise these crosstalk effects, thus increasing the stereo experience. The VSS

process is finely tuned to produce a compelling three-dimensional experience, but without the listening

fatigue associated with some other stereo enhancement systems.

The VSS algorithms (and the user perception) are most effective at high frequencies; low frequency

content is therefore configured to bypass the VSS crosstalk processing. The crossover frequency (for

the low-frequency bypass) is adjustable, enabling the user to trade-off the stereo widening effect

against the required degree of integrity in the original audio.

The VSS algorithms are programmable and can be optimised for specific application or user

geometries. It is recommended to use the DAC HPF in conjunction with VSS in order to prevent

distortion and speaker damage.

Before VSS is enabled, it must be initialised and configured using the DSP2_ENA bit described in

Table 57. Note that this bit only needs to be enabled once before using any or all of ADC ReTune,

DAC ReTune, DAC HPF, VSS or HD Bass.

Note that specific sequences must be followed when enabling or configuring ADC ReTune, DAC

ReTune, DAC HPF, VSS, and HD

Bass sound enhancement functions (see “Enable Sequence -

Enhancements Initially Disabled

”).

VSS is enabled using the VSS_ENA register bit as described in Table 57.

It is possible to configure the VSS function to create a stereo effect that is optimised and tailored

specifically for a particular application. For the derivation of the VSS configuration parameters in

registers R20992 to R21139, refer to the WISCE configuration tool supplied with the WM8962

Evaluation Kit. Note that DSP2_ENA must be enabled before there is any type of access of any of the

parameters associated with VSS.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R768 (R300h)

DSP2 Power

Management

DSP2_ENA

DSP2 Audio Processor Enable.

0 = Disabled

1 = Enabled

This bit must be set before any of

ADC ReTune, DAC ReTune, DAC

HPF, VSS or HD Bass is enabled. It

must remain set whenever any of

these functions is enabled.

R16389

(4005h)

SOUNDSTAG

E_ENABLES_

VSS_ENA

Virtual Surround Sound (VSS)

enable

0 = Disabled

1 = Enabled

Table 57 Virtual Surround Sound (VSS) Enable

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