WM9714CLGEFLSLASHV datasheet(39/120 Pages) CIRRUS

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WM9714L

Rev 4.0

TONE CONTROL / BASS BOOST

The WM9714L provides separate controls for bass and treble with programmable gains and filter

characteristics. This function operates on digital audio data before it is passed to the audio DACs.

Bass control can take two different forms:



Linear bass control: bass signals are amplified or attenuated by a user programmable gain.

This is independent of signal volume, and very high bass gains on loud signals may lead to

signal clipping.



Adaptive bass boost: The bass volume is amplified by a variable gain. When the bass

volume is low, it is boosted more than when the bass volume is high. This method is

recommended because it prevents clipping, and usually sounds more pleasant to the

human ear.

Treble control applies a user programmable gain, without any adaptive boost function.

Treble, linear bass and 3D enhancement can all produce signals that exceed full-scale. In order to

avoid limiting under these conditions, it is recommended to set the DAT bit to attenuate the digital

input signal by 6dB. The gain at the outputs should be increased by 6dB to compensate for the

attenuation. Cut-only tone adjustment (i.e. bass and treble gains

≤ 0) and adaptive bass boost cannot

produce signals above full-scale and therefore do not require the DAT bit to be set.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

20h

DAC Tone

Control

Bass Mode Control

0 = Linear bass control

1 = Adaptive bass boost

Bass Cut-off Frequency Control

0 = Low (130Hz at 48kHz sampling)

1 = High (200Hz at 48kHz sampling)

11:8

BASS

1111 (off)

Bass Intensity Control

BB=0

0000 = +9dB

0001 = +9dB

… (1.5dB steps)

0111 = 0dB

… (1.5dB steps)

1011-1110 = -6dB

1111 = Bypass (off)

0000 = +9dB

0001 = +9dB

… (1.5dB steps)

0111 = 0dB

… (1.5dB steps)

1011-1110 = -6dB

1111 = Bypass (off)

DAT

Pre-DAC Attenuation Control

0 = 0dB

1 = -6dB

Treble Cut-off Frequency Control

0 = High (8kHz at 48kHz sampling)

1 = Low (4kHz at 48kHz sampling)

3:0

TRBL

1111 (off)

Treble Intensity Control

0000 = +9dB

0001 = +9dB

… (1.5dB steps)

0111 = 0dB

… (1.5dB steps)

1011-1110 = -6dB

1111 = Bypass (off)

Table 17 DAC Tone Control

Note:

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

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