WM8602SEDSSLASHV datasheet(30/46 Pages) WOLFSON

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WM8602

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PP Rev 1.5 May 2004

Figure 20 Application and Release of Soft Mute

An auto-mute function is provided which automatically mutes the output stage when a digital silence

period is detected. Digital silence is defined as a consecutive period of 1024 zero input samples at

the output of the volume control. Auto-mute will be removed as soon as the volume control output

becomes non-zero. (Please note that on the sub channel the noise level is greatly reduced, rather

than complete digital silence.)

To achieve digital silence, you can do one of the following:

•

Turn on auto-mute and set the volume control to zero.

•

Turn on auto-mute and input zero data on the serial data input pins with the bass

management filters disabled. (Page 25)

•

Turn on auto-mute and soft mute.

The auto-mute operates independently for Left/Right and Subwoofer channels and can be enabled or

disabled separately.

The mute features maximize the SNR of the PWM amplifier system. Soft-mute will only maximize the

SNR for Left/Right or Subwoofer channels if enabled.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

SMUTE

Digital Soft Mute

0 = disable (signal active)

1= enable

AMUTEF

Left/Right Auto-mute

0 = disable

1 = enable

R12 (0Ch)

Mute

AMUTESB

Subwoofer Auto-mute

0 = disable

1 = enable

Table 34 Mute

-2.5

-2

-1.5

-1

-0.5

0.5

1.5

0.001

0.002

0.003

0.004

0.005

0.006

Time(s)

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