TDA7419

Description of the audio processor

19/40

Figure 7.

Soft-mute timing

1.

Please notice that a started mute-action is always terminated and could not be interrupted by a change of

the mute -signal

4.5.1

Soft-step volume

When the volume level is changed audible clicks could appear at the output. The root cause

of those clicks

could either be a DC-Offset before the volume-stage or the sudden change of the envelope

of the audiosignal. With the soft-step feature both kinds of clicks could be reduced to a

minimum and are no more audible. The blend-time from one step to the next is

programmable in four steps.

Figure 8.

Soft-step timing

1.

For steps more than 0.5dB the Soft-step mode should be deactivated because it could generate a hard

1dB step during the blend-time.

4.6

Bass

There are four parameters programmable in the bass stage:

1

EXT.

MUTE

+SIGNAL

REF

-SIGNAL

1

I

OUT

Time

D97AU634

1dB

0.5dB

-0.5dB

-1dB

Time

D00AU1170

SS Time