TDA7419_09 Datasheet, PDF (19/40 Pages) STMicroelectronics – 3 band car audio processor

TDA7419
Figure 7. Soft-mute timing
Description of the audio processor
4.5.1
4.6
1
EXT.
MUTE
+SIGNAL
REF
-SIGNAL
1
I²C BUS
OUT
D97AU634
Time
1. Please notice that a started mute-action is always terminated and could not be interrupted by a change of
the mute -signal
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
V_OUT
1dB
0.5dB
-0.5dB
SS Time
Time
-1dB
D00AU1170
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.
Bass
There are four parameters programmable in the bass stage:
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