Datasheet

TDA7418 Description of the audioprocessor
15/29
4.5 SoftStep 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 audio signal. With the SoftStep-feature both kinds of clicks could be reduced to a
minimum and are no more audible.
Eight programmable softstep time from one step to the next are user selectable.
Figure 8. SoftStep timing
1. For steps more than 1dB the SoftStep mode should be deactivated because it could generate 1dB error
step during the blend-time.
4.6 Bass
There are four parameters programmable in the bass stage:
4.6.1 Attenuation
Figure 9 shows the attenuation as a function of frequency at a center frequency of 80Hz.
Figure 9. Bass control @ f
C
= 80Hz, Q = 1
1dB
0.5dB
-0.5dB
-1dB
Time
D00AU1170
V
OUT
SS Time