TDA7417 Datasheet, PDF (16/34 Pages) STMicroelectronics – Car radio audio processor

Description of the audioprocessor
TDA7417
4.5
Multistep and 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 Multistep and Softstep feature both kinds of clicks could be
reduced to a minimum and are no more audible. Multistep feature supports N dB change,
each step is 1dB;During 1dB transition, it will have 32 divisions if choosing softstep. The
blend-time from one step to the next is user selectable.
Figure 8. Soft Step and Multi Step timing
Soft Step (S.S.)
Multi Step (M.S.)
1dB
(2dB)
Blend
Time
NdB
1dB
Blend
Time
32 divisions
Multi Soft Step (M.S.S.)
1dB
Blend
Time
NdB
32 divisions
AC00062
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