TDA7417 Просмотр технического описания (PDF) - STMicroelectronics

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производитель

TDA7417

Car radio audio processor

STMicroelectronics 

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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