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TDA7404DTR データシート(PDF) 17 Page - STMicroelectronics

部品番号 TDA7404DTR
部品情報  Car radio signal processor
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7404DTR データシート(HTML) 17 Page - STMicroelectronics

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TDA7404
Description of functionality
17/35
4.6
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. Four programmable soft step time from one
step to the next, are user selectable.
Figure 9.
Soft-step timing
1.
For steps more than 1 dB the soft-step mode should be deactivated because it could generate a 1 dB error
during the blend-time.
4.7
Bass
There are three parameters programmable in the bass stage:
4.7.1
Attenuation
Figure 10 shows the attenuation as a function of frequency at a center frequency of 80Hz.
Figure 10.
Bass control @ fC = 80 Hz, Q = 1
Time
SS Time
-1dB
-2dB
Vout
2dB
1dB
-15.0
-10.0
-5.0
0.0
5.0
10.0
15.0
10.0
100.0
1.0K
10.0K
dB
Hz


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