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TDA7407D Fiches technique(PDF) 15 Page - STMicroelectronics

No de pièce TDA7407D
Description  ADVANCED CAR SIGNAL PROCESSOR
PDF  34 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7407D Fiches technique(HTML) 15 Page - STMicroelectronics

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TDA7407D
6.4
TREBLE
There are two parameters programmable in the treble stage (see figs 17, 18):
6.4.1 Attenuation
Figure 17 shows the attenuation as a function of frequency at a center frequency of 17.5KHz.
6.4.2 Center Frequency
Figure 15 shows the four possible Center Frequency (10, 12.5, 15 and 17.5kHz).
6.4.3 AC Coupling
In some applications additional signal manipulations are desired, for example surround-sound or more-
band-equalizing. For this purpose a AC-Coupling is placed before the Speaker-attenuators, which can be
activated or internally shorted by Bit7 in the Bass/Treble-Configuration byte. In short condition the input-
signal of the speaker-attenuator is available at AC Outputs and the AC Input could be used as additional
stereo inputs. The input impedance of the AC Inputs is always 50K
Ω.
6.4.4 Speaker Attenuator
The speaker attenuators have exactely the same structure and range like the Volume stage.
Figure 10. Bass Control @ fc = 80Hz, Q = 1
Figure 11. Bass Center @ Gain = 14dB, Q = 1
Figure 12. Bass Quality factors @ Gain = 14dB,
fc = 80Hz
Figure 13. Bass normal and DC Mode @ Gain =
14dB, fc = 80Hz
-15.0
-10.0
-5.0
0.0
5.0
10.0
15.0
10.0
100.0
1.0K
10.0K
0.0
2.5
5.0
7.5
10.0
12.5
15.0
10.0
100.0
1.0K
10.0K
0.0
2.5
5.0
7.5
10.0
12.5
15.0
10.0
100.0
1.0K
10.0K
0.0
2.5
5.0
7.5
10.0
12.5
15.0
10.0
100.0
1.0K
10.0K
Note: In general the center frequency, Q and DC-mode can be set
independently. The exception from this rule is the mode (5/xx1111xx)
where the center frequency is set to 150Hz instead of 100Hz.
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