TDA7718B Datasheet, PDF (16/40 Pages) STMicroelectronics – 3 band car audio processor

Description of the audioprocessor
TDA7718B
4.2.3
High frequency boost
Figure 6 shows the different Loudness shapes in low and high frequency boost.
Figure 6. Loudness attenuation, f_c = 2.4 kHz





4.2.4
4.3
Note:

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Flat mode
In flat mode the loudness stage works as a 0 dB to -15 dB attenuator.
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Soft-mute
The digitally controlled soft-mute stage allows muting/demuting the signal with a I²C bus
programmable slope. The mute process can either be activated by the soft-mute pin or by
the I²C bus. This slope is realized in a special S-shaped curve to mute slow in the critical
regions (see Figure 7).
For timing purposes the bit 0 of the I²C bus output register is set to 1 from the start of muting
until the end of demuting.
Figure 7. Soft-mute timing

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Please notice that a started mute-action is always terminated and could not be interrupted
by a change of the mute –signal.
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