TDA7419_09 Datasheet, PDF (27/40 Pages) STMicroelectronics – 3 band car audio processor

TDA7419
Description of the audio processor
4.12
HPF applications
For HPF applications, HPF filter is available for additional processing after the speaker
control. It is a 2^nd order butterworth highpass filter with selectable flat mode. Figure 22
shows the diagram of the HPF that includes an external RC network.
Figure 22. HPF diagram
External RC network
ACOUT
/AC2OUT
SE3IN
/AC2IN
ACIN
/FILO
Gain Control
From speaker
To
output
4.13
Output selector and mixing
The output-selector allows the front and rear speakers to connect to different sources. The
setup of the output selector is shown in Figure 24. A Mixing-stage is placed after the front
speaker-attenuator and can be set to mixing-mode. Having a full volume-attenuator for the
mix-signal, the stage offers a wide flexibility to adapt the mixing levels.
Figure 23. Output selector
Mix_in
Attenuator
Main
Second
BassL+BassR
Attenuator
Attenuator
Subwoofer
filter
Attenuator
Front
Rear
Subwoofer
output
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