Description of the audioprocessor

TDA7417

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4.8

Highpass filter

The highpass filter has 2 order filter characteristics with programmable cut-off frequency

(80/120/160Hz)

Figure 15.

Highpass Control

4.9

Output Selector and Mixing

The output-selector allows different sources to connect to the front output. The setup of the

output selector is shown in Figure 16. A Mixing-stage is placed after the front speaker-

attenuator and can be set to mixing-mode.

In normal mode, switch (sw1) turns to down and main signal is directly outputted through

front pin. In the mixing mode, switch (sw1) turns up, mono differential signal and main signal

are mixed with ratio -6/-6dB. Having a full volume-attenuator for the mix-signal, the stage

offers a wide flexibility to adapt the mixing levels.

Figure 16.

Output Selector

Rear

Main

Mix_out

Attenuator

Attenuator

Attenuator

Attenuator

SW

sw

1

-6/-6

dB

Mono

Differential