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1.9 AC-coupling

In some applications additional signal manipulations are desired. For this purpose an AC-coupling is

short condition the input-signal of the speaker-attenuator is available at the AC-outputs. The input-imped-

ance of this AC-inputs is 50k . In addition there are Mix inputs available. With this inputs it is possible to

mix an external signal to every speaker with a mixing ratio of 50% (see figure 14).

The source of front and rear speaker can be set independently.

As source is choosable :

- internal dc coupling (not recommended)

- external ac coupling using ACin pins

Figure 15. AC/DC-coupling

1.10 Front Speaker-Attenuator and Mixing

A Mixing-stage is placed after front speaker-attenuator and can be set independently to mixing-mode.

Having a full volume for the Mix-signal the stage offers a wide flexibility to adapt the mixing levels.

Figure 16. Output Selector

1.11 Audioprocessor Testing

processor testing byte, several internal signals are available at the Mix pin. During this mode the input

resistance of 100kOhm is disconnected from the pin. The internal signals available are shown in the Data-

byte specification.

Vref

Vref

left channel

right channel

SWin

ACinL

ACoutL

SWout

Front Fader

RearFader

Subwoofer Fader

Rear selector

Highpass

Lowpass

fr

flat

fr

flat

1

Front

From M I Xin

OutF

Volume

+15/-79dB

1dB step

Volume

+15/-79dB

1dB step

Highpass2