> 3.7 | Audio Interface

> The audio interface provides one analog input for a microphone and one analog output for an earpiece.

> • | The microphone input and the earpiece output are balanced.

> • | For electret microphones a supply source is implemented.

> • | The microphone supply characteristics are optimized for the recommended Votronic handset. For ordering Information see Chapter 7.

> • | This handset has been used for the reference handset for type approval. An extra approval must be obtained for integrating other handsets or amplifiers.

> The amplification of sending direction, receiving direction and sidetone depends on the current audio mode.
> EMC immunity complies with the vehicular environment requirements according to EN 301 489-7.
> Figure 8: Audio Western plug (4-pole female)
> Figure 9: Audio block diagram