Voice output, function with code 171.4 - GF82.85-P-3001SK

MODEL 171.4 with CODE (525) MB Audio 50 APS radio

MODEL 171.4 with CODE (527) COMAND APS with single DVD drive (with navigation)

The navigation processor of the radio and navigation unit (A2/56) with code (525) Audio 50 APS MB radio is integrated into the control unit. On the COMAND operating, display and control module (A40/3) with code (527a) COMAND APS (with navigation) the external navigation module is called navigation processor (N41/1).

The navigation system route guidance (based on DVD data) is supported significantly by voice output:

Direction information
Name of street at which to turn

For streets without names, the "compass direction" (north, south, east and west) is specified. The compass direction is omitted in the case of streets (e.g., in towns) which are designated by a name.

The voice data is originally stored in the form of individual word segments on the navigation DVD-ROM. This data record is automatically transferred from the DVD-ROM to the navigation processor (N41/1) and stored there. The navigation processor (N41/1) links these word segments into complete instructions or information and generates corresponding signals. If required the signals thus generated are passed on via MOST (media oriented system transport) to the audio signal processing in the audio gateway control module (N93/1), are amplified there and then output via the vehicle loudspeakers.

Several driving recommendations in quick succession are combined into a single voice output.

Manual language loading from DVD-ROM

The system has 5 different languages:

German
English
French
Italian
Spanish

In the menu "SERV/Speech", the data of the voice output of the DVD-ROM can be transmitted to the navigation processor (N41/1) where they are stored in a non-volatile memory.

Loading a language requires several seconds and changes the voice output as well as the menu texts on the display. Voice loading takes place again automatically after a power disconnection.

While a language is being loaded from the DVD-ROM, severe vibrations (e.g. bad road conditions) should be avoided. Otherwise the voice output might be broken up. In such cases it is necessary to reload the language.

Control of the navigation system voice output

If a major emergency message is transmitted, the audio output consists only of this message as this has absolute priority and must not be interrupted by any other message. If the volume is altered during a navigation system voice output, this is regarded as the absolute level for the next navigation system voice output.

For the volume setting, the following options exist:

Setting of a minimum differentiation between the audio source volume and the navigation voice output
Setting of a minimum differentiation between the navigation voice output and the audio source
If the volume of the audio source is less than the navigation voice output to be heard, the level of the audio source does not change.
If the level of the audio source is the same or louder, it is set below the level of the navigation voice output to be heard at that moment during the voice output of the navigation system. As soon as the voice output is ended, the volume of the audio source is restored to the original setting prior to the voice output.
Both the audio source and the navigation voice output can have the same volume, or the navigation voice output can be faded out completely.

The navigation voice output has the basic values minimum and maximum level. The volume cannot be set below the minimum level or above the maximum level during the navigation system voice output.

After the end of the navigation voice output in this case the minimum noise level or maximum noise level remains adjusted for the next navigation voice outputs.

Voice output mute circuit

The navigation voice output can be muted by pressing the "MUTE" button for t ≤ 2 seconds during a voice output.

The mute feature applies only for the current voice output. If the "MUTE" button is operated for t ≥ 2 s, a window appears in the screen: "Driving Instructions Muted".

Activating voice output:

By repeatedly pressing the "MUTE" button
By pressing the "NAV-Repeat" button
By switching the system off and on
By switching the navigation off and on
Automatically at the end of the current route guidance

If a traffic announcement is heard simultaneously with a navigation voice output, the traffic announcement is muted when the "MUTE" button is pressed for the first time and the navigation voice output is muted when the MUTE button is pressed for the second time. The Mute state for a traffic announcement only applies to the current announcement.

GPS antenna, location/purpose

GF82.62-P-4107SK