GF82.61-P-2005TW Route Guidance Through Voice Output
GF82.61-P-2005TW Route Guidance Through Voice Output
- with CODE (525) MB Audio 50 APS radio
Voice output, function
The destination-oriented navigation of the navigation system is considerably supported by the following voice outputs:
^ Directional instructions
^ Name of the road to turn into
The compass direction is specified in case of streets without a name.
No compass direction is specified in case of streets (e.g. in towns) which are designated by a name
Voice data are originally stored as individual word segments on the navigation CD. This data record is transferred automatically from the navigation CD to the navigation processor where it is stored.
The navigation processor combines these word segments into complete instructions or information. Moreover, signals are generated that are forwarded via the Media Oriented System Transport (MOST) to the audio gateway control unit (N93/1) where they are amplified and then output via the vehicle speakers.
Several driving recommendations in quick succession are combined into a single voice output.
The data of the voice output are transmitted in the radio control panel and navigation unit (A2/56) by the navigation CD into the navigation processor where they are stored in a memory.
While the national language is being loaded from the navigation CD, it is necessary to avoid severe physical shocks (e.g. bad road conditions). Otherwise voice output may be given in fragments. In such an instance the national language should be loaded again.
Control of voice output
If an emergency message is transmitted, the voice output consists only of this message as this has absolute priority and must not be interrupted by any other message. If the volume is changed during a navigation voice output, then this value is used as a guideline value during the next navigation voice output.
The following options are available for setting the volume:
^ Setting a value between the audio source and the voice output.
^ Setting the value between the voice output and the audio source.
^ If the volume of the audio source is lower than the voice output to be listened to, the volume of the audio source is not changed.
^ If the volume of the audio source is the same or higher, it is set to a lower volume for the duration of the voice output. If the voice output is completed, the volume of the audio source is reset to its prior volume.
^ The voice output can also be completely faded out.
The volume of the voice output has a minimum and a maximum value. It is not possible to leave the range between these values while making manual adjustments during the voice output.
After voice output has been completed, the set value remains stored for the next voice outputs.
Voice output mute circuit
The navigation voice output can be muted by pressing the "MUTE" button for t ≤ 2 s during a voice output. In the process, a window appears in the display with the content "Driving instructions muted". Muting is only valid for the current voice output. The voice output is activated:
^ By repeatedly pressing the "MUTE" button
^ By pressing the "NAV" button
^ By switching the radio control panel and navigation unit on and off
^ By switching the navigation on and off
^ Automatically after completion of the current destination- oriented navigation
If a traffic announcement can be heard simultaneously with the voice output, the traffic announcement is muted using the "MUTE" button when the button is pressed for the 1st time.
When the button is pressed for the 2nd time, the voice output is muted.
Dynamic route guidance, function
Position finding is the calculation of the vehicle's current position. It is activated when the driver door is opened or with "Circuit 15R ON" and the calculation is performed by the navigation processor of the radio control panel and navigation unit. The software is loaded during the switch-on phase and only the basic position finding is available. With "Circuit 15C" all important location finding parameters are stored during a run-on time of t = 30 min. In order to ensure very accurate and reliable position finding, 3 procedures which mutually complement each other are used for continuous position finding. These methods are:
^ Basic position finding
^ Map-based position finding
^ Global Positioning System (GPS) position finding
For a manual input of the vehicle location, it is possible to manually enter the location at the radio control panel and navigation unit. This can be useful after transporting the vehicle, if there had not yet been any GPS reception at the start of a journey.
