Voice output, function - GF82.85-P-3001AB
MODELS 215, 220 with CODE (352) COMAND operating and display system with CODE (494) USA version
Illustrated with following equipment specification:
- Code (810) Sound system up to 31.8.03
In vehicles as of 01.09.03, all audio signals, voice signals and navigation processor (N41/1) signals are transferred via the Media Oriented System Transport (MOST).
As of 1.9.03 the navigation processor (N41/1) is installed as a separate control unit in the left of the engine compartment.
When using the navigation system, the user is much supported by voice output:
- Direction information
- Road numbers of national roads and highways
As of 01.06.01, specification of "compass direction" (north, south, east and west). No compass direction is specified in the case of streets (e.g. in towns) which are designated by a name.
The voice data is originally stored on the CD as individual word segments. This data record is transferred automatically from the CD to the navigation processor where it is stored in a non-volatile memory. The navigation processor links these segments to complete instructions or information and produces appropriate low frequency (LF) signals.
When required, the low frequency (LF) signals generated in this way are relayed via external cables to the COMAND audio signal processing system in analog format, amplified and output via the vehicle speakers.
If the vehicle is equipped with a code (810) sound system (see block diagram), the voice signals are placed on the Digital Data Bus (D2B) by the COMAND audio signal processing system, received and amplified by the sound amplifier (A2/13) and then output via the vehicle speakers.
Several driving recommendations in quick succession are combined into a single voice output.
Manual language loading
Status as of 01.06.01; COMAND features various languages:
- English
- English
- Italian
- French
- Spanish
- Dutch
These can be selected using the "System settings" menu. The data for voice output is transferred from the CD to the navigation processor where it is stored in a non-volatile memory. Language loading only takes a few seconds and modifies both the voice output and the menu texts on the display.
Voice loading takes place again automatically after a power disconnection.
Severe vibration (e.g. bad roads) must be avoided while a language is being loaded from the CD. Otherwise voice output might be fragmentary. If this is the case, the language must be reloaded.
Volume of voice output
The voice output volume can be adjusted during voice output. A difference of at least 12.5 dB is maintained between the volume of the current audio source and the voice output volume.
If the volume is turned down during voice output, for example, and the 12.5 dB difference to the audio signal becomes smaller, COMAND automatically reduces the level of the audio signal until the 12.5 dB difference is reached again.
After voice output has taken place the volume of the audio signal is increased to match that of the voice output.
The volume of the voice output cannot be reduced to below a certain minimum level.
Superimposition of voice output and an audio source.
If an audio source (e.g. CD, radio) is active at the same time as voice output, the two signal sources are superimposed.
Voice output mute circuit
The navigation voice output can be muted during voice output by pressing the mute button (button marked with struck-out speaker). The mute feature applies only for the current voice output.
| Route calculation, function | GF82.61-P-3011DA |