9
MOST Bus Diagnosis
Audio Master
As audio master, the ASK has the task to collect and process all the audio signals of the
vehicle and to distribute them to their destinations.
The ASK controls all the acoustic requests from the Control Display. The changes in the
level of a signal is not sudden, but smooth, e.g. during suppression, insertion and fading
out or temporary suppression of the signal at the destination: Because of this, a high-qual-
ity acoustic sound is obtained.
The ASK also assumes the generation and preparation of different acoustic signals, e.g.
PDC signals and warnings. In the event of a request for a warning or caution signal from
a control unit, the ASK provides a clean acoustic change of the signals.
Audio data
All audio data from any control unit are converted by the ASK into digital audio AF
format at a sampling rate of 44.1 MHz.
Categorization of audio sources
All possible audio sources are divided into different groups according to priority. Warning
signals have priority over any other audio source. Mixing of lower priority audio signals
(e.g. navigation, radio) is possible.
Generation of acoustic gongs
These are acoustic alarm signals which help the driver perceive sounds according to a
system. The different sounds, requested by the different control units, (e.g. gongs, PDC,
etc.), must be generated only in association with a visual indication. These come from
the instrument cluster and the Control Display.
The following sounds can be generated in the ASK.
Beeping for the PDC.
Various Check Control and warning gongs.
Note:
A maximum of three sounds can be produced at once. Sounds are produced in order of
importance. Sounds requested exceeding three will be lost.
Connection Master
As connection master, the ASK must provide channels to the equipment connected to the
bus and distribute the audio signals on the outputs (loudspeakers).
The connection master also controls the basic Hi-Fi or the LOGIC 7 Hi-Fi amplifiers.
