| 摘要 |
The invention relates to a sound system for a motor vehicle and to a process for specifying the functional scope of such. The sound system ( 1 ) for a motor vehicle comprises a control unit ( 2 ), and several input units ( 3, 3 a) for operating the system ( 1 ), as well as display units ( 4 ) and several units ( 5, 11 ) to generate the source data in the form of sound or video data. The sound data are amplified in an amplifier unit ( 6 ), and are conducted to several loudspeakers ( 7 ). The units are linked to one another via a bus ( 8 ) with a ring topology. Both source data and control data are transmitted over the bus. The functional scope of the individual input units ( 3, 3 a) is specified by means of a priority value of the input units ( 3, 3 a). This priority value is stored in the memory ( 12 ) of each input unit ( 3, 3 a). A control command containing this priority value causes the other units of the system ( 1 ) to form a priority-dependent functional scope, which represents a subset of the entire functional scope of this unit, and to transmit this back to the respective input unit ( 3, 3 a). The latter then generates its functional scope from the priority-dependent functional scopes that have been conducted to it. This functional scope then comprises all functionalities which can be invoked through this input unit ( 3, 3 a). Since the various input units ( 3, 3 a) have different priority values, they also have different functional scopes. As a result, collisions in the control of the system are essentially eliminated.
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