| 摘要 |
The equipment (1) comprises first acoustic-electric transducers (2) for providing electrical signals indicative of the noise in a space in the motor vehicle, second electric-acoustic transducers (4), and an electronic unit (6) which, in a first operating mode, can pilot the second transducers (4) in dependence on the signals provided by the first (2) so as to cause the generation of pressure waves (anti-noise) which can cancel out the noise waves. The unit (6) can also selectively implement a second operating mode, alternative to the first, in which it pilots the second transducers (4) so as to cause the generation of pressure waves of predetermined characteristics in said space (3), it detects the signals correspondingly provided by the first transducers (2), it compares predetermined characteristics of these signals with those of reference signals or data previously stored, and it generates alarm and/or locking signals when the characteristics of the signals provided by the first transducers (2) differ from those of the reference signals or data so that, in the second operating mode, the equipment (1) operates as an alarm system against intrusions into said space (3). <IMAGE> |
