| 摘要 |
A vibrational device has a vibration generator (VG) (2,3) for generating acoustic waves in a non-audible range and an acoustic sonic resonator (ASR) (1) coupled to the VG. A ceramic/plastic casing surrounds the VG and the ASR and has a six-point axis of symmetry. The VG is formed by a piezoelectric loudspeaker (2) and a frequency generator (3) linked to it.
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