| 摘要 |
A parametric speaker comprises a generally planate radiating element (12), suitable for radiating ultrasonic vibrations into a fluid medium, and an emitter (14), having an ultrasonic output and/or resonant frequency, the emitter being intimately coupled to the radiating element. The radiating element is physically configured to have a mechanical resonance that substantially matches the output and/or resonant frequency of the emitter. |
