| 摘要 |
PURPOSE: A sound heterodyne apparatus is provided to generate a forward compress wave which is emitted toward the exterior from an interference region in a forward. CONSTITUTION: A system comprises a supersonic wave frequency emitter and a modulation part. The supersonic wave frequency emitter transmits a first and a second supersonic wave(30,32) into a resonance cavity(80). The modulation part is coupled to the supersonic wave frequency emitter, and generates a second supersonic wave frequency which has a difference in a size in connection with a first supersonic wave frequency of the same as at least one audible frequency. At least one audible frequency is indirectly generated from the resonance cavity(80) by use of at least two supersonic waves(30,32) having different frequencies.
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