| 摘要 |
The present invention relates to a neck wear type ultrasound speaker substitute for an earphone using an ultrasound directional speaker array. More particularly, the present invention relates to a neck wear type ultrasound speaker substitute for an earphone by non-linearly demodulating predictable sound signal of secondary wave due to interference between two ultrasounds when two ultrasounds having an adjacent frequency is generated in air. The neck wear type ultrasound speaker substitute for an earphone according to the present invention includes: a support part having a bending portion having a ″U″ shape so that a person wears by a neck and a speaker mounted in the support part to generate a sound. The bending portion includes an ultrasound signal processor and a charge power supply. The speaker includes two first sound generators disposed and hinged at both ends of the support part to change a radiation direction of the sound by folding a hinge and two second sound generators disposed between the bending portion and the support part to generate the sound in a fixed direction. A connection terminal for input audible signal is further provided at an end of the support part. |
