| 摘要 |
An ultrasonic speaker system is provided to correct the phase of a sound wave by making the phases of sound waves emitted from a radiation plate, different at the angle of 180 degrees, through an uneven part formed on one surface of the radiation plate, and simplifying the manufacturing process. An ultrasonic speaker system includes a signal processing module for processing an input signal, a signal amplifier for amplifying a signal generated from the signal processing module, and an ultrasonic generator(30) for generating ultrasonic sound pressure by the signal amplified in the signal amplifier. The ultrasonic generator includes a radiation plate(31) having recessed and protruded parts(32a,32b) formed on at least one surface. The natural frequency of the ultrasonic generator is 20 to 40kHz. |
