| 摘要 |
PURPOSE: An ultrasonic wave speaker system and resonant frequency detecting method thereof are provided to install a digital signal processing module for an ultrasonic wave speaker, thereby detecting a resonant frequency suitable for a transducer. CONSTITUTION: An audio signal processing unit(110) converts an inputted analog audio signal into a digital signal. An ultrasonic wave generating unit(120) generates a digitally processed ultrasonic wave with a resonant frequency suitable for a transducer. An ultrasonic wave mixing unit(130) combines two signals received from the audio signal processing unit and the ultrasonic wave generating unit. An amplifier(140) amplifies an analog signal outputted from the ultrasonic wave mixing unit. A power controller(150) controls the power of the ultrasonic wave mixing unit according to a command for maximum limit power from a high power processing unit(145). |
