CIRCUIT BOARD FOR MOBILE COMMUNICATION TERMINAL HAVING ULTRASONIC WAVE SPEAKER SYSTEM

摘要

Disclosed is a mobile communication terminal board having an ultrasonic speaker system which can be used without any separate additional device during a viewing of a sky-wave broadcast or during a video calling and which can be free from an echo phenomenon. The mobile communication terminal board includes a baseband chip for processing audio data, an ultrasonic drive chip for receiving and modulating a signal output from the baseband chip to an ultrasonic band signal, and an ultrasonic speaker for outputting the ultrasonic signal output from the ultrasonic drive chip to an outside.