MULTIFUNCTION EARPHONE USING IN THE MOBILE TERMINAL

摘要

PURPOSE: A multifunctional earphone is provided to improve reception sensitivity by installing a low bandwidth filter in a voice signal movement path. CONSTITUTION: A low pass filter(33b) is located in a voice signal movement route. The low pass filter separates the signal wire in a speaker side from the signal wire of a mobile device. A high frequency radio signal is received by forming an antenna by using the signal wire in a speaker side and the signal wire in a mobile device. A low noise amplifier(33d) is located in a high-frequency reception route in order to low noise-amplify a high frequency radio signal. An impendence matching line(33c) is located between the low noise amplification part and the signal wire in a speaker side in order to execute an impedance matching process. An earphone circuit part(33a) transmits a voice signal received from the mobile device to the speaker.