BLUETOOTH HANDS-FREE CAR KIT CAPABLE OF IMPROVING SOUND QUALITY OF A CALL BY REDUCING QUALITY DETERIORATION IN THE CALL AND A METHOD OF ADJUSTING THE SOUND QUALITY USING THE SAME

摘要

PURPOSE: A Bluetooth hands-free car kit capable of adjusting sound quality of a call and a method of adjusting sound quality using the same are provided to adjust a frequency response of a microphone in each frequency domain, thereby improving sound quality of a call.;CONSTITUTION: A digital signal processor (DSP) (330) receives a second Bluetooth signal via a Bluetooth communication unit from a mobile communication terminal. The DSP outputs a second audio signal included in the second Bluetooth signal. A sound quality adjusting unit (390) compares an average level of a first audio signal and to an average level of the second audio signal in each frequency domain. The sound quality adjusting unit adjusts a frequency response of a microphone according to a difference between the average levels. A speaker (350) outputs the second audio signal after receiving the second audio signal from the DSP.;COPYRIGHT KIPO 2013;[Reference numerals] (310) Bluetooth communication unit; (390) Sound quality adjusting unit; (AA) BT_1 (including AUDIO_1); (BB) BT_2 (including AUDIO_2); (CC) Second audio signal (AUDIO_2); (DD) Sweep signal; (EE) First audio signal (AUDIO_1); (M1) First communication terminal; (M2) Second communication terminal