automatic mode changing method for car audio system with hands-free therein

The present invention is a mode to be converted automatically, the mode between the audio mode and a hands-free mode in accordance with whether a voice signal output from the mobile phone in a hands free integrated car audio system made by combining the hands-free function organically and car audio function automatically It relates to a conversion method. The present invention relates to a mode conversion method of a hands-free mode and a car audio system, a hands-free integrated car audio system provided with a mode conversion function for instructing a switch between the audio mode to output audio source for outputting the received audio from the mobile phone, mobile phone from determining whether a DTMF tone signal that is input; If the DTMF tone signal from the mobile phone type when receiving the speech signal level from the stage, and cell phones for converting a current mode of the hands-free mode is that the predetermined reference level less than the time for more than a predetermined reference time, the audio from the current mode, and including the step of automatically switches to the mode is characterized in that is made. Hands-free, built-in, car audio