Patent ID: 6965787

Claim:
A hands-free device for enabling a driver to have a hands-free telephone conversation using a cellular phone in a car, said hands-free device comprising: a first speaker operable to output sound to the driver; a second speaker operable to output sound widely in the car; a detection unit operable to output a detection signal indicating whether there is a fellow passenger in the car or not; and a control unit operable to communicate with the cellular phone, and operable to judge whether there is a fellow passenger in the car or not based on the detection signal outputted from said detection unit, wherein, when said control unit judges that there is no fellow passenger in the car, upon receiving a telephone conversation voice signal indicating a telephone conversation voice of an other party of the telephone conversation, said control unit is operable to have the telephone conversation voice outputted in a wide range in the car mainly from said second speaker, and restrain the telephone conversation voice to be outputted from said first speaker, and wherein, when said control unit judges that there is a fellow passenger in the car, upon receiving the telephone conversation voice signal indicating the telephone conversation voice of the other party of the telephone conversation, said control unit is operable to have the telephone conversation voice outputted toward the driver mainly from said first speaker, and restrain the telephone conversation voice to be outputted from said second speaker.