| 摘要 |
A hands-free device 1 comprises a cellular phone 90 of a driver, driver's speakers 11e that output sounds to the driver, front speakers 11a and 11b and rear speakers 11c and 11d that output sounds widely in a car, a detection unit 13 that outputs a detection signal to indicate whether there is a fellow passenger in the car or not, and control equipment 10 that communicate with the cellular phone 90, in the case that the control equipment 10 receives telephone communication voice signal indicating telephone conversation voice of other party of the telephone conversation from the cellular phone 90, based on the detection signal outputted from the detection unit 13, when the control equipment 10 judges that there is no fellow passenger, the control equipment has the telephone conversation voice outputted mainly from the front speakers 11a and 11b and the rear speakers 11c and 11d, and when the control equipment judges that there is a fellow passenger, the control equipment has the telephone conversation voice outputted mainly from the driver's speakers 11e.
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