| 摘要 |
PROBLEM TO BE SOLVED: To surely suppress useless power consumption of radio headphones used in a vehicle compartment. SOLUTION: A navigation system 1 having a main body unit 2 for reproducing multimedia data including mutually associated video and sound and outputting a video signal and a sound signal, and a rear monitor unit 3 for displaying video on the basis of the video signal outputted from the main body unit 2 is provided with a radio transmitting part 302 for transmitting the sound signal outputted from the main body unit 2 by radio, and headphones 4 for receiving the sound signal transmitted by radio from the radio transmitting part 302 and outputting sound, and switches the power source of the headphones 4 in accordance with an operating state of the rear monitor unit 3. COPYRIGHT: (C)2008,JPO&INPIT
|
