| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an on-vehicle audio unit by which a user can stably use a headphone system even when the user is apart from a vehicle. SOLUTION: When a headphone device is in use, a control section 1' control an antenna changeover section 16 to throw connection of an antenna 12 to a position of a transmission section 11 and transmits an instruction of revision of a length of the antenna 12 to a power antenna control section 13. The power antenna control section 13 controls a motor (not shown) to set the length of the antenna 12 to a length suitable for the transmission, an audio processor 8 inputs an audio signal to be outputted from a loud speaker 10 to an amplifier 9 and allows the loud speaker 10 to output it, input the audio signal to a transmission section 11, which modulates the audio signal to a transmission signal and transmits the resulting signal to the headphone system 15.</p> |
