| 摘要 |
PROBLEM TO BE SOLVED: To enable voice to be automatically adjusted to an optimal volume level to be outputted without compelling a user to perform an complicated operation, even when voice is outputted from a portable audio player PA connected through a front external input terminal 15. SOLUTION: In the present invention, a reproduced voice signal S20 is inputted from a portable audio player PA connected through a front external input terminal 15 provided in a body portion 2, the reproduced voice signal S20 is converted into spectrum analyzer data SA, an input voltage level VL in the vicinity of a center frequency in the spectrum analyzer data SA is compared with a reference voltage level RF preset by the body portion 2, and a volume level of the voice based on the reproduced voice signal S20 to be outputted through the body portion 2 according to the comparison result is controlled by a fader adjusting portion 23C. COPYRIGHT: (C)2009,JPO&INPIT
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