| 摘要 |
PROBLEM TO BE SOLVED: To improve the operability of an audio device on a vehicle by quickly confirming the adjusted tone quality characteristic of this audio device which has the tone quality characteristic adjusted by tone control. SOLUTION: A display face 11 is provided with a bass control key part 24'f and a treble control key part 24'g as operation parts for level control of bass and treble characteristics of sounds. Levels 27 and 28 of actual bass and treble characteristics adjusted by tone control are simultaneously displayed on a display picture 11 of a display device 10. |
