| 摘要 |
PROBLEM TO BE SOLVED: To attain sound volume control without a sense of incongruity with an inexpensive system. SOLUTION: This controller 10a is configured such that a setting sound volume of an acoustic unit provided in a vehicle interior is automatically adjusted. In this case, the controller 10a is provided with an engine number of revolution detection means 1 that detects the number of engine revolutions Nxi, an engine number of revolutions averaging means 2a that applies averaging to an increasing tendency of the number of engine revolutions Nxi when the number of engine revolutions Nxi is increasing on the basis of information detected by the engine number of revolutions detection means 1 to provide an output of number of engine revolutions Nyi, for setting an increasing sound volume unsharpened in the increasing tendency than the increasing tendency of the number of engine revolutions Nxi, an increasing sound volume setting means 3 that sets an increased sound volume ΔV set by the increasing sound volume setting means 3 in response to the number of engine revolutions Nyi, for setting an increasing sound volume, and a sound volume means 12 that controls a sound volume V of the acoustic unit on the basis of the increased sound volume ΔV set by the increasing sound volume setting means 3. |
