PROBLEM TO BE SOLVED: To maintain wakefulness of a driver by causing the driver to be aware of changes in sound characteristics.SOLUTION: A wakefulness maintaining device 100 maintains wakefulness of a person. A switching time control part 102 analyzes the characteristics of perceived sounds acquired by a microphone loaded inside a vehicle, and the perceived sounds include control sounds played back by the wakefulness maintaining device 100 and environmental sounds around the person when no control sounds are being played back. An in-car sound accumulating part 103 accumulates the perceived sounds, an acoustic pressure change setting part 105 sets a control method to be applied to the environmental sounds on the basis of the characteristics of the perceived sounds accumulated by the in-car sound accumulating part 103, and a control sound generating part 106 applies the control method set by the acoustic pressure change setting part 105 to the environmental sounds and generates the control sounds.COPYRIGHT: (C)2013,JPO&INPIT【課題】音の特性の変化を運転者に知覚させることにより、運転者の覚醒状態を維持させること。【解決手段】人の覚醒状態を維持する覚醒状態維持装置100であって、切替時間制御部102は、車両内部に搭載されたマイクによって取得される聴取音の特性を解析し、聴取音は、覚醒状態維持装置100が再生する制御音と制御音が再生されていない状態での人周辺の環境音とを含み、車内音蓄積部103は、聴取音を蓄積し、音圧変化設定部105は、車内音蓄積部103が蓄積した聴取音の特性を基に、環境音に適用する制御方法を設定し、制御音生成部106は、音圧変化設定部105が設定した制御方法を環境音に適用して制御音を生成する。【選択図】図1
