| 摘要 |
When operation abnormality determination is performed for a first notification unit on the basis of the result of analysis of notification sound output from the first notification unit and it is determined that the first notification unit is operating normally, it is determined whether the SN ratio of the notification sound and ambient noise is at an allowable level. If it is determined that the first notification unit is not operating normally, or that the SN ratio is not at the allowable level, a passenger is notified of information by a second notification unit that notifies the information using senses other than hearing. |
