| 摘要 |
PROBLEM TO BE SOLVED: To promptly switch broadcast hierarchy selection while having high rationality in simple configuration. ! SOLUTION: Within a storage unit 180, a first buffer 181 and a second buffer 182 are disposed. The first buffer 181 stores reception quality of broadcast waves over a period of which the total period length is a first period length in the case where a vehicle velocity V is equal to or higher than a predetermined velocity. The second buffer 182 stores reception quality of broadcast waves over a period having a second period length shorter than the first period length in the case where A hierarchy selection is being implemented in which noise resistance is higher than B hierarchy broadcasting, and the vehicle velocity V is lower than the predetermined velocity. While the A hierarchy selection is implemented. Then, a control unit 190 performs control for switching from the A hierarchy selection to B hierarchy selection on the basis of the reception quality in the first buffer 181 in t |
