| 摘要 |
PROBLEM TO BE SOLVED: To allow an oscillation circuit to be shared when a frequency used for smart operation and a frequency used for immobilizer operation are different.SOLUTION: An on-vehicle system 10 includes: an on-vehicle oscillation circuit 12 which generates a carrier signal having a predetermined frequency; a multiplication circuit 31 which is switchable between a state in which the carrier signal generated by the on-vehicle oscillation circuit 12 is output the frequency unchanged and a state in which a frequency-multiplied signal is output instead of the carrier signal generated by the on-vehicle oscillation circuit 12; a mixer 32 which modulates the carrier signal output from the multiplication circuit 31 and outputs the modulated signal having been modulated to transmission antennas 11a, 11b; and an on-vehicle control unit 18 which controls the switching of the multiplication circuit 31. The on-vehicle control unit 18 changes the state of the multiplication circuit 31 so as to output the carrier signal generated by the on-vehicle oscillation circuit 12 during smart operation with the frequency unchanged, and also changes the state of the multiplication circuit 31 so as to output the frequency-multiplied signal during immobilizer operation. |
