| 摘要 |
PROBLEM TO BE SOLVED: To provide an in-vehicle radio noise reducing system with a simple structure capable of reducing radio noise caused by beat sounds which are generated by a power conversion device performing a switching drive at a predetermined frequency.SOLUTION: A radio noise reducing system mounted on a vehicle has a radio receiver that receives radio broadcast waves and a power conversion device that performs switching drive at a predetermined frequency. The radio noise reducing system includes: converter means that performs Fourier transform of a voice signal extracted from the radio broadcast wave received by the radio receiver in a frequency range; peak frequency detection means that detects a peak frequency which has strength higher by a predetermined threshold value or more with respect to the strength of a neighboring frequency in a frequency range obtained by the converter means; and equalizer means that reduces the output strength at the peak frequency detected by the peak frequency detection means. |
