| 摘要 |
PURPOSE:To make a receiver into an optimum receiving condition so that the influence from peripheral lighting equipment can be minimum by matching with the conditions of the lighting equipment where the receiver is provided. CONSTITUTION:A filter circuit 3 to change a passing band and a frequency deciding circuit 6 are provided. When a frequency is low (when lighting equipment is commercial lighting), a transistor Tr1 is off (for example, 20kHz or below) by the frequency deciding circuit 6. When the frequency is high (when the lighting equipment is high frequency lighting), a transistor Tr1 is on (for example, 20kHz or above), and the lighting frequency of the lighting equipment is stopped by the filter circuit 3. |
