| 摘要 |
PURPOSE: To transmit a control signal not affected by a switching frequency signal under a high frequency fluorescent light. CONSTITUTION: An oscillator 35 oscillating a single frequency signal and a frequency divider 36 dividing the oscillated frequency are arranged to a transmitter 30. The transmitter 30 modulates a control signal with two kinds of frequencies and sends them alternately and repeatedly to a receiver 31. The 31 demodulates the control signals individually respeatedly and outputs to a device to be controlled alternately. Even when a switching frequency of an inverter driven fluorescent light 83 is close to either of the frequencies, the control signal modulated by the other frequency is not affected by the switching frequency. Thus, the normal control signal is outputted to the device to be controlled. |
