Patent ID: 6972661

Claim:
An anti-interference relay device for signal transmission comprising: a receiving module adapted to receive an infrared (IR) signal from a remote controller, wherein the receiving module comprises: a first microprocessor connected to an IR sensor, a radio frequency (RF) signal modulating unit and a microstrip antenna, wherein after the IR sensor receives the IR signal, the IR signal and an identification code are modulated by the RF signal modulating unit to a RF signal and then output via the microstrip antenna; wherein if no IR signal is detected for a designated period, the receiving module returns to an idle mode to mitigate the power consumption; a transmitting module adapted to control an electrical appliance based on the RF signal, wherein the transmitting module comprises: a second microprocessor connected to a data receiving unit and an IR signal emitting unit, wherein when the RF signal is received by the receiving unit and then demodulated to the IR signal and the ID code, the microprocessor compares the demodulated ID code with a preset ID code stored in the transmitting unit; wherein if the demodulated ID code matches with the preset ID code, the IR signal is output by the IR signal emitting unit to control the electrical appliance, otherwise the IR signal is ignored; and wherein if the transmitting module receives no signal from the receiving module for a period, the transmitting module enters an idle mode to prevent interference to other electrical products.