| 摘要 |
PURPOSE:To improve reliability of a remote controller of an electric device, by converting the infrared rays which are radiated after being applied with modulation alternately by two different frequencies to convert into an electric signal, and detecting at a filter to apply a logical process, and then driving a relay. CONSTITUTION:Two frequencies f1 and f2 are delivered alternately from two oscillating circuits of a transmitter 1, and the infrared rays are irradiated from a light emitting diode. A detecting circuit 2 receives the infrared rays and converts them into electric signal. These signals are amplified by an amplifying circuit 3, and then the output is supplied to filter circuits 4 and 5. The circuits 4 and 5 detect the frequencies f1 and f2 and at the same time performs demodulation to supply the output of the demodulation to a logical circuit 6. The circuit 6 performs a control to obtain the same phase for the output. The output receives a logical operation at an NAND gate and is delivered to a relay driving circuit 7. The circuit 7 controls a stepping relay to have a prescribed remote control. |
