INFRARED RECEIVER FOR DUAL CHANNEL AND INFRARED REMOTE CONTROL SYSTEM FOR DUAL CHANNEL COMPRISING THE SAME

摘要

An infrared receiver for dual channel and an infrared remote control system for dual channel comprising the same are provided to receive two infrared carriers having the different carrier frequency. A signal detection unit(310) detects infra-red signal. An amplifier amplifies and receives the output signal of the signal detection unit. A variable gain amplifier(330) controls the size of the signal voltage by the desired signal level by the automatic gain control the output signal of amplifier. A first band pass filter(341) passes through only the first carrier frequency component. The second band pass filter(342) passes through only the second answer frequency component. A first envelope signal detection unit(351) receives the first bandpass filter output signal and extracts the envelope signal. The second envelope signal detection unit(352) receives the second band pass filter output signal and extracts the envelope signal.