fungsi dari IR transmitter dan IR receiver pair?

IR Transmitter and receiver are used to control any device wirelessly, means remotely. TV remote and TV are the best example of IR transmitter and receiver. TV generally consist TSOP1738 as the IR receiver, which senses modulated IR pulses and convert them into electrical signal. Here in our circuit we are building IR remote and its receiver.  We are using IR LED as transmitter and TSOP1738 as IR receiver.