and more specifically includes the leader code the custom code a custom code verification byte the data code and a data code verification byte further each of the codes may have data of 2 bytes that is 8 bits and the infrared signal may include an ending signal bit 10 meanwhile the control data can be transmitted from the remote controller 400 to the receiving device 200 by being loaded on a carrier signal having a predetermined frequency and a predetermined duty ratio that is the remote controller 400 can generate a baseband signal as the control data corresponding to the operation of the external apparatus 300 which the user inputs and generate and transmit the infrared signal to the receiving device 200 by synthesizing the baseband signal with the carrier signal having the predetermined frequency and the predetermined duty ratio further the carrier signal may have a frequency of 30 khz to 60 khz and a duty ratio of 1 2 to 1 3 the signals transmitted from the remote control 400 to the receiving device 200 will hereinafter be referred to as remote control signal or infrared signal thus according to the embodiment of the present invention the infrared signal can be transmitted by synthesizing the baseband signal including the control data of the external apparatus 300 with the carrier signal having the frequency of 37 khz and the duty ratio 1 3 for example in the control data included in the baseband signal the leader code may be constituted by a high of 9 ms and a low of 4 5 ms bit u2018 1 u2019 may be constituted by a high of 0 56 ms and a low of 1 69 ms and bit u2018 0 u2019 may be constituted by a high of.