Abstract: Various embodiments of the present invention relate to a method for managing a companion device, and an electronic device using the same, the electronic device comprising: a communication unit for connecting a communication channel with at least one first external electronic device; and at least one processor functionally connected with the communication unit, wherein the at least one processor requests, from the at least one first external electronic device, information (companion device authentication information) necessary for registering the at least one first external electronic device as a companion device of a second external electronic device, in response to the connection with the at least one first external electronic device, receives and stores the companion device authentication information, registers the electronic device as a companion device of the second external electronic device when the electronic device is connected with the second external electronic device, and transmits the stored compa

Abstract: The present invention relates to an input/output signal synchronization method by a radio frequency unit. The input/output signal synchronization method according to the present invention comprises the steps of: generating a transmitter (Tx) input signal by adding, to a baseband signal, a test signal located at a frequency out of an operation frequency range of the radio frequency unit; collecting the Tx input signal and a Tx output signal obtained by outputting the input signal through a Tx function block; and synchronizing the Tx input signal and the Tx output signals, based on a result obtained by the collecting.

Abstract: A digital broadcast transmitter comprising: a randomizer to receive a data stream of which stuff bytes are inserted into a specified position and to randomize the received data stream; a stuff-byte exchange unit to generate known data having a predefined pattern and to insert the known data into the specified position of the data stream into which the stuff bytes are inserted; an encoder to encode the data stream output from the stuff-byte exchange unit for an error correction; and a modulator and RF converter to modulate the encoded data stream, RF-convert the modulated data stream and transmit the RF-converted data.