Patent ID: 7924762

Claim:
A retransmission apparatus using an (Internet Protocol) IP multicasting method for a Digital Multimedia Broadcasting (DMB) service, comprising: a plurality (n) of radio frequency (RF) receivers, each for receiving a DMB RF signal of DMB broadcast data of an associated channel; a plurality (n) of DMB decoders, each for outputting a transport stream (TS) by decoding the DMB RF signal of an associated channel received from a relevant RF receiver; a plurality (n) of slicers, each for processing the TS input from an associated DMB decoder; a plurality (n) of network interfacers, each for IP packetizing the TS sliced by a corresponding slicer; a network switch for receiving the IP packets from the plurality (n) of network interfacers, multiplexing the received IP packets, and, transferring the multiplexed IP packets to a multicasting processing unit; and the multicasting processing unit for receiving the IP packets from the network switch, creating a single piece of multicasting data by assigning multicasting addresses to the received IP packets, and outputting the created multicasting data to the network switch, wherein multicasting data includes a source address set to identify channel information selected by each of the plurality (n) of RF receivers, wherein each of the plurality (n) of slicers comprises: a TS demultiplexer for demultiplexing the TS from a corresponding DMB decoder into a video signal, an audio signal, and a data signal; a re-slicer for parsing only the video signal from among the video signal, audio signal and data signal from among the TS, and for encoding only the parsed video signal on a basis of a predetermined slice of a known size; and a TS multiplexer for multiplexing the parsed and encoded video signal received from the re-slicer with the audio signal and data signal received from the TS demultiplexer; wherein the DMB broadcast data transmitted by the DMB service and received by the plurality of RF receivers is retransmitted as multicasted channel data of DMB-IP multimedia data.