Patent ID: 7933299

Claim:
A device for controlling switchover of a broadcasting channel in a digital multimedia broadcasting receiver, the device comprising: a first demultiplexing unit including a buffer for firstly buffering transport stream packets, and a Program Association Table (PAT) searcher, a Program Map Table (PMT) and an intra frame searcher for searching the firstly buffered transport stream packets sequentially for a Program Association Table (PAT), a Program Map Table (PMT), and an intra frame, respectively, the first demultiplexing unit further for obtaining program information on the broadcasting channel to be switched over; and a second demultiplexing unit for secondly buffering the transport stream packets, wherein the second demultiplexing unit searches from the obtained program information, the secondly buffered transport stream packets for an audio or video transport stream packet of the corresponding broadcasting channel, and performs audio or video demultiplexing for the searched audio or video transport stream packet without searching for the respective PAT, PMT, and intra frame, when the first demultiplexing unit succeeds in searching for the PAT, the PMT, and the intra frame on the broadcasting channel to be switched over, and wherein when the first demultiplexing unit fails to search the PAT, the PMT, and the intra frame, the first demultiplexing unit searches for the PAT, the PMT and the intra frame by reusing the firstly buffered transport stream packets without discarding the firstly buffered transport stream packets, wherein the device further comprises an audio demultiplexer for searching the firstly buffered transport stream packets for the audio transport stream packet of the corresponding broadcasting channel, and performing the audio demultiplexing for the searched audio transport stream packet, and a video demultiplexer for searching the firstly buffered transport stream packets for the video transport stream packet of the corresponding broadcasting channel, and performing the video demultiplexing for the searched video transport stream packet, and wherein the PAT searcher, the PMT searcher, and the intra frame searcher search the PAT, the PMT, and the intra frame, respectively, by reusing the firstly buffered transport stream packets.