Patent ID: 8396113
Filing Date: 2013-03-12
Classification: H04N

Abstract:
1. A data receiving device for shortening a channel switching time in a digital multimedia broadcasting (DMB) system, the device comprising: a plurality of code division multiplexing (CDM) channels, each for: receiving a broadcast signal from a DMB satellite, demodulating the broadcast signal, and generating a moving picture experts group2-transport stream (MPEG2-TS) packet; a plurality of group-of-picture (GOP) buffers, each associated with one of the CDM channels, and each for: receiving the MPEG2-TS packet from the associated CDM channel, checking whether the received MPEG2-TS packet includes a key frame, and, if so, initializing the GOP buffer to a size value of zero, and storing the received MPEG2-TS packet as a GOP unit until a next key frame is received, and wherein when the next key frame is received in the course of storing the MPEG2-TS packet in the GOP buffer, repeating the initializing and storing to again initialize the GOP buffer to a size value of zero and store the received MPEG2-TS packet until a next key frame is again received to the initialized GOP buffer; a channel switch for switching a channel of a DMB service to one of the GOP buffers corresponding to the switched DMB service channel in response to an input signal from a user; an A/V (audio/video) reproducing buffer for buffering a predetermined amount of A/V data to reproduce the A/V data of the one GOP buffer switched by the channel switch; and an A/V decoder for receiving the A/V data from the A/V reproducing buffer, and decoding the received A/V data.