Abstract: A null packet insertion apparatus including a null packet remover for removing an irregularly inserted null packet from an externally received video/audio transport stream; a null packet bit rate calculator for calculating a bit rate of the removed null packet; a GUI for determining the transmission period of a periodic null packet to be newly inserted, based on the calculated bit rate, by an external user; a periodic null packet generator; a multiplexer for regularly inserting the periodic null packet preferentially and inserting the video/audio transport stream with the irregular null packet removed, and performing multiplexing; a non-periodic null packet generator; and a PCR corrector.

Abstract: Disclosed is a contents conversion apparatus which includes; a demultiplexer for demultiplexing an externally input broadcasting stream of a first broadcasting standard and dividing it into an audio stream, a video stream, and a data stream; a converter for converting a coding format of the audio stream to a coding format of a desired second broadcasting standard, and converting a broadcasting service format of the data stream to a service format of the second broadcasting standard; a protocol server for providing a protocol stream of the second broadcasting standard; and a multiplexer for multiplexing the audio stream and the data stream output from the converter, the video stream and the protocol stream to generate one transfer stream.

Abstract: The null packet insertion apparatus includes: a null packet remover for removing an irregularly inserted null packet from an externally received video/audio transport stream; a null packet bit rate calculator for calculating a bit rate of the removed null packet; a GUI for determining the transmission period of a periodic null packet to be newly inserted, based on the calculated bit rate, by an external user; a periodic null packet generator for generating a periodic null packet according to the determined transmission period; a multiplexer for regularly inserting the periodic null packet preferentially and inserting the video/audio transport stream with the irregular null packet removed, and performing multiplexing; a non-periodic null packet generator for generating a non-periodic null packet and inserting the generated non-periodic null packet, when an output rate of the multiplexed transport stream is not equal to an input rate of the externally received video/audio transport stream; and a PCR corrector f

Abstract: Disclosed is a digital broadcast protocol conversion system including: a PSIP/PSI extractor for demultiplexing a transport stream of an ATSC broadcast standard to extract PSIP/PSI data; an SI/PSI extractor for demultiplexing a transport stream of a DVB broadcast standard to extract SI/PSI data; a protocol converter for converting the PSIP/PSI data to SI′/PSI′ data corresponding to a broadcast protocol of the DVB broadcast standard or converting the SI/PSI data to PSIP′/PSI′ data corresponding to a broadcast protocol of the ATSC broadcast standard; and a multiplexer for multiplexing the SI′/PSI′ data and the transport stream having the PSIP/PSI data extracted therefrom, or multiplexing the PSIP′/PSI′ data and the transport stream having the PSIP/PSI data extracted therefrom, thereby converting the broadcast protocol between different broadcast standards.