Patent ID: 8144790

Claim:
A broadcast receiver comprising: a tuner for receiving a broadcast signal including a transmission frame, wherein a parade of data groups are received during slots within the transmission frame, the slots being basic time periods for multiplexing mobile data and main data, wherein each data group of multiple parades is assigned to a single transmission frame, wherein a plurality of consecutive data groups in the parade are assigned to be spaced apart from one another within the transmission frame, and wherein each of the data groups includes the mobile data, a transmission parameter and known data sequences; a Reed-Solomon (RS) frame decoder for performing Cyclic Redundancy Check (CRC)-decoding and RS-decoding on the mobile data in order to correct errors in the mobile data; a demodulator for demodulating the broadcast signal, wherein each of the data groups is divided into a plurality of regions, wherein M known data sequences are inserted in the plurality of regions within each of the data groups, and wherein the transmission parameter of each of the data groups is inserted between a first known data sequence and a second known data sequence of the M known data sequences; a transmission parameter detector for detecting the transmission parameter of each of the data groups; a block decoder for symbol-decoding the mobile data included in the received broadcast signal in block units based upon the detected transmission parameter of each of the data groups; a decoding unit for extracting at least safety information or security information from the error-corrected mobile data in order to decode the extracted at least safety information or security information with at least an audio decoder, a video decoder or a data decoder; and an output unit for outputting the at least safety information or security information decoded by the decoder in a form of at least text, a voice message or an image.