Digital broadcasting system and data processing method

Abstract

A digital broadcasting system for transmitting/receiving a digital broadcasting signal and a data processing method are disclosed. A program table information has an identifier identifying mobile service data and main service data in a broadcasting signal. The program table information is multiplexed with the mobile service data and main service data. Then, broadcast receiving system can receive and output the mobile service data by parsing the program table information and using the identifier.

What is claimed is: 
     
       1. A method of transmitting a broadcast signal in a transmitter, the method comprising:
 pre-processing first service data including audio data or video data for a mobile service via a preprocessor, wherein pre-processing the first service data comprises:
 block processing the first service data via a block processor, wherein block processing the first service data comprises:
 first converting data bytes of the first service data to data bits via a first converter; 
 encoding the first converted data bits to output symbols via a first encoder; 
 symbol interleaving the output symbols via a symbol interleaver; 
 second converting the symbol interleaved symbols into data bytes of the first service data via a second converter; 
 
 forming data groups via a group formatter, each data group including signaling information, known data sequences that have pre-determined values, and the first service data, wherein the signaling information includes information indicating a number of the data groups to be transmitted during a transmission frame, and 
 forming first service data packets including data in the data groups via a packet formatter; 
 
 multiplexing, via a multiplexer, the first service data packets and second service data packets, the second service data packets including second service data including audio data or video data for a main service; 
 performing, via a second encoder, systematic Reed-Solomon (RS) encoding on the second service data in the multiplexed data packets and non-systematic RS encoding on the first service data in the multiplexed data packets; and 
 transmitting a broadcast signal including the RS encoded first service data and the RS encoded second service data via a transmission unit, 
 wherein a collection of the formed data groups is transmitted during slots in the broadcast signal, 
 wherein the slots are basic time periods for multiplexing of the first service data and the second service data, and 
 wherein the signaling information includes an identifier of the collection of the formed data groups. 
 
     
     
       2. The method of  claim 1 , wherein:
 a code rate of the encoding of the first converted data bits is G/H; and 
 G and H are integers. 
 
     
     
       3. The method of  claim 2 , wherein the signaling information further includes information indicating the code rate. 
     
     
       4. The method of  claim 1 , wherein the pre-processing further comprises first randomizing the first service data via a first randomizer, the method further comprising:
 second randomizing the second service data in the second service data packets and only a portion of the first service data packets via a second randomizer. 
 
     
     
       5. An apparatus for transmitting a broadcast signal, the apparatus comprising:
 a pre-processor configured to pre-process first service data including audio data or video data for a mobile service, wherein the pre-processor comprises:
 a block processor configured to block process the first service data, wherein the block processor comprises:
 a first converter configured to first convert data bytes of the first service data to data bits; 
 a first encoder configured to encode the first converted data bits to output symbols; 
 a symbol interleaver configured to symbol interleave the output symbols; 
 a second converter configured to second convert the symbol interleaved symbols into data bytes of the first service data; 
 
 a group formatter configured to form data groups, each data group including signaling information, known data sequences that have pre-determined values, and the first service data, wherein the signaling information includes information indicating a number of the data groups to be transmitted during a transmission frame, and 
 a packet formatter configured to form first service data packets including data in the data groups; 
 
 a multiplexer configured to multiplex the first service data packets and second service data packets, the second service data packets including second service data including audio data or video data for a main service; 
 a second encoder configured to perform systematic Reed-Solomon (RS) encoding on the second service data in the multiplexed data packets and non-systematic RS encoding on the first service data in the multiplexed data packets; and 
 a transmission unit configured to transmit a broadcast signal including the RS encoded first service data and the RS encoded second service data, 
 wherein a collection of the formed data groups is transmitted during slots in the broadcast signal, 
 wherein the slots are basic time periods for multiplexing of the first service data and the second service data, and 
 wherein the signaling information includes an identifier of the collection of the formed data groups. 
 
     
     
       6. The apparatus of  claim 5 , wherein:
 a code rate of the first encoder is G/H; and 
 G and H are integers. 
 
     
     
       7. The apparatus of  claim 6 , wherein the signaling information further includes information indicating the code rate. 
     
     
       8. The apparatus of  claim 5 , wherein the pre-processor further comprises a first randomizer configured to first randomize the first service data, the apparatus further comprising:
 a second randomizer configured to second randomize the second service data in the second service data packets and only a portion of the first service data packets. 
 
     
     
       9. A method of transmitting broadcast data in a transmitter, the method comprising:
 identifying null data packets in an input stream including the null data packets that contain null data and broadcast service data packets that contain at least broadcast service data for a broadcast service or first signaling data for signaling the broadcast service;   deleting the identified null data packets in the input stream, wherein the first signaling data include information for indicating a type of the broadcast service and information for indicating whether the broadcast service is hidden;   encoding data in the broadcast service data packets to add parity data;   encoding second signaling data including transmission parameters at a code rate, wherein the transmission parameters include information to identify a number of the parity data;   block interleaving the encoded second signaling data;   convolutional interleaving the data to which the parity data are added; and   transmitting a broadcast signal including the convolutional interleaved data and the block-interleaved second signaling data.   
     
     
       10. The method of claim 9, wherein the first signaling data further include major channel information and minor channel information of the broadcast service. 
     
     
       11. A transmitter for transmitting broadcast data, the transmitter comprising:
 a demux to identify null data packets in an input stream including the null data packets that contain null data and broadcast service data packets that contain at least broadcast service data for a broadcast service or first signaling data for signaling the broadcast service, and delete the identified null data packets in the input stream, wherein the first signaling data include information for indicating a type of the broadcast service and information for indicating whether the broadcast service is hidden;   a first encoder to encode data in the broadcast service data packets to add parity data;   a second encoder to encode second signaling data including transmission parameters at a code rate, wherein the transmission parameters include information to identify a number of the parity data;   a first interleaver to block interleave the encoded second signaling data;   a second interleaver to convolutional interleave the data to which to parity data are added; and   a transmitting unit to transmit a broadcast signal including the convolutional interleaved data and the block-interleaved second signaling data.   
     
     
       12. The transmitter of claim 11, wherein the first signaling data further include major channel information and minor channel information of the broadcast service.