Digital broadcasting system and method of processing data

In a transmitting system including a service multiplexer and a transmitter located in a remote site, a method of processing data of the transmitting system, the method comprising:

• comparing an output data rate of the service multiplexer and a transmission data rate of the transmitter;
• when a difference occurs between the two data rates, adjusting a burst period, wherein the burst transmits mobile service data, and encoding the mobile service data;
• and
• referring to the burst period so as to multiplex main service data and the encoded mobile service data in a burst structure.

In a transmitting system including a service multiplexer and a transmitter located in a remote site, a method of processing data of the transmitting system, the method comprising:

• comparing an output data rate of the service multiplexer and a transmission data rate of the transmitter;
• when a difference occurs between the two data rates, inserting or removing transmission null data in or from mobile service data, so as to adjusting the data rate;
• encoding the processed mobile service data, the mobile service data having the transmission null data inserted therein or removed therefrom;
• and
• multiplexing main service data and the encoded mobile service data in a burst structure.

A service multiplexer of a transmitting system, comprising:

• a mobile service multiplexer multiplexing at least one mobile service data type, PSI/PSIP tables for mobile service, and space-filler null data at a predetermined first data rate and outputting the multiplexed data;
• a null packet generator generating space-filler null data, so as to match an output data rate of the mobile service data multiplexer at the first data rate, and outputting the generated space-filler null data to the mobile service multiplexer;
• and
• a transport packet multiplexer multiplexing at least one main service data type and PSI/PSIP tables for main service at a predetermined second data rate, and multiplexing the data outputted from the mobile service multiplexer at a predetermined third data rate, thereby outputting the multiplexed data to a transmitter located at a remote site.

A transmitter of a transmitting system, comprising:

• a demultiplexer receiving data transmitted from a service multiplexer at a predetermined data rate, thereby identifying mobile service data, main service data, and space-filler null data;
• a buffer temporarily storing the mobile service identified by the demultiplexer and outputting the temporarily stored data;
• a pre-processor encoding the data outputted from the buffer;
• a buffer controller monitoring input and output data rates of the buffer, thereby adjusting transmission parameters associated with a burst for transmitting mobile service data, when a difference between the two data rates occurs;
• and
• a packet multiplexer referring to the transmission parameters, thereby multiplexing the mobile service data packet and a main service data packet including main service data in a burst structure.