Digital broadcasting system and data processing method
A digital broadcasting system and a method of processing data are disclosed. A receiving system of the digital broadcasting system may include a signal receiving unit, a demodulating unit, a demultiplexer, and an audio/video decoder. The signal receiving unit receives a broadcast signal including main service data and an RS frame including a plurality of MPH service data packets. The demodulating unit demodulates data of the RS frame. The demultiplexer identifies an MPH service data packet including an IP datagram of mobile service data with reference to an MPH header of each MPH service data packet in the RS frame, and when a stuffing data is inserted in the identified payload of MPH service data packet, removes the stuffing data from the payload and separates an audio and video data from IP datagram of the mobile service data of the payload, and outputs the separated audio and video data.
1. A method of processing broadcast data in a transmitting system, the method comprising:
encoding data in data packets at a first code rate, wherein the data packets include broadcast service data and signaling data for a broadcast service, wherein the broadcast service data include at least video data or audio data, wherein each data packet includes a header and a payload, wherein the header includes stuffing indication information indicating whether stuffing data are included in the data packet, and wherein, when a length of the stuffing data is equal to or more than 3-byte, a length of the stuffing data is indicated by using a length indication field in the data packet;
block interleaving the encoded data;
convolutional interleaving the block-interleaved data;
first encoding transmission parameters in order to add parity data to the transmission parameters, wherein the transmission parameters include encoding information for identifying the first code rate used for encoding the data in the data packets;
second encoding the first-encoded transmission parameters at a second code rate;
modulating the convolutional interleaved data and the second-encoded transmission parameters; and
transmitting a transmission frame including the modulated data and the modulated transmission parameters,
wherein the transmission frame comprises multiple sub-frames concatenated in time within the transmission frame,
wherein the transmission parameters further include information related to at least one of the multiple sub-frames,
wherein the signaling data include first signaling information and second signaling information,
wherein the first signaling information includes channel information of the broadcast service, type information of the broadcast service, and status information for indicating whether the broadcast service is hidden, and
wherein the second signaling information includes protocol version information and at least video codec information for the video data or audio codec information for the audio data.
2. The method of claim 1 , wherein information for acquiring the first signaling information is predefined.
3. The method of claim 1 , wherein, when the length of the stuffing data is either 1-byte or 2-byte, the length of the stuffing data is identified based on the stuffing data.
4. The method of claim 1 , wherein the first signaling information and the second signaling information further include service identification information for identifying the broadcast service, respectively.
5. A transmitting system for processing broadcast data, the transmitting system comprising:
a first encoder to encode data in data packets at a first code rate, wherein the data packets include broadcast service data and signaling data for a broadcast service, wherein the broadcast service data include at least video data or audio data, wherein each data packet includes a header and a payload, wherein the header includes stuffing indication information indicating whether stuffing data are included in the data packet, and wherein, when a length of the stuffing data is equal to or more than 3-byte, a length of the stuffing data is indicated by using a length indication field in the data packet;
a first interleaver to block interleave the encoded data;
a second interleaver to convolutional interleave the block-interleaved data;
a first signaling encoder to first encode transmission parameters in order to add parity data to the transmission parameters, wherein the transmission parameters include encoding information for identifying the first code rate used for encoding the data in the data packets;
a second signaling encoder to second encode the first-encoded transmission parameters at a second code rate;
a modulator to modulate the convolutional interleaved data and the second-encoded transmission parameters; and
a transmitter to transmit to a transmission frame including the modulated data and the modulated transmission parameters,
wherein the transmission frame comprises multiple sub-frames concatenated in time within the transmission frame,
wherein the transmission parameters further include information related to at least one of the multiple sub-frames,
wherein the signaling data include first signaling information and second signaling information,
wherein the first signaling information includes channel information of the broadcast service, type information of the broadcast service, and status information for indicating whether the broadcast service is hidden, and
wherein the second signaling information includes protocol version information and at least video codec information for the video data or audio codec information for the audio data.
6. The transmitting system of claim 5 , wherein information for acquiring the first signaling information is predefined.
7. The transmitting system of claim 5 , wherein, when the length of the stuffing data is either 1-byte or 2-byte, the length of the stuffing data is identified based on the stuffing data.
8. The transmitting system of claim 5 , wherein the first signaling information and the second signaling information further include service identification information for identifying the broadcast service, respectively.