KR19990075945A - Service Data Processing Method of Satellite Broadcasting System - Google Patents

Abstract

According to the present invention, the satellite broadcasting system transmits PAT / PMT data including PID information of all broadcast channels by RLC encoding, thereby preventing delay in decoding time due to the diversification of broadcast channels, The present invention relates to a service data transmission method of a satellite broadcasting system capable of transmitting PAT / PMT information for all broadcast channels through a repeater. To this end, the present invention provides a plurality of service data for all channels of satellite broadcasting by RLC encoding a plurality of service data. Receive and transmit the RLC coded service data through the repeater, and store the RLC coded service data in the first storage area, and then RLD decode and restore the RLC coded service data stored in the first storage area and store it in the second storage area. Select data transmitted from the satellite using service data stored in a second storage area. And extracting, decoding and displaying.

Description

Service Data Processing Method of Satellite Broadcasting System

The present invention relates to a satellite broadcast receiver, and more particularly, to a method of processing service data including various packet information and user interface information in a digital satellite broadcast system.

The satellite broadcasting system receives a digital broadcast signal in the form of a packet on a packet basis, extracts a broadcast signal of a selected channel among broadcast signals received by a transport demultiplexer, and then extracts the extracted broadcast signal into MPEG (Motion Picture). Expert Group) to decode and provide to the display device. In this case, the bit stream provided from the satellite includes various information such as broadcast signals (video data and audio data), event information table (EIT), and time data table (TDT) for each channel.

In addition to the general audio signal and video signal, the digital broadcast signal provided to the digital broadcast receiver includes PAT (weakly referred to as PAT) and PMT (for example, PAT) in a predetermined time (T1) unit as shown in FIGS. 1A and 1B. Program Map Table: hereinafter abbreviated as PMT) Packet information is included and transmitted. Here, PAT is packet information that provides PID (Packet Identifier) information of a transport packet that transmits a table describing a component of a program, and is NIT (Network for all transmitted bitstreams). It consists of Information Table (SDT), Service Description Table (SDT), Time Date Table (TDT) and Receiver Command Massages (RCM), and PID information of PMT. PMT is an elementary stream that contains encoded video, audio, and data. (Also known as ES), which maps the program number to information that defines the program.

The digital broadcast receiver performs the above-described transport demultiplexing process by referring to the PMT and PAT information, and extracts a bitstream of a broadcast signal, that is, a video and an audio signal, of a channel selected by a user, and processes and decodes a predetermined signal. The process is displayed on the screen. In other words, the PAT / PMT is first received when the decoding of the bit stream transmitted from the satellite broadcasting receiver is initially supplied, and the PID information of the audio signal and the video signal is again extracted from the satellite broadcasting receiver. The broadcast signal is selected and displayed.

On the other hand, a general broadcast satellite is equipped with a plurality of repeaters, each repeater is assigned to transmit a predetermined number of channels, in general, the transmitting station (broadcasting station) transmitting the satellite broadcast signal using each repeater mounted on the satellite The PAT / PMT including PID information of all broadcast channels as well as the broadcast signal of each channel is inserted into the satellite broadcast signal and transmitted. However, as the total number of channels of the satellite broadcasting system gradually increases, the size of the PAT / PMT information for all channels increases, thereby receiving the decoding start time, that is, receiving the PAT / PMT information, and receiving the received PAT / PMT information. There is a problem in that the decoding start time is delayed. Accordingly, in order to overcome this problem, each repeater mounted on the satellite uses a method of transmitting only PAT / PMT for broadcast channels assigned to the repeater.

However, in the satellite broadcasting system according to the conventional PAT / PMT transmission method, a channel map for the entire broadcasting channel is received by a satellite broadcasting receiver that receives the satellite broadcasting signal transmitted from the satellite and displays it through a predetermined signal processing process. Another problem arises in that each repeater must be tuned at least once to make up.

Accordingly, the present invention is to solve the above-described problems of the prior art, and in the satellite broadcasting system transmits the PAT / PMT including the information about the entire channel by RLC (Run Length Coding), thereby transmitting the entire broadcast channel through each repeater. An object of the present invention is to provide a service data processing method of a satellite broadcasting system capable of transmitting PAT / PMT.

In order to achieve the above object, the present invention receives a bitstream for a satellite broadcast signal from a satellite equipped with a plurality of repeaters, and extracts various service data inserted in the bitstream to selectively select signals for a plurality of broadcast channels. A method of processing service data of a satellite broadcasting system, the method comprising: a first step of RLC encoding service data for all channels of the satellite broadcasting and transmitting the same through the plurality of repeaters; A second step of receiving the RLC encoded service data transmitted from any one of the plurality of repeaters and storing it in a first storage area; A third step of RLD decoding and reconstructing the RLC encoded service data stored in the first storage area and storing the RLC coded service data in the second storage area; And a fourth step of selectively extracting, decoding, and displaying data transmitted from the satellite by using the service data stored in the second storage area.

1 is a transmission format diagram of a digital broadcast signal including a PAT (Program Association Table) and a PMT (Program Map Table) packet information transmitted in a general satellite broadcasting system.

2 is a block diagram of a satellite broadcasting receiver suitable for applying a service data processing method of a satellite broadcasting system according to an embodiment of the present invention;

3 is a flowchart illustrating a service data processing procedure of a satellite broadcasting system according to an exemplary embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

110: tuner and demodulator 120: microcomputer

130: transport demultiplexer 140: MPEG decoder

150: audio signal processor 160: video signal processor

170: first buffer 175: second buffer

180: RLD processing unit

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, a transmitting station providing a satellite broadcasting service transmits a large amount of PAT / PMT data, that is, PAT / PMT data for all channels, generated by an increase in the total number of broadcast channels, and then transmits the encoded data. PAT / PMT data will be transmitted simultaneously through all satellite repeaters. Therefore, since a satellite broadcast receiver receiving a satellite broadcast signal can receive PAT / PMT data for all channels regardless of which initial broadcast channel is selected, it is possible to construct a channel map for all channels.

2 is a block diagram of a satellite broadcasting receiver suitable for applying a service data processing method of a satellite broadcasting system according to an exemplary embodiment of the present invention, and includes a tuner and a demodulator 110, a microcomputer 120, and a transport demultiplexer. 130, an MPEG decoder 140, an audio signal processor 150, a video signal processor 160, first and second buffers 170 and 175, and an RLD processor 180.

The tuner and demodulator 110 selects a broadcast channel selected by a user from a broadcast signal received through a broadcast signal receiver (i.e., a satellite reception antenna), not shown, based on a tuning control signal provided from a microcomputer 120, which will be described later. The tuned broadcast channel signal is restored to a transport stream through a process of converting to an intermediate frequency, demodulation, and error correction. The microcomputer 120 is a microprocessor that controls the overall operation of the satellite broadcasting receiver (not shown). When the user inputs a specific command by operating a key input means (not shown), the microcomputer 120 may provide a function corresponding to the input key signal. It generates various control signals for performing.

The transport demultiplexer 130 extracts the RLC-coded PAT / PMT data including the PID data from the signals transmitted from the tuner and the demodulator 110 and provides the extracted microcomputer 120 to the microcomputer 120. The demultiplexing process is performed such that only video and audio signals corresponding to a broadcast signal having a PID set by the PID are transmitted, and the MPEG decoder 140 compresses and encodes a bit stream output from the transport demultiplexer 130; A video signal, for example, a video signal, which is coded in consideration of the spatial and spatial correlation, is restored to the original signal before encoding by using a decoding method such as variable length decoding, inverse DCT, inverse quantization, and motion compensation. .

In addition, the audio signal processor 150 converts the digital audio signal decoded and output from the MPEG decoder 140 into an analog audio signal and outputs it through a speaker (not shown). The video signal processor 160 also includes an MPEG decoder 140. ) Is converted into an NTSC or PAL analog video signal through a predetermined signal processing process and then displayed on a monitor (not shown).

On the other hand, the microcomputer 120 stores various service information including PAT / PMT data extracted from the transport demultiplexer 130 in the first buffer 170, and this is again referred to as Run Length Decoding (hereinafter referred to as RLD). It is provided to the processor 180. At this time, the RLD processor 180 RLD decodes the RLC-coded PAT / PMT data provided from the microcomputer 120 and stores the RLD coded PAT / PMT data in the second buffer 175 through the microcomputer 120. In other words, the transmitting side transmitting the satellite broadcasting signal transmits the PAT / PMT data for all channels by RLC encoding. In this case, each repeater mounted on the satellite by separately inserting information bits according to whether the PAT / PMT data is RLC encoded Through the transmission to a plurality of satellite broadcast receivers.

The satellite broadcasting receiver receiving the RLC code extracts the RLC-coded PAT / PMT data from the bit stream transmitted from the satellite repeater based on the information bits according to the RLC encoding, and then restores the PAT / PMT data by RLD decoding. Based on the recovered PAT / PMT data, video and audio data for a plurality of channels can be selectively extracted.

3 is a flowchart illustrating a service data processing process of a satellite broadcasting system according to a preferred embodiment of the present invention. A series of processes described above with reference to the accompanying drawings will be described in detail as follows.

First, the transmitting side transmitting the satellite broadcast signal configures PAT / PMT data for all broadcast channels (step 301), and then reduces the data amount by RLC encoding the PAT / PMT data (step 303). The encoded PAT / PMT data is transmitted through each loaded repeater (step 305).

Meanwhile, in the satellite broadcast receiver configured as shown in FIG. 2, when a bitstream transmitted from an arbitrary repeater mounted on the satellite is received (step 307), the microcomputer 120 outputs a bit output from the transport demultiplexer 130. The PAT / PMT data is extracted from the RLC-coded PAT / PMT data based on the information bits according to the RLC encoding in the stream, and stored in the first buffer 170 (step 309). At this time, since each repeater of the satellite transmitting the satellite broadcast signal transmits all the PAT / PMT data of the same contents, that is, the PAT / PMT data for all satellite broadcasting channels, the satellite receiver receiving the satellite broadcast receiver receives all It is possible to extract PAT / PMT data for the entire satellite broadcast channel by receiving only a bitstream transmitted from an arbitrary repeater, that is, one repeater, without the need for tuning the repeater.

Subsequently, when the extraction process of the PAT / PMT data for the entire channel provided from the satellite is completed through the aforementioned step 309 (step 311), the microcomputer 120 stores the RLC coded data stored in the first buffer 170. The data is transmitted to the RLD processing unit 180 (step 313). The RLD processor 180 RLD decodes the RLC-coded PAT / PMT data provided from the microcomputer 120 to provide the microcomputer 120 again (step 315), and the microcomputer 120 decodes the PAT / PMT. Data is stored in the second buffer 175 (step 317).

After processing and storing PAT / PMT data including PID information of all satellite broadcasting channels through the above-described process, the microcomputer 120 reads the PAT / PMT information stored in the second buffer 175. (Step 319) Tuning the broadcast signal for any broadcast channel selected by the user, that is, selectively extracting and decoding video data and audio data for the channel, and performing data for various additional information at the request of the user. The extracted information may be displayed accordingly (step 321).

In satellite broadcasting system, PAT / PMT data including PID information of all channels is RLC-coded to reduce the total data amount of PAT / PMT and transmitted, so that the PAT / PMT is transmitted to all broadcasting channels through each repeater mounted in the satellite. There is an effect that can transmit data, and accordingly, the satellite broadcast receiver that receives the satellite broadcast signal can receive PAT / PMT data for the entire broadcast channel by tuning only one repeater of a plurality of repeaters mounted on the satellite. Regardless of the increase in the total broadcast channel, there is an effect that the time taken to receive and process PAT / PMT data can be reduced.

Claims (1)

A service of a satellite broadcasting system that receives a bitstream of a satellite broadcasting signal from satellites equipped with a plurality of repeaters, and selectively tunes and displays signals for a plurality of broadcasting channels by extracting various service data inserted in the bitstream. In the data processing method, A first step of RLC encoding service data for all channels of the satellite broadcasting and transmitting the same through the plurality of repeaters; A second step of receiving the RLC encoded service data transmitted from any one of the plurality of repeaters and storing it in a first storage area; A third step of RLD decoding and reconstructing the RLC encoded service data stored in the first storage area and storing the RLC coded service data in the second storage area; And selectively extracting, decoding, and displaying data transmitted from the satellite by using the service data stored in the second storage area.