KR100647358B1 - The system and method for receiving a conditional access system channel information in a satellite digital multimedia broadcasting through a communication network - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and method for receiving channel access information (CAD) in satellite digital multimedia broadcasting (DMB) through a communication network. By transmitting the broadcast channel information through the communication network in the conventional satellite DMB broadcasting terminal receives the AV (Audio or Video) channel access control information through the CAS channel, through this to improve the method of accessing the AV channel.

A system and method for receiving channel access control (CAS) channel information in satellite digital multimedia broadcasting (DMB) through a communication network of the present invention is to provide AV channel access control information to a broadcasting module and mobile communication. A satellite DMB broadcasting system transmitting to the system; A mobile communication system receiving AV channel access control information from the satellite DMB broadcasting system and transmitting the received AV channel access control information to a communication module; A communication module for receiving AV channel access control information from the mobile communication system and manually or automatically connecting a service to a broadcasting module; And a broadcasting module for receiving AV channel access control information from the satellite DMB broadcasting system and being connected manually or automatically from the communication module.

Satellite DMB broadcasting system, mobile communication system, communication module, broadcasting module, convergence terminal

Description

The system and method for receiving a conditional access system channel information in a satellite digital multimedia broadcasting through a communication network}             

1 illustrates a conventional digital broadcast receiver.

2 illustrates a system and method for a service in which broadcast and communication are linked according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and method for receiving channel access information (CAD) in satellite digital multimedia broadcasting (DMB) through a communication network. By transmitting the broadcast channel information through the communication network in the conventional satellite DMB broadcasting terminal receives the AV (Audio or Video) channel access control information through the CAS channel, through this to improve the method of accessing the AV channel.

Recently, due to the rapid development of information media, information (data) has been shifted from the analog transmission to the digital transmission.

At this time, in response to a request to transmit more information within the same time, data is compressed and transmitted according to a data compression rule called "MPGE".

Moving Picture Experts Group (MPEG) is an international standard for digital video encoding (compression), sound coding and multiplex / separation methods for common use in communications, broadcasting, storage media, and computers. International Organization for Standardization: Standardized encoding method by International Organization for Standardization.

Such MPEG can transmit the audio visual, that is, the audio signal, the video, and the still image, by compressing it with a high compression rate to obtain multi-channel and high-quality transmission effect in broadcasting, and to reduce the occupancy and low cost in storage media. It is possible to obtain the effect of recording the multimedia information in the storage media, and the advantage of being able to perform multimedia communication at a low price in the communication media, it has become a core technology of the recent multimedia era.

On the other hand, general televisions are standardized to process analog broadcast signals. As satellite broadcasting and other digital broadcasting methods are popularized, they are compressed and transmitted according to MPEG regulations so that users can watch digital broadcasting signals through analog televisions. In order to process the digital broadcast signal and convert it into an analog broadcast signal, a separate conversion device called a digital set top box is provided, that is, a digital broadcast receiver.

The digital broadcast receiver is a program provider or a service provider, that is, a broadcast capable of signal processing to a television by converting a digital video signal such as each broadcasting station or a cable broadcasting station such as cable television and satellite broadcasting into an analog video signal. Background Art As a device for converting into a digital display system, it is rapidly spreading in recent years due to the desire of consumers to watch digital broadcasting signals.

Therefore, each broadcasting station or a cable broadcasting station converts and provides a program analog signal of a service into a digital signal.

This converted data is compressed by a predetermined compression method to convey a lot of information, and then transmitted to the subscriber side through the communication network.

The subscriber side is provided with the above digital broadcasting receiver (digital set-top box) to receive the transmitted digital data, convert it to an analog signal, and display it on a monitor.

As described above, there is a receiving apparatus as shown in FIG. 1 as an apparatus for processing a digital signal compressed and transmitted by each broadcasting station or a cable broadcasting station and displaying the same on an monitor.

1 illustrates a conventional digital broadcast receiver. The digital broadcast receiver tunes the compressed hybrid carrier signal transmitted from each broadcasting station or digital cable broadcasting station through the input terminal 10 to the frequency of the corresponding channel, and adjusts the amplitude of the tuned carrier signal. A satellite broadcast tuner 11 that changes in proportion to the magnitude of the phase shift modulated signal, and a diplexer 12 that removes mutual interference between the video signal and the audio signal among the carrier waves obtained by tuning through the satellite broadcast tuner 11; A filter unit 13 for filtering the carrier signal obtained from the diplexer 12 to extract only the digital signal band, an analog / digital converter 14 for converting the extracted analog signal into a digital signal and outputting the digital signal; A demodulator 15 for restoring the digital data obtained from the analog / digital converter 14 to the original data, and generated by interference between adjacent channels. Automatic error correction unit 16 for correcting the carrier data format demodulated by the demodulator 15 and corrected based on the surplus information and outputting them in packet units, and the video data and audio inputted after the error is corrected. An MPEG processing unit for storing data in the memory unit 19 by converting it into an original composite video signal (CPSV) and an audio signal (ADS), and outputting the same to the video output terminal 111 and the audio output terminal 112, respectively. (17) and a high frequency modulator 18 modulating the digital composite video signal (CPSV) and the audio signal (ADS) restored by the MPEG processor 17 into a high frequency signal and providing the same to the television receiver through the output terminal 20. It consists of.

In the conventional digital broadcasting receiver configured as described above, when a digital video signal and an audio signal for a program are compressed and mixed in each broadcasting station or digital cable broadcasting station and input as a carrier signal through the input terminal 10, the satellite broadcasting tuner 11 is inputted. The compressed hybrid carrier signal received and input through the terminal 10 is tuned to the frequency of the corresponding channel, and the amplitude of the tuned carrier signal is changed in proportion to the magnitude of the phase shift signal.

Then, the amplitude-changed carrier signal is provided to the diplexer 12 through the satellite broadcast tuner 11.

The diplexer 12 removes the mutual interference between the compressed video signal and the audio signal among the carrier signals obtained by tuning through the satellite broadcast tuner 11 and provides the filter unit 13 to the filter unit 13.

Meanwhile, the filter unit 13 filters the carrier signal input from the diplexer 12 to detect only the digital signal band, that is, the 450 MHz to 700 MHz band.

The carrier signal of the analog component detected through the filter unit 13 is provided to the demodulator 15 after being converted into a digital signal through the analog / digital converter 14.

The demodulator 15 restores the digital data input from the analog / digital converter 14 to the original data.

The carrier data reconstructed by the demodulator 15 is corrected by an error generated by interference between adjacent channels in the automatic error correction unit 16, and is provided to the MPEG processor 17 as original video and audio packet data.

Therefore, the MPEG processor 17 stores the video data and the audio data input from the automatic error correcting unit 16 in the memory unit 18, and also stores the MPEG as the original composite video signal (CPSV) and the audio signal (ADS). It is processed and output through each video output terminal 21 and audio output terminal 22, and is also provided to the high frequency modulator 18.

The high frequency modulator 18 modulates the composite video signal CPSV and the audio signal ADS processed by the MPEG processor 17 into a high frequency signal and provides the same to the tele vision receiver through the output terminal 20. Will be able to watch digital broadcasts through the Color Awards.

Then, the composite video signal and the audio signal outputted to the video output terminal 21 and the audio output terminal 22 are provided to a digital video disc player or digital VR to be recorded on the magnetic recording medium.

However, the conventional digital broadcasting receiver and its analog receiving method as described above efficiently access access control information for a broadcast program repeatedly transmitted through a conditional access system (CAS) information reception of a broadcast program through a communication network. Can not receive and store, can not save the processing power (processing power) of the terminal, can not reduce the delay in the broadcast program reception.

Accordingly, an object of the present invention is to improve a method of receiving broadcast information by utilizing a communication function in a terminal in which broadcasting and communication are converged.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and method for receiving channel access information (CAD) in satellite digital multimedia broadcasting (DMB) through a communication network. In the terminal, by transmitting broadcast channel information through a communication network, a conventional satellite DMB broadcasting terminal receives AV (Audio or Video) channel access control information through a CAS channel, thereby improving the method of accessing an AV channel.

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

2 illustrates a system and method for a service in which broadcast and communication are linked according to the present invention. The satellite DMB broadcasting system 100 transmits AV channel access control information to the broadcasting module 400 through the CAS channel and to the mobile communication system 200 through the communication channel. The mobile communication system 200 receives the AV channel access control information from the satellite DMB broadcasting system 100 and transmits it to the communication module 300. The communication module 300 receives the AV channel access control information from the mobile communication system 200, connects the service to the broadcasting module 400 manually or automatically, and receives and stores CAS channel information. 300a). The broadcasting module 400 receives the AV channel access control information from the satellite DMB broadcasting system 100 and is connected manually or automatically from the communication module 300. Accordingly, an improved method in which broadcasting and communication are converged from the existing broadcasting terminal method that receives the broadcasting channel access control information through only the CAS channel may be used.

In addition, the flow of broadcast program reception using broadcast channel access control information received through a communication network according to the present invention is as follows.

First, the satellite DMB broadcasting system 100 transmits the AV channel access control information to the mobile communication system 200.

Next, the mobile communication system 200 receives the AV channel access control information from the satellite DMB broadcasting system 100 and transmits it to the communication module 300 through a communication channel.

Next, the communication module 300 receives the AV channel access control information and stores it in the storage module 300a.

Next, the broadcast module 400 receives the AV channel access control information stored in the communication module 300 to the broadcast module 400.

Finally, the satellite DMB broadcasting system 100 transmits the AV channel access control information to the broadcasting module 400 through the CAS channel and receives the broadcasting module 400.

Here, there are four ways in which the communication module 300 of the fusion terminal receives broadcast channel information from the mobile communication system 200 as follows.

First, there is a method of downloading access control information of a broadcast program channel from a communication network for several hours or days at the moment when the power of the communication module 300 is turned on.

Second, there is a method in which the communication module 300, which is turned on, downloads broadcast channel information once a day.

Third, there is a method of pushing broadcast channel information in a network of the mobile communication system 200.

Fourth, there is a method of pulling access control information of a broadcast program channel when a consumer needs it.

Fifth, there is a method using a mixture of the four methods.

In the fusion terminal of the present invention, a function of broadcasting and communication is implemented in one terminal and receives and stores broadcast channel access control information through the communication module 300, and uses the stored information for receiving a broadcast program. The fusion terminal can efficiently access the broadcast AV channel by receiving and storing broadcast channel access control information through a communication network, rather than receiving broadcast channel access control information through the broadcast CAS channel without storing the information. This is because the fluctuation of the broadcast AV channel access control information transmitted through the broadcast CAS channel is not large, and the same information is repeatedly transmitted and received and stored at a time through the communication network so that the existing broadcast terminal always broadcasts the CAS channel. By reducing the hassle of receiving and decoding information, the terminal can improve the terminal, thereby reducing the time required for the user to access the broadcast program and saving the battery.

Conventional satellite DMB systems include pilot channels, CAS channels, EPG (Electronic Program Guide) channels, and AV channels. In other words, the physical information of the AV channel is mainly transmitted through the pilot channel, the access control information of the subscriber is transmitted through the CAS channel, and the program content information of the AV channel is transmitted through the EPG channel. do. The program content itself is transmitted through the AV channel. Accordingly, the present invention has the following advantages by improving the problem that the existing broadcast terminal must always receive the AV channel access control information of the CAS channel in order to watch or listen to the AV channel.

First, it reduces the amount of computation that must always receive and decode a CAS channel.

Second, the access control information of the broadcasting AV channel through the communication network without the hassle that a consumer who purchases a satellite DMB terminal with a built-in communication terminal needs to visit the branch office in order to register the access control information for the AV channel with the terminal. By receiving the can provide the convenience of broadcasting service subscription / termination.

Third, additional information such as PAT (Program Association Table), CAT (Conditional Access Table), NIT (Network Information Table), BIT (Broadcaster Information Table), and EMM (Entitlement Management Message) transmitted through the CAS channel, which are broadcast channels Differentiate from the terminal in the display of the program related to access control by allowing the terminal to perform management functions related to access control for the program for several days by receiving and storing through the communication channel without receiving it repeatedly. The display becomes possible, and through this, a differentiated advertisement or promotion function can be performed for each subscriber. That is, it is possible to provide a service using this information by storing information about a future program as well as a currently received program in advance.

Through this, the subscriber station does not need continuous reception due to the way that the broadcast terminal receives the access control information on the CAS channel received through the broadcasting network, and saves and utilizes the access control information received intermittently through the communication network. Has In addition, in the broadcasting network, the information of multiple anonymous users in the access control information of the AV channel should be repeatedly transmitted to all users, but the method of transmitting the AV channel information through the communication network is different from that in the broadcasting network. Each has the efficiency of delivering different information only to the corresponding user. That is, in the broadcasting network, the access control information for all users must be transmitted, but in the communication network, only the access control information for the user needs to be delivered.

As described above, a system and method for receiving channel information in a conditional access system (DAS) in satellite digital multimedia broadcasting (DMB) through a communication network according to the present invention are described in detail. It is possible to efficiently receive and store access control information about broadcasting programs repeatedly transmitted through CAS information reception, and by using stored access control information, there is no need to repeatedly receive CAS channels, thus processing power of the terminal ), And the processing time of the terminal is reduced to reduce the delay in receiving a broadcast program.

Claims (6)

A satellite digital multimedia broadcasting (DMB) system for transmitting AV (Audio or Video) channel access control information to a broadcasting module and a mobile communication system; A mobile communication system receiving AV channel access control information from the satellite DMB system and transmitting the received AV channel access control information to a communication module; A communication module for receiving AV channel access control information from the mobile communication system and manually or automatically connecting a service to a broadcasting module; And A broadcasting module for receiving AV channel access control information from the satellite DMB broadcasting system and being connected manually or automatically from the communication module; Receiving system of access control system channel information in satellite digital multimedia broadcasting via a communication network comprising a. The method according to claim 1, The communication module includes a storage module for receiving, storing, and utilizing a conditional access system (CAS) channel information. . A first step of the satellite DMB broadcasting system transmitting the AV channel access control information to the mobile communication system; A second step of receiving, by the mobile communication system, AV channel access control information from the satellite DMB broadcasting system and transmitting it to a communication module; A third step of receiving, by the communication module, AV channel access control information and storing it in a storage module; A fourth step of transmitting, by the broadcasting module, the AV channel access control information stored in the communication module to the broadcasting module; And A fifth step of the satellite DMB broadcasting system transmitting AV channel access control information to the broadcasting module and receiving the broadcasting module; Receiving method of the access control system channel information in a satellite digital multimedia broadcasting through a communication network comprising a. The method according to claim 3, In the second step, the mobile communication system transmits the AV channel access control information to the communication module through a communication channel. . The method according to claim 3, In the fifth step, the satellite DMB broadcasting system transmits AV channel access control information to the broadcasting module through a CAS channel. Way. The method according to claim 3, In the step 3, the communication module receives the AV channel access control information by downloading the access control information of the broadcast program channel from the communication network for several hours or days when the power of the communication module is turned on. How the module downloads the broadcast channel information once a day, pushes the broadcast channel information in the network of the mobile communication system, pulls the access control information of the broadcast program channel when the consumer needs, or A method for receiving channel information in an access control system in a satellite digital multimedia broadcasting through a communication network, characterized in that any one of a method using a mixture of the four methods.

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