KR100829099B1 - Apparatus for receiving digital broadcasting and control method thereof - Google Patents

Abstract

An apparatus for receiving digital broadcasting and a control method thereof are provided to download and execute applications of each channel by referring to AIT(application information table) of each channel when a channel map is not checked, thereby downloading the applications through user preference channels. An apparatus for receiving digital broadcasting comprises a broadcasting tuning part(10), a cable card(20), an additional data processing part(34), and a control part(60). The broadcasting tuning part receives broadcasting signals. The cable card decodes the broadcasting signal and performs user authentication. The additional data processing part includes channel maps using the additional data. The control part tunes monitor application containing channels and downloads/executes the monitor applications by referring to the channel maps and XAIT(extended application information table) when the channel map is checked, and downloads/executes the application of each channel, using AIT when the channel map is not checked.

Description

Apparatus for receiving digital broadcasting and control method

1 is a block diagram of a digital TV according to an embodiment of the present invention.

2 is a flowchart illustrating a method for controlling a digital TV according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: broadcasting tuning unit 20: cable card

30: broadcast signal processor 31: demultiplexer

32: video decoder 33: audio decoder

34: additional data processing unit 40: display unit

50: speaker 60: control unit

70: memory

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast receiver and a control method thereof, and more particularly, to a digital broadcast receiver and a control method for selectively processing an application depending on whether a channel map exists.

Digital broadcasting refers to a service that transmits text, pictures, graphics, audio, video, program packages, and other multimedia data at high speed to terminals such as set top boxes, computers, and mobile phones. Digital broadcasting provides TV programs and related information, life information, internet access, electronic commerce, and interactive entertainment using communication media such as cable, terrestrial and satellite waves.

On the other hand, in the case of cable broadcasting, Korea adopted the OCAP (Open Cable Application Platform) standard in September 2002 as a transmission and reception matching standard. OCAP refers to middleware that becomes an application production standard for interactive services in cable TV broadcasting.

The cable broadcast signal includes INB (In Band) data and OOB (Out of Band) data, which is out-of-band channel information. The INB data may include cable broadcast programs transmitted by each channel and information about applications for each channel. The OOB data may include channel related information EPG (Electronic Program Guide) and IPPV (Impulse-Pay-), which is information about paid channels. Per-View), Video on Demand (VOD) which is information about video on demand, and Additional Data Information (System Information, SI).

On the other hand, digital broadcasting, unlike analog broadcasting, does not use a high frequency channel number, which is a physical transmission channel (PTC), for channel tuning. Use logical channel numbers, including minor channel numbers. To this end, the open cable set-top box does not have a channel scan function unlike a general set-top box, and when a user selects a desired channel, the channel information is obtained by parsing a VCT (Virtual Channel Table) included in the SI in real time. Tune the desired channel from the information.

According to the OCAP specification (OC-SP-OCAP 1.0-I16-050803), for an unbound application of OCAP, when there is no code download from the SO after initializing the cable card, extended application information included in broadcast data Receive the Extended Application Information Table (XAIT), run the Monitor Application with reference to the XAIT, and launch the unbound application executed by the Monitor application (OC-SP-OCAP 1.0-). 20.22.3 of I16-050803). Here, the monitor application is to control the unbound application, and must be executed before other unbound applications.

Conventionally, when it is necessary to execute a monitor application after initializing such as interface between a cable card and a digital broadcasting receiver, if there is no channel map, only the information on the application included in the XAIT does not know the channel information of each application. Could be difficult to tune to the user's desired channel.

Therefore, there is a need for a method for tuning an application provided by the headend to a user desired channel without channel information of a channel map.

Accordingly, an object of the present invention is to provide a digital broadcast receiver and a control method of a digital broadcast receiver capable of effectively downloading and executing an application when there is no channel map configured in the digital broadcast receiver.

According to an aspect of the present invention, there is provided a digital broadcast receiver, comprising: a broadcast tuning unit for receiving a broadcast signal; A cable card for processing decryption of the received broadcast signal and user authentication; An additional data processor configured to process additional data output from the cable card and to configure a channel map using the additional data; And when the channel map is identified, the monitor application is downloaded and executed by referring to the channel map and an extended application information table (XAIT) to tune a channel including the monitor application, and the channel map is confirmed. If not, it can be achieved by the digital broadcasting receiver, comprising a control unit for downloading and executing the application for each channel by referring to the application information table (AIT) for each channel.

In addition, when the configured channel map is checked while the application for each channel is downloaded and executed with reference to the AIT for each channel, the controller refers to the channel map and the XAIT to tune a channel including the monitor application. The monitor application can be downloaded and executed.

On the other hand, an object of the present invention is to provide a method for controlling a digital broadcasting receiver.

Receiving a broadcast signal; Processing the decryption of the received broadcast signal and user authentication to output the broadcast signal; Processing the output additional data and constructing a channel map using the additional data; Checking whether the configured channel map exists; When the channel map is identified, the monitor application is downloaded and executed by referring to the channel map and XAIT to tune the channel including the monitor application. If the channel map is not confirmed, the channel map is referred to, referring to the AIT for each channel. It can also be achieved by a method of controlling a digital broadcasting receiver, comprising the step of downloading and executing an application.

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

1 is a block diagram of a digital TV according to an embodiment of the present invention.

Referring to FIG. 1, a digital TV according to an embodiment of the present invention includes a broadcast tuning unit 10, a cable card 20, a broadcast signal processing unit 30, a display unit 40, a speaker 50, and a controller ( 60 and a memory 70.

The broadcast tuning unit 10 receives a broadcast signal and tunes the received broadcast signal to a reception band selected by a user. The broadcast tuning unit 10 includes an antenna for receiving a broadcast signal, a tuner for tuning a broadcast channel, an INB data demodulator, and an OOB data demodulator.

The cable card 20 processes decryption and user authentication of the received broadcast signal. The cable card 20 is a device that separates a POD (Point Of Deployment) module from a main body of a digital cable set-top box, including a Conditional Access System (CAS) system, which is adopted for copy protection and limited access to broadcast contents. By defining a standard interface between a set-top box and a POD module, anyone can create a set-top box by just matching this POD interface. When the digital TV is turned on or the cable card 20 is inserted or replaced, the SAS (Specific Application Support) protocol is used as a communication resource for the interface between the set-top box and the cable card 20. This process is referred to as cable card 20 initialization. Then, the cable card 20 and the head end process user authentication and decryption of the received broadcast signal by exchanging mutual certificates, and the broadcast signal is descrambled according to the subscriber requirements of the user and output. Here, the headend is a kind of broadcasting station, which is to produce and compress a digital broadcasting signal and transmit the digital broadcasting signal to a digital broadcasting receiver.

The broadcast signal processor 30 includes a demultiplexer 31, a video processor 32, an audio processor 33, and an additional data processor 34.

The demultiplexer 31 demultiplexes the broadcast signal and the OOB data output through the cable card 20 into a video signal, an audio signal, and additional data.

The video decoder 32 decodes the demultiplexed video signal and outputs it to the display unit 40. The audio decoder 33 decodes the demultiplexed audio signal and outputs it to the speaker 50. The additional data processor 34 ) Processes the demultiplexed additional data and constructs a channel map using the additional data. Additional data includes XAIT and AIT. Here, XAIT is an extended application information table that contains information about all applications and is transmitted through OOB, and AIT is transmitted through INB as an application information table for each channel. In addition, the channel map is configured by real-time parsing the VCT of the SI transmitted through the OOB to obtain information about the channel, and includes a logical channel number and broadcast information corresponding to the physical channel number.

The controller 60 is responsible for the overall control of the digital TV, and may be implemented as a micro controller unit (MCU), a microcomputer (Micom), or the like. In particular, when the digital TV is turned on or the cable card 20 is inserted or replaced, the control unit 60 passes through the initialization of the cable card 20, and whether there is a channel map configured by the additional data processing unit 34. Optionally handle XAIT or AIT. That is, when the configured channel map is confirmed, the controller 60 parses the channel information of the monitor application with reference to the channel map and the XAIT and transmits a control signal to the broadcast tuning unit 10 to tune to a channel including the monitor application. Control to download and run the monitor application. On the other hand, if the configured channel map is not confirmed, the controller 60 refers to the AIT for each channel to download and execute the application for each channel. Here, the extended application information table (XAIT) is an extended application information table, which includes channel information and other information about all applications transmitted through a cable, and is transmitted through an out of band (OBB). The application information table (AIT) is an application information table for each channel and includes information on an application of each channel.

Applications downloaded from the additional data processor 34 are stored in the memory 70.

2 is a flowchart illustrating a method for controlling a digital TV according to an embodiment of the present invention.

Hereinafter, an operation procedure of a control method of a digital TV according to an embodiment of the present invention will be described in detail with reference to FIG. 2.

When the power of the digital TV or the cable card 20 is inserted or replaced, the initialization of the cable card 20 for the interface between the set-top box and the cable card 20.

The multiplexed broadcast signal is received through the broadcast tuning unit 10 (S101).

Through the interworking between the cable card 20 and the headend, the user is authenticated and the decryption of the received broadcast signal is processed so that the broadcast signal is descrambled in accordance with the subscriber requirements of the user (S102).

After the descrambled broadcast signal is demultiplexed by the demultiplexer 31, the additional data processor 34 constructs a channel map using the demultiplexed additional data (S103).

It is checked whether or not a channel map constructed by the control unit 60 exists (S104).

When the channel map is confirmed, the controller 60 downloads and executes the monitor application by tuning to a channel including the monitor application with reference to the channel map and the XAIT (S105).

If the channel map is not confirmed, the controller 60 downloads and executes the application for each channel by referring to the AIT for each channel (S106).

Although some embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that modifications may be made to the embodiment without departing from the spirit or spirit of the invention. . In particular, although the above-described embodiment is limited to digital TV only, those skilled in the art will appreciate that the present invention can be applied to any device capable of receiving digital cable broadcasting other than digital TV. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

As described above, according to the present invention, when there is no channel map configured in the digital broadcasting receiver, there is provided a digital broadcasting receiver and a control method of the digital broadcasting receiver for effectively downloading and executing an application to a user desired channel. This can provide

Claims (3)

In the digital broadcasting receiver, A broadcast tuning unit for receiving a broadcast signal; A cable card for processing decryption of the received broadcast signal and user authentication; An additional data processor configured to construct a channel map using the additional data output from the cable card; And When the channel map is identified, the monitor application is downloaded and executed by referring to the channel map and an extended application information table (XAIT) to tune a channel including the monitor application, and the channel map is not confirmed. Otherwise, a control unit for downloading and executing the application for each channel by referring to an application information table (AIT) for each channel. The method of claim 1, If the configured channel map is checked while downloading and executing the application for each channel by referring to the AIT for each channel, the controller may refer to the channel map and the XAIT to tune a channel including the monitor application. Digital broadcasting receiver for downloading and executing the monitor application. In the control method of the digital broadcasting receiver, Receiving a broadcast signal; Outputting additional data by processing decryption of the received broadcast signal and user authentication; Constructing a channel map using the output additional data; Checking whether the configured channel map exists; And When the channel map is identified, the monitor application is downloaded and executed by referring to the channel map and XAIT to tune the channel including the monitor application. If the channel map is not confirmed, the channel map is referred to, referring to the AIT for each channel. The control method of the digital broadcasting receiver comprising the step of downloading and executing the application.

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