KR20110065732A - System and method for digital broadcasting service - Google Patents

Abstract

PURPOSE: A digital broadcasting transceiving system and digital broadcasting receiving method are provided to prevent an illegal watching for digital broadcasting of non-member. CONSTITUTION: A digital broadcasting transmitter(200) generates a digital transport stream includes a different packet identifier per channel. A digital broadcasting receiver(100) extracts the packet identifier in the digital transmission stream. A digital broadcasting transmitter compares the extracted packet ID with mapping data. The digital broadcasting receiver outputs the received digital transport stream.

Description

Digital Broadcast Transceiver System and Digital Broadcast Receiving Method {SYSTEM AND METHOD FOR DIGITAL BROADCASTING SERVICE}

The present invention relates to a digital broadcast transmission and reception system, a digital broadcast reception apparatus, and a digital broadcast reception method for preventing a non-subscriber's digital broadcasting city office.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Korea Communications Commission. ].

Recently, digital broadcasting, which is paid for, has been widely distributed, and the number of users is increasing continuously. When a subscriber pays a predetermined fee, a broadcasting station that provides digital broadcasting provides a digital broadcasting reception apparatus of each broadcasting company. Accordingly, subscribers can receive digital cable broadcasting by receiving broadcast services of respective broadcasters using the digital broadcasting receiver.

On the other hand, the user using the digital broadcast may have a non-subscriber in addition to the subscriber. In other words, non-subscribers who are not subscribed to broadcasters frequently receive digital broadcasts illegally. This causes enormous economic loss from the point of view of the broadcaster providing the digital broadcast, and the problem caused by copyright infringement occurs when the digital broadcast is not limited to the city government but illegally copied. Therefore, the city prevention prevention technology using the scramble signal was introduced.

Specifically, the broadcaster transmits the scramble signal for preventing the city hall in the digital broadcast. When the scramble signal is detected, the digital broadcast reception apparatus determines whether to view the right to watch the corresponding broadcast, and descrambles only when there is a right to view the broadcast. However, since not all digital broadcasts contain scrambled signals, there is a problem that non-subscribers can still listen to broadcasts that do not include scrambled signals.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a digital broadcasting transmission / reception system and a digital broadcasting reception apparatus capable of preventing a digital broadcasting city office of a non-subscriber by using a packet identifier included in a digital transport stream. And to provide a digital broadcast receiving method.

The digital broadcast transmission / reception system according to an embodiment of the present invention provides a digital broadcast transmission device for generating a digital transport stream including a different packet identifier for each channel, and when a digital transport stream for a selected channel is received from the digital broadcast transmission device. The packet identifier is extracted from the received digital transport stream, and the extracted packet identifier is compared with mapping data to determine whether the packet identifier corresponds to the packet identifier for the selected channel. It includes a digital broadcast receiving device for outputting.

Meanwhile, an apparatus for receiving digital broadcasting according to an embodiment of the present invention may include a storage unit for storing mapping data in which different packet identifiers are recorded for each channel, and a digital transport stream including a packet identifier for a selected channel from the digital broadcasting transmitter. The receiving unit extracts a packet identifier for the selected channel from the received digital transport stream, compares the extracted packet identifier with a packet identifier recorded in the mapping data, and determines whether or not it matches. And a control unit for outputting the digital transport stream.

On the other hand, the digital broadcast reception method according to an embodiment of the present invention, receiving a digital transport stream including a packet identifier for the selected channel from the digital broadcast transmission device, extracting the packet identifier from the received digital transport stream And comparing the extracted packet identifier with mapping data to determine whether it matches the packet identifier for the selected channel and outputting the received digital transport stream if the determination is identical.

According to the present invention, it is possible to output the digital transport stream only when the packet identifier included in the digital transport stream and the packet identifier of the mapping data stored in the digital broadcast reception device are matched, thereby preventing the digital broadcasting city office of the non-subscriber. Will be.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terminology used herein is a term used to properly express a preferred embodiment of the present invention, which may vary according to a user, an operator's intention, or a custom in the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

1 is a diagram illustrating a digital broadcast transmission and reception system according to an embodiment of the present invention. Referring to FIG. 1, the digital broadcast transmission / reception system includes a digital broadcast reception device 100, a digital broadcast transmission device 200, and a subscriber management server 300.

Although the digital broadcast transmission and reception system illustrated in FIG. 1 includes only one digital broadcast reception device 100, this is for convenience of description and may include a plurality of digital broadcast reception devices.

When the viewer applies for subscription to the digital broadcasting service, the digital broadcasting service provider newly installs the digital broadcasting receiving apparatus 100 on the viewer side. In this process, the digital broadcast transmission device 200 installed on the digital broadcast service provider side assigns a unique identifier (ID) to the newly installed digital broadcast reception device 100 and transmits the unique ID to the subscriber management server 300. do. Accordingly, the subscriber management server 300 stores and manages the unique ID of the subscriber.

In addition, the digital broadcast transmission device 200 generates mapping data. Here, the mapping data is data in which different packet identifiers (PIDs) are recorded for each channel. For example, digital broadcasting by recording the packet identifier for channel 1 as "10", the packet identifier for channel 2 as "20", and the packet identifier for channel 3 as "30". The packet identifiers of all channels supported by the transmitter 200 are recorded. In this case, packet identifiers for all channels can be set to any value and recorded.

2 is a diagram illustrating mapping data according to an embodiment of the present invention. Referring to the mapping data shown in FIG. 2, the channels are arranged in ascending order, and the packet identifier may be increased by 10 according to the channel. In addition, the mapping data shown in FIG. 2 is merely an example, and the channel sort order may be in descending or random order, and the packet identifier may have an arbitrary value.

The digital broadcast transmission device 200 stores the mapping data itself and simultaneously transmits the mapping data to the digital broadcast reception device 100. In addition, the digital broadcast transmission device 200 may periodically update the mapping data. For example, the mapping data may be updated by changing a packet identifier of each channel on a monthly basis, and may be transmitted to the subscribed digital broadcasting reception apparatus 100 every time it is updated.

The digital broadcast reception device 100 receives and stores mapping data from the digital broadcast transmission device 200.

Meanwhile, when the channel selection signal is received, the digital broadcast transmission apparatus 200 encodes the digital transport stream for the selection channel and then remultiplexes the processing. In the remultiplexing process, a packet identifier is set in the digital transport stream for the selected channel. Specifically, a packet association table (PAT) is detected in the digital transport stream for the selected channel. The PAT detects a PMT (Program Map Table) packet identifier. In general, the PMT packet identifier is recorded as "0" regardless of the channel. However, the digital broadcast transmitter 200 sets the PMT packet identifier included in the PAT to a specific value other than "0" during the remultiplexing process. In this case, the value set in the PMT packet identifier may be a packet identifier recorded in the mapping data. For example, when the selected channel is "channel 1", the PMT packet identifier region is detected in the digital transport stream for channel 1, the packet identifier corresponding to channel 1 is extracted from the mapping data, and set to the PMT packet identifier. If the packet identifier corresponding to channel 1 in the mapping data is "10", the PMT packet identifier of the digital transport stream may be recorded as "10". In this manner, in the process of remultiplexing the digital transport stream for the selected channel, the PMT packet identifier is set to a value other than "0" to transmit the digital transport stream to the digital broadcast reception device 100.

On the other hand, the digital broadcast reception apparatus 100 demultiplexes the digital transmission stream for the selected channel. Then, the packet identifier is extracted from the digital transport stream. In this case, the packet identifier is a PMT packet identifier and can be extracted by detecting the PAT in the digital transport stream and detecting the PMT packet identifier in the PAT.

When the digital broadcast stream is received, the digital broadcast reception device 100 reads the mapping data and extracts a packet identifier corresponding to the selected channel. The packet identifier is then compared with the PMT packet identifier extracted from the digital transport stream.

If the PMT packet identifier extracted from the digital transport stream and the packet identifier extracted from the mapping data match, the digital transport stream is output. On the other hand, if the two packet identifiers do not match, the digital transport stream cannot be detected and the digital transport stream cannot be output normally.

According to the digital broadcast transmission / reception system illustrated in FIG. 1, the digital broadcast reception device in which mapping data is not stored cannot output a digital transport stream received from the digital broadcast transmission device 200. Thus, non-subscribers can be prevented from watching digital broadcasting.

3 is a block diagram illustrating a configuration of a digital broadcast receiving apparatus according to an embodiment of the present invention. Referring to FIG. 3, the digital broadcast receiver 100 includes a receiver 110, a demultiplexer 120, a controller 130, a storage 140, a decoder 150, and an output 160. do.

The receiver 110 receives a digital transport stream for a selected channel from the digital broadcast transmission device 200. The demultiplexer 120 demultiplexes the digital transport stream. The digital transport stream is remultiplexed by the digital broadcast transmission device 200 and then transmitted to the digital broadcast reception device 100, and a process of demultiplexing it is necessary.

The storage 140 stores mapping data in which different packet identifiers are recorded for each channel. The mapping data is generated by the digital broadcast transmission device 200 in which the digital broadcast reception device 100 is registered, and may be the same as the mapping data stored in the digital broadcast transmission device 200.

The controller 130 compares the packet identifier included in the digital transport stream with the packet identifier included in the mapping data and determines whether the packet identifier is identical. In detail, the controller 130 extracts a packet identifier from the digital transport stream. At this time, the packet identifier is a PMT packet identifier, and the digital transport stream is analyzed to extract it.

4 is a diagram illustrating the structure of a digital transport stream. Referring to FIG. 4, the digital transport stream is an MPEG-2 transport stream and is composed of consecutive transport stream packets (Ts Packets).

Each transport stream packet is a 188-byte fixed length packet, which is composed of a header area of 4 bytes and a payload area of 184 bytes. In order to extract the PMT packet identifier from the transport stream packet, the controller 130 first detects PSI (Program Specific Information) in the payload region. This PSI includes PAT, PMT, Conditional Access Table (CAT), and Network Information (NIT) associated with the program information.

Since the PMT packet identifier is included in the PAT, the controller 130 may detect the PAT from the PSI and then extract the PID packet identifier from the PAT.

Meanwhile, the controller 130 reads mapping data from the storage 140 and extracts a packet identifier corresponding to the selected channel. In this case, the mapping data may have the same form as shown in FIG. 2. That is, different packet identifiers corresponding to respective channels may be set. Using such mapping data, when the selected channel is "channel 1", "10" which is a packet identifier corresponding to channel 1 can be detected.

The controller 130 compares the PMT packet identifier extracted from the digital transport stream with the packet identifier extracted from the mapping data and determines whether or not they match. As a result of this determination, if the two packet identifiers match, the controller 130 extracts the PMT using the PMT packet identifier. In this case, the PMT includes packet identifiers of video data and audio data associated with the program. Therefore, the video data and the audio data are extracted from the digital transport stream using the packet identifiers of the video data and the audio data. The extracted video data and audio data are decoded through the decoder 150 and output through the output unit 160. In this case, the output unit 160 may include a display unit 161 for outputting image data and a speaker 163 for outputting audio data.

On the other hand, if the packet identifier extracted from the digital transport stream and the packet identifier extracted from the mapping data do not match or the mapping data is not stored in the digital broadcast reception apparatus 100, the digital transport stream may not be output. That is, if packet data corresponding to the packet identifier extracted from the digital transport stream is not stored in the digital broadcast reception device 100, the digital broadcast reception device 100 may not know the PMT packet identifier, and thus the image data may not be stored in the digital transport stream. And voice data cannot be extracted. Therefore, it is possible to prevent the city office using the digital broadcasting reception apparatus that the subscription period has expired or is not subscribed to.

5 is a flowchart illustrating a digital broadcast reception method according to an embodiment of the present invention. FIG. 5 relates to a digital broadcast reception method of a digital broadcast reception device of the present invention. First, a digital transport stream including a packet identifier for a selected channel is received from a digital broadcast transmission device at a digital broadcast service provider (S510). .

Thereafter, the digital broadcast reception device 100 extracts a packet identifier from the received digital transport stream (S520). Here, the packet identifier may be a PMT packet identifier included in the PAT of the digital transport stream. Accordingly, the packet identifier may be extracted by first detecting the PAT in the digital transport stream and then detecting the PID packet identifier in the PAT.

The digital broadcast reception apparatus 100 compares the packet identifier extracted from the digital transport stream with the packet identifier of the pre-stored mapping data (S530), and determines whether the two packet identifiers match (S540). Here, the mapping data is data which records different packet identifiers for each channel.

As a result of the determination, when the packet identifier extracted from the digital transport stream and the packet identifier of the prestored mapping data match (S540: Y), the digital transport stream is output (S550). On the other hand, if the packet identifier extracted from the digital transport stream and the packet identifier of the pre-stored mapping data do not match (S540: N), the digital transport stream is not output. Therefore, even if the subscription period has expired or the digital transmission stream is received using the unsubscribed digital broadcast receiving device, the digital transport stream cannot be output unless the mapping data is stored.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

1 is a diagram illustrating a digital broadcast transmission and reception system according to an embodiment of the present invention.

2 is a diagram illustrating mapping data according to an embodiment of the present invention.

3 is a block diagram illustrating a configuration of a digital broadcast receiving apparatus according to an embodiment of the present invention.

4 is a diagram illustrating the structure of a digital transport stream.

5 is a flowchart illustrating a digital broadcast reception method according to an embodiment of the present invention.

<Description of Signs for Major Configurations of Drawings>

100: digital broadcast receiving device

110: receiver 120: demultiplexer

130: control unit 140: storage unit

150: decoder 160: output unit

Claims (10)

A digital broadcast transmission device for generating a digital transport stream including different packet identifiers for each channel; And When the digital transport stream for the selection channel is received from the digital broadcast transmission device, the packet identifier is extracted from the received digital transport stream, and the extracted packet identifier is compared with mapping data to match the packet identifier for the selection channel. A digital broadcast reception device for determining whether or not to output the digital transmission stream Digital broadcast transmission and reception system comprising a. The method of claim 1, The digital transport stream includes a Program Association Table (PAT), the PAT includes a Program Map Table (PMT) packet identifier, And the digital broadcast receiving apparatus extracts the packet identifier by detecting the PMT packet identifier in the digital transport stream. A storage unit for storing mapping data in which different packet identifiers are recorded for each channel; A receiver configured to receive a digital transport stream including a packet identifier for a selected channel from the digital broadcast transmitter; The packet identifier for the selected channel is extracted from the received digital transport stream, and the extracted packet identifier is compared with the packet identifier recorded in the mapping data to determine whether to match. Control to output Digital broadcast receiving device comprising a. The method of claim 3, wherein The digital transport stream includes a Program Association Table (PAT), the PAT includes a Program Map Table (PMT) packet identifier, The control unit, And extracting the packet identifier by detecting the PMT packet identifier in the digital transport stream. The method of claim 3, wherein The control unit, And detecting a PMT including PIDs of video data and audio data related to a program in the digital transport stream, and outputting video and audio corresponding to PIDs of the video data and the audio data. The method of claim 5, A demultiplexer configured to demultiplex the received digital transport stream; And A decoder for decoding a video and audio corresponding to the packet identifier D of the video data and the audio data. Digital broadcast receiving device further comprising. Receiving a digital transport stream including a packet identifier for a selected channel from a digital broadcast transmitting device; Extracting the packet identifier from the received digital transport stream and comparing the extracted packet identifier with mapping data to determine whether it matches the packet identifier for the selected channel; And Outputting the received digital transport stream if it is determined as a result of the determination; Digital broadcast receiving method comprising a The method of claim 7, wherein The digital transport stream includes a Program Association Table (PAT), the PAT includes a Program Map Table (PMT) packet identifier, Determining whether or not match the packet identifier for the selected channel, And extracting the packet identifier by detecting the PMT packet identifier in the digital transport stream. The method of claim 8, Outputting the received digital transport stream, Detecting a PMT including a PID of video data and audio data related to a program in the digital transport stream; And Outputting the video and audio corresponding to the PID of the video and audio data; Digital broadcast receiving method comprising a. 10. The method of claim 9, Demultiplexing the received digital transport stream; And Decoding the video and audio corresponding to a packet identifier of the video and audio data; Digital broadcast receiving method further comprising.

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