KR20130048047A - Method for processing two or more scrambled contents in broadcast receiver - Google Patents
Method for processing two or more scrambled contents in broadcast receiver Download PDFInfo
- Publication number
- KR20130048047A KR20130048047A KR1020110112954A KR20110112954A KR20130048047A KR 20130048047 A KR20130048047 A KR 20130048047A KR 1020110112954 A KR1020110112954 A KR 1020110112954A KR 20110112954 A KR20110112954 A KR 20110112954A KR 20130048047 A KR20130048047 A KR 20130048047A
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- KR
- South Korea
- Prior art keywords
- data
- identifier
- packet
- scrambled
- descrambled
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
- H04N21/4181—External card to be used in combination with the client device, e.g. for conditional access for conditional access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4343—Extraction or processing of packetized elementary streams [PES]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4385—Multiplex stream processing, e.g. multiplex stream decrypting
Abstract
Description
The present invention relates to a method for processing two or more scrambled content in a broadcast receiver, and more particularly, to play or record two or more parental control programs through one condition access module.
There are many types of digital broadcasting services such as terrestrial broadcasting, satellite broadcasting, and cable broadcasting, and there are many channels or contents that can be watched through these various broadcasting types, and set-top boxes capable of receiving such digital broadcasting. Broadcast receivers such as TVs and televisions are also widely used.
In addition, a set-top box having a personal video recording (PVR) function for recording a desired broadcast program on a large storage medium such as a hard disk and watching it at a desired time, or stored in multiple channels or storage media A set-top box that supports Picture In Picture (PIP) function that can play content simultaneously is widely used, allowing users to watch two broadcast channels simultaneously, watch one broadcast channel, and record another broadcast channel. It satisfies the needs of users.
On the other hand, since broadcast data of a channel for which viewing or reception is restricted, such as a paid channel, is transmitted by being encrypted (scrambled), the user can only view the restricted channel through a set-top box equipped with a module for decrypting (descrambled) the broadcast data. You can watch a broadcast program. When this decryption function is contained in a card-like Conditional Access Module (CAM) that plugs into a Personal Computer Memory Card International Association (PCMCIA) slot, it is called a common interface (CI) type set-top box, and the host's operating system. When implemented in the form of middleware on an operating system (OS) or device driver, it is called an embedded conditional access system (CAS) set-top box.
However, in the conventional common interface type set-top box, one condition access module can process only a transport stream (TS) of one parental control channel, so that another parental control channel is reproduced when the broadcast channel is reproduced. Can not be played back at the same time, and other parental control channels can be recorded without decryption, and content recorded without being decrypted on the storage medium cannot be played back at the same time.
That is, a source that can be played on a set-top box (a plurality of broadcast programs received through a plurality of tuners, content recorded on a storage medium such as a hard disk or provided through a USB memory card, content connected to an external server, and transmitted) ), There is a problem in that a plurality of parental control channels can be simultaneously played back, or a parental control channel playback and a parental control channel cannot be decrypted or recorded without being encrypted at the same time.
Accordingly, the present invention has been made in view of the above situation and solves the above problems, and an object of the present invention is to provide a method for processing two or more multi-transport streams scrambled through one CAM to limit viewing. There is.
A method for processing two or more scrambled contents in a broadcast receiver according to an embodiment of the present invention for achieving the above object, different identifiers for each source in a predetermined unit of data of the scrambled content input from two or more sources. Adding and merging; Dividing the merged data based on a control signal, descrambling the divided data based on the identifier and adding the identifier to the descrambled data through one CAM; And separating the descrambled data based on the identifier, and removing and outputting the identifier.
In one embodiment, the predetermined unit of data is a packet of 188 bytes of the transport stream, an identifier of 1 byte may be added to the packet.
In one embodiment, the predetermined unit of data is a transport stream packet, and if at least one packet from one source comprises a packet identifier different from another packet from the same source, the merged data is associated with the identifier. It may be descrambled based on the packet identifier.
In one embodiment, the scrambled content may be a broadcast program scrambled in a CAS method input from two or more tuners.
In one embodiment, the scrambled content may include content scrambled and recorded in a storage medium included in the broadcast receiver.
In one embodiment, the separated descrambled data may be divided according to a source and reproduced or data for some sources may be stored.
According to another embodiment of the present invention, a broadcast receiver includes: one or more tuners for outputting a digital stream by tuning and demodulating a predetermined signal band in a received broadcast signal; A descrambler for descrambled scrambled content data including a CI controller and a CAM; A storage unit for storing the digital stream output from the tuner or content data descrambled by the descrambler; A playback unit including one or more playback modules for decoding the content data processed by the descrambler or the content data stored in the storage; And a control unit for controlling each element, wherein the CI control unit determines whether input data is scrambled, and inputs scrambled content data from two or more sources including the one or more tuners or storage units. If different data is added to the data of a predetermined unit of the scrambled content, different identifiers are added to each source and outputted to the CAM with a control signal indicating that an identifier is added to the data of a predetermined unit, and the CAM is configured to include the CI. Divide the merged data transmitted from the control unit according to the control signal, descramble the divided data based on the identifier, add and merge the corresponding identifier to the descrambled data, and output the merged data to the CI control unit; The CI control unit is configured to transmit the DI transmitted from the CAM. Cram block separating the processed data based on the identifier, and wherein removing the one or more outputs to the playback module or the storage unit to the identifier.
Accordingly, the broadcast receiver according to the present invention can receive and play two or more parental control channels through one CAM.
In addition, the broadcast receiver according to the present invention can receive and reproduce a parental control channel through one CAM, and record the data of another parental control channel on a recording medium in a state of being decoded.
In addition, the broadcast receiver according to the present invention is capable of reproducing or decoding and re-recording one or more contents which have been recorded in a non-decoded state on a recording medium while receiving and playing a parental control channel through one CAM.
1 illustrates a configuration of a broadcast receiver to which a method of processing two or more scrambled contents according to the present invention is applied.
2 illustrates a detailed configuration of a playback unit in the broadcast receiver of FIG.
FIG. 3 illustrates a detailed configuration of a CAS for descrambling a plurality of transport streams scrambled in the broadcast receiver of FIG. 1,
4 shows an example of a modification of a transport stream to be processed by one CAM according to the present invention.
Hereinafter, an embodiment of a method of processing two or more scrambled contents in a broadcast receiver according to the present invention will be described in detail with reference to the accompanying drawings.
The present invention can be applied to a broadcast receiver such as a set-top box or a television that receives digital broadcasting such as terrestrial broadcasting, satellite broadcasting, and cable broadcasting.
1 illustrates a configuration of a broadcast receiver to which a method for processing two or more parental control programs according to the present invention is applied.
As shown in FIG. 1, the
As shown in FIG. 2, the
When the
The
The
The
The
The digital stream selected and output from the
The
The
The content file stored in the
The
The configuration of the
The configuration of the
FIG. 3 illustrates a detailed configuration of a descrambler for descrambling a plurality of transport streams scrambled by the broadcast receiver of FIG. 1. Referring to FIG. 3, the
In general, one CAM supports only one TS, and since the PCMCIA interface having a 68-pin connecting CAM supports only one TS input and one TS output and does not support multiple TS, conventionally, it supports multiple TS. For this purpose, a method of preparing a plurality of CAMs has been proposed.
Transport stream packets of different sources may be distinguished from each other on the basis of PIDs included in the packet. However, even packets having different sources may have the same PID, and in this case, there is no way to distinguish packets of different sources.
Accordingly, in the present invention, 1 byte of unique ID information is added to the scrambled transport stream packet output from each tuner / demodulator so that a plurality of transport stream packets can be processed through one CAM. After merging them and delivering them to the CAM, the CAM can descramble a plurality of transport stream packets based on ID information.
The
If the transport stream is a scrambled transport stream, the
The
The
As illustrated in FIG. 4, the
The
The
When there are two or more PIDs in a packet corresponding to one source, the
The
When the
When the
When the scrambled transport stream is input from one source, the
The
Since the bit rate of the transport stream that can be handled by the CAM is about 96 Mbps, there may be limitations in processing multiple transport streams, but there is no problem in processing two transport streams.
Therefore, when the user instructs to watch a broadcast program other than the currently paid program on the PIP screen, one or more broadcast programs can be simultaneously viewed regardless of the type.
In addition, when the user selects to store a broadcast program other than the paid broadcast program currently being watched, the user can view and store the broadcast program regardless of the type of the program. For example, when both programs are Euro-broadcast programs with limited viewing, one program can be watched and the other program can be recorded on the storage medium in a descrambled state.
In addition, when the scrambled program is stored in the storage medium without the CAM, the user can simultaneously watch the scrambled program stored in the storage medium while watching the pay broadcast program.
The above-described preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve, change, and substitute various other embodiments within the technical spirit and scope of the present invention disclosed in the appended claims below. Or addition may be possible.
10: tuner 20: descrambler
21: CI control unit 22: CI module
23: CAM 30: Storage
40: playback unit 41: demultiplexer
42: parser 43: buffer memory
44: decoder 50: control unit
55: system memory 100: broadcast receiver
Claims (10)
Dividing the merged data based on a control signal, descrambling the divided data based on the identifier and adding the identifier to the descrambled data through one CAM; And
And separating the descrambled data based on the identifier, removing the identifier, and outputting the descrambled data.
And said predetermined unit of data is a packet of 188 bytes of a transport stream, and an identifier of one byte is added to said packet.
The predetermined unit of data is a transport stream packet, and if at least one packet from one source includes a packet identifier different from another packet from the same source, the merged data is based on the identifier and the packet identifier. A method for processing two or more scrambled content in a broadcast receiver, characterized in that it is descrambled.
And the scrambled content is a broadcast program scrambled in a CAS manner input from two or more tuners.
The scrambled content includes a scrambled content recorded in a storage medium included in the broadcast receiver.
And classifying the separated and output descrambled data according to a source, respectively, or storing data for a portion of the source, wherein the broadcast receiver processes two or more scrambled contents.
A descrambler for descrambled scrambled content data including a CI controller and a CAM;
A storage unit for storing the digital stream output from the tuner or content data descrambled by the descrambler;
A playback unit including one or more playback modules for decoding the content data processed by the descrambler or the content data stored in the storage; And
It is configured to include a control unit for controlling each element,
The CI control unit determines whether the input data is scrambled, and when scrambled content data is input from two or more sources including the one or more tuners or the storage unit, the CI control unit for each source of data of a predetermined unit of the scrambled content. Add and merge different identifiers and output them to the CAM together with a control signal indicating that the identifier is added to a predetermined unit of data;
The CAM divides the merged data transmitted from the CI control unit according to the control signal, descrambles the divided data based on the identifier, adds the identifier to the descrambled data, and merges the CI. Output to the controller,
And the CI control unit separates the descrambled data transmitted from the CAM based on the identifier, removes the identifier, and outputs the identifier to the one or more playback modules or the storage unit.
The predetermined unit of data is a packet of 188 bytes of a transport stream, and the descrambler adds an identifier of 1 byte to the packet.
If the predetermined unit of data is a transport stream packet and at least one packet from one source includes a packet identifier that is different from another packet from the same source, the CAM replaces the merged data with the identifier and the packet identifier. The broadcast receiver characterized in that descrambled based on.
The descrambler may descramble a broadcast program input from two or more tuners and scrambled in a CAS method, or scramble a broadcast program input from one tuner and scrambled in a CAS method and a CAS method input from the storage unit. And descrambles a single content.
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KR1020110112954A KR20130048047A (en) | 2011-11-01 | 2011-11-01 | Method for processing two or more scrambled contents in broadcast receiver |
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KR1020110112954A KR20130048047A (en) | 2011-11-01 | 2011-11-01 | Method for processing two or more scrambled contents in broadcast receiver |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111954047A (en) * | 2019-05-17 | 2020-11-17 | 武汉佳世创科技有限公司 | Method and device for descrambling two paths of code streams by single CAM card |
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2011
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111954047A (en) * | 2019-05-17 | 2020-11-17 | 武汉佳世创科技有限公司 | Method and device for descrambling two paths of code streams by single CAM card |
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