KR20130048047A - Method for processing two or more scrambled contents in broadcast receiver - Google Patents

Abstract

The present invention relates to a method of processing two or more scrambled content in a broadcast receiver. In one embodiment of the present invention, different identifiers are added for each source to data of a predetermined unit of scrambled content input from two or more sources, and the merged data is based on a control signal through one CAM. The divided data is descrambled based on the identifier, the identifier is added to the descrambled data and merged, and the descrambled data is separated based on the identifier and the identifier is removed and output. Can be. 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. Can be descrambled. Therefore, more than one parental control channel can be received and reproduced through one CAM.

Description

How to process more than one scrambled content in a broadcast receiver {Method for processing two or more scrambled contents in broadcast receiver}

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 broadcast receiver 100 according to the present invention includes a tuner / demodulator 10 (hereinafter simply referred to as a tuner), a descrambler (CAS) 20, It may include a storage 30, the playback unit 40, the control unit 50, the system memory 55, etc., two or more tuners (10 ₁ , 10 ₂ ) to receive two or more broadcast channels It may also include.

As shown in FIG. 2, the playback unit 40 may include a demultiplexer 41, a parser 42, a buffer memory 43, and a decoder 43. When the broadcast receiver 100 simultaneously reproduces and outputs two or more sources (for example, broadcast programs received on two broadcast channels, broadcast programs received on one broadcast channel, and contents stored in storage), the broadcast receiver 100 Two or more playback units 40 may be provided, and the broadcast receiver 100 supporting the PIP function may further include a mixer to synthesize A / V signals reproduced from two or more sources and output them as one image. It may be.

When the tuner 10, the demultiplexer 41, and the parser 42 are largely bundled into one broadcast receiver, two or more broadcast receivers may be provided, and the decoder 43 may include two or more decoding modules.

The tuner 10 tunes a signal band selected by a user from a broadcast signal (for example, a terrestrial wave, a cable, or a satellite broadcast signal) received through a connected RF signal line, for example, a coaxial cable, and through the tuned band. A digital signal that is modulated by Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), Vertical SideBand (VSB), or Orthogonal Frequency Division Multiplexing (OFDM), is demodulated and output as a digital stream.

The descrambler 20 converts the scrambled transport stream TS into a descrambled transport stream using the reception limiting module CAM, and will be described in detail later.

The storage 30 is for storing a large amount of data such as a hard disk and a solid state disk (SSD), and under the control of the controller 50, stores the output stream of the demultiplexer 41 or the tuner 10. The scrambled transport stream outputted from the C-SEC can be directly stored, or content received through an external network or an interface such as USB or IEEE1394 can be stored.

The demultiplexer 41 may include video, audio, text data, and management information (eg, PSI) belonging to a single program selected from a transport stream (MPTS: Multi-Program TS) of a multiplexed program in the output digital stream. Transport information transporting a transport stream is selected and output, and the basis information for the demultiplexer 41 to selectively output only the transport stream corresponding to one program in the digital stream is tuned before the output of the transport stream. A transport packet ID, i.e., PID, identified from Program Specific Information (PSI) (PAT, PMT, etc.) acquired and delivered on the channel.

The digital stream selected and output from the demultiplexer 41 is also stored in the storage 30 in the case of a specific mode, for example, a time-shift mode or a recording mode, in particular in the time-shift mode. The digital stream is read in a first-in first-out (FIFO) manner and applied to the parser 42.

The parser 42 removes a header of transport packets of each transport stream applied from the demultiplexer 41 or read and applied from the storage 30 under the control of the controller 50 to payload ) Collects only the data and outputs it in the form of Packetized Elementary Stream (PES) packet by dividing by type of video and audio.

The buffer memory 43 may refer to a PES packet for each type output through the parser 42 for each type (eg, video, audio, subtitle, text data, etc.) with reference to header information of the PES packet. In this case, the decoder 44 applies PES packets classified and stored in the buffer memory 43 to the corresponding internal decoding module according to their types, and decodes the original A. / V (audio / video) signal to restore the output.

The content file stored in the storage 30 is divided into small units and buffered in the buffer memory 43, and the decoder 44 may decode the data fed from the buffer memory 43 to play the corresponding content. have.

The controller 50 outputs a broadcast signal or a reproduction signal of content according to a user's request and / or a set condition, and outputs a space for storing data necessary for a control operation, a setting environment, or a process to be executed. An operating system for integrating a system memory 55 to provide hardware, and for executing command codes, such as firmware, to drive hardware resources of the broadcast receiver 100 and to perform appropriate signal and / or information exchange with the corresponding resources. (Not shown). The operation of the controller 50 or the operation of the application executed by the controller 50 may be performed by an appropriate mediation operation of the operating system (for example, specific functions provided by the components of FIG. 1 and the operating system, for example, input / output, etc.). , To perform an operation by requesting communication with the outside, checking the hardware status, a timer, etc.), and the description of the mediation operation is omitted.

The configuration of the broadcast receiver 100 illustrated in FIG. 1 may be integrated with a TV or may be configured in the form of a device added to a computer or a notebook. In addition, the controller 50 receives a request from a user through a general user interface, for example, a keypad, a remote controller, a touch pad, and if necessary, controls the OSD generator (not shown) according to the request. A video signal for guiding a response may be output, and the output video signal is visually represented by an electronic device having a conventional screen output function, for example, a TV or a monitor.

The configuration of the broadcast receiver 100 illustrated in FIG. 1 is just one example for showing the description of the present invention in detail and illustratively, and components of various functions not shown may be further included. However, the broadcast receiver implementing the concept and the subject matter of the present invention by executing a separate application or implementing the concepts and subject matter of the present invention exemplarily described below, even if the apparatus further includes components not illustrated. Unless excluded from the interpretation, it should, of course, be considered to be within the scope of the present invention.

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 descrambler 20 according to the present invention will be described in detail. do.

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 descrambler 20 is for scrambled broadcast restricted broadcast signal, and may include a CI controller 21, a CI module (PCMCIA) 22, and a CAM 23. When the 23 is an embedded form embedded in the broadcast receiver 100, the CI module 22 may be omitted, and the function of the CAM 23 may be implemented as a module of hardware, middleware, or software.

If the transport stream is a scrambled transport stream, the CI control unit 21 transmits it to the CI module 22 to perform a descrambling process, and the transmitted transport stream is a free broadcast signal. To Air) signal is bypassed to the CI module 22 and sent to the playback unit 40 or the storage 30.

The CI module 22 is provided with a PCMCIA slot into which a CAM 23 in the form of a smart card can be inserted, and provides the CAM 23 with a scrambled transport stream transmitted from the CI control unit 21. The transport stream descrambled by the CAM 23 is sent back to the CI controller 21.

The CAM 23 is a kind of smart card according to the PCMCIA standard inserted into the CI module 22. The CAM 23 descrambles the scrambled transport stream transmitted through the CI module 22 to perform the descramble of the CI module ( 22) to send.

As illustrated in FIG. 4, the CI control unit 21 according to the present invention, when two or more scrambled transport streams TS _s1 and TS _s2 are input, for example, two tuners 10 ₁ and a tuner. When viewing this type is limited broadcast signal is demodulated, or one is a limited broadcast signal viewing received from the tuner 10 and the data stored in the scrambled transport stream to the storage 30 are input through the (10 _2), each transformer A source identifier (ID _dem1 , ID _dem2 ) of 1 byte is added to the port stream packet, and the source stream packet is changed to a transport stream packet of 189 bytes, respectively, and merged (TS _sm ), through the CI module 22. Transfer to the CAM 23. In addition, the CI control unit 21 may generate a control signal (ctrl) indicating that a transport stream packet of 189 bytes is input or a source identifier is attached to the packet and transmit the generated control signal (ctrl) to the CAM 23.

The CAM 23 divides the merged transport stream packet TS _sm into units of 189 bytes by referring to a control signal ctrl transmitted from the CI control unit 21, and source identifiers ID _dem1 and ID. _dem2 ) to identify packets, analyze headers of packets identified by source identifiers to identify the type of CAS applied to the packet, descramble the payload, and _{assign the} source identifier to the descrambled packet. It is added again and merged (TS _dm ) and transmitted to the CI control unit 21 through the CI module 22.

The CAM 23 descrambles the packet unit. When descrambling the payload of the first input packet, the CAM 23 first analyzes the header of the packet to confirm the type of CAS applied to the packet, If there is a CAS of the identified type in the table stored for the CAS, and if the CAS is found, descrambles the data recorded in the payload of the packet by applying a descrambling algorithm for the CAS. The header may be combined with the scrambled payload. The CAM 23 may apply the same descramble algorithm based on the source identifier without going through a CAS type check or CAS search.

When there are two or more PIDs in a packet corresponding to one source, the CAM 23 may descramble a payload of a packet having the same PID based on the PIDs included in the packet identified by the source identifier. That is, descrambling may be performed based on both the source identifier and the PID included in the input packet.

The CI control unit 21 separates the merged transport stream packet data TS _dm for each source identifier and deletes one byte of source identifier from a packet of 189 bytes (TS _d1 , TS _d2 ). Output to the unit 40 and / or storage 30.

When the broadcast receiver 100 includes two or more playback units 40 separated from each other when the broadcast receiver 100 has a PIP function of simultaneously reproducing and outputting two or more sources, the broadcast receiver 100 is separated and output from the CI control unit 21. The transport stream packets TS _d1 and TS _d2 are inputted to different reproduction units 40, respectively, and are reproduced.

When the broadcast receiver 100 includes only one playback unit 40, one of the transport stream packets separated and output from the CI control unit 21 is reproduced through the playback unit 40, and the other trans The port stream packet may be stored as a transport stream packet descrambled in the storage 30.

When the scrambled transport stream is input from one source, the CI control unit 21 may add an arbitrary source identifier, change it to a packet of 189 bytes, and transmit it to the CAM 23, or transmit a source identifier. Instead of adding a control signal (ctrl) to the CAM 23 to inform that the transport stream packet of 188 bytes is input, in the latter case the CAM 23 is controlled from the CI control unit 21 According to the signal ctrl, the packet data transmitted may be cut in units of 188 bytes to descramble based on PID only, or the transmitted data may be cut in units of 189 bytes and descrambled in consideration of both source identifier and PID.

The CI control unit 21 receives a scrambled transport stream from one source (source 1), for example, the tuner 10, transmits a packet of 188 bytes without adding a source identifier, and transmits a control signal (ctrl). In the state of descrambling through the CAM 23 and outputting a descramble transport stream, the viewing restriction from another source (source 2), for example, another tuner 10, is requested by the user. When receiving a transport stream of a broadcast or receiving a scrambled transport stream stored in the storage 30, the transport stream in which the corresponding transport stream is scrambled from information included in a header of a newly input transport stream packet. Check if the packet is a packet, and if it is a scrambled transport stream, A different source ID is added to the packet of the stream and the transport stream packet inputted from the source 2 to be merged and transmitted to the CAM 23. The control signal ctrl is also changed and transmitted, and the CAM 23 is transmitted. In the packet descrambled and merged, the packet can be classified according to the source ID and the source ID can be removed from the packet and output.

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)

Merging by adding different identifiers for each source to data of a predetermined unit of scrambled content input from two or more sources;
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. The method of claim 1,
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 method of claim 1,
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. The method of claim 1,
And the scrambled content is a broadcast program scrambled in a CAS manner input from two or more tuners. The method of claim 1,
The scrambled content includes a scrambled content recorded in a storage medium included in the broadcast receiver. The method of claim 1,
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. One or more tuners for tuning and demodulating a predetermined signal band in a received broadcast signal to output a digital stream;
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. 8. The method of claim 7,
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. 8. The method of claim 7,
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. 8. The method of claim 7,
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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