WO2006080724A1 - Digital broadcasting conditional access device having multiple contents descrambling, and method for the same - Google Patents

Digital broadcasting conditional access device having multiple contents descrambling, and method for the same Download PDF

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Publication number
WO2006080724A1
WO2006080724A1 PCT/KR2005/003339 KR2005003339W WO2006080724A1 WO 2006080724 A1 WO2006080724 A1 WO 2006080724A1 KR 2005003339 W KR2005003339 W KR 2005003339W WO 2006080724 A1 WO2006080724 A1 WO 2006080724A1
Authority
WO
WIPO (PCT)
Prior art keywords
content
descrambling
screen
scramble
specific
Prior art date
Application number
PCT/KR2005/003339
Other languages
French (fr)
Inventor
Jae Young Ko
Original Assignee
Kaonmedia Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020050004530A external-priority patent/KR100713558B1/en
Application filed by Kaonmedia Co., Ltd. filed Critical Kaonmedia Co., Ltd.
Publication of WO2006080724A1 publication Critical patent/WO2006080724A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • 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
    • H04N21/4104—Peripherals receiving signals from specially adapted client devices
    • H04N21/4135—Peripherals receiving signals from specially adapted client devices external recorder
    • 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
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42661—Internal components of the client ; Characteristics thereof for reading from or writing on a magnetic storage medium, e.g. hard disk drive
    • 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
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/43607—Interfacing a plurality of external cards, e.g. through a DVB Common Interface [DVB-CI]
    • 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
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4367—Establishing a secure communication between the client and a peripheral device or smart card
    • 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
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption
    • 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
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4408—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
    • 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
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4622—Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet
    • 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
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]

Definitions

  • the present invention relates to a digital broadcasting conditional access device and a method for the same for descrambling a scrambled content, and more particularly, to a technique of routing multiple of content provided by multiple of input modules (e.g., tuner, hard disk, etc.) to descrambling modules that are not performing content de- scrambling respectively in order to be descrambled, upon identifying descrambling modules which are performing content descrambling based on header information in a descrambled content.
  • input modules e.g., tuner, hard disk, etc.
  • a content is transmitted via a satellite etc. upon being inserted a scramble data in order to prevent any viewing by non- subscribers. Therefore, a set-top box having a digital broadcasting conditional access device (e.g., DVB-CI) descrambles and outputs a scrambled data.
  • a digital broadcasting conditional access device e.g., DVB-CI
  • PIP picture-in-picture
  • the conventional set-top box has a problem in that it cannot perform simultaneous real-time descrambling of multiple paid broadcasting content provided by multiple of input modules (e.g., tuner, hard disk, etc.) or scrambled content stored in a hard disk, etc. That is, the conventional digital conditional access device cannot perform real-time analysis for a descrambling operation, resulting in a direct configuration of one input module and one descrambling module. Thus, there is a problem in that multiple scrambled content provided by multiple of input modules cannot be simultaneously descrambled in real time.
  • input modules e.g., tuner, hard disk, etc.
  • an object of the present invention is to provide a technique of routing multiple of content provided by multiple of input modules (e.g., tuner, hard disk, etc.) to descrambling modules that are not performing content de- scrambling respectively in order to be descrambled, upon identifying descrambling modules which are performing content descrambling based on header information in a descrambled content.
  • input modules e.g., tuner, hard disk, etc.
  • the present invention it is advantageous in that it is possible to perform the simultaneous real-time descrambling of multiple of paid broadcasting content provided by multiple of input modules (e.g., tuner, hard disk, etc.) or stored in a hard disk, etc., and thus, through a PIP function a user may accomplish a real-time content reproduction and view or record a live content on channels in a simultaneous manner.
  • input modules e.g., tuner, hard disk, etc.
  • a user may accomplish a real-time content reproduction and view or record a live content on channels in a simultaneous manner.
  • FIG. 1 is a block diagram of an embodiment of a digital set- top box to which the present invention is applied.
  • FIG. 2 is a block diagram of the configuration of a multiple content descrambling module according to an embodiment of the present invention.
  • FIG. 3 is a flowchart illustrating a multiple content descrambling method according to an embodiment of the present invention.
  • Fig. 1 is a block diagram of an embodiment of a digital set-top box to which the present invention is applied.
  • an encrypted content is referred to as “a scramble-content”
  • a descrambled content is referred to as "a descramble-content.”
  • the digital set-top box to which the present invention is applied includes a 1 -channel digital video recorder (ICH DVR) (called “1 -channel digital home security recorder”) which comprises a video A/D converter 10 for converting an analog video signal from a television (TV) or a camera device into a digital video signal; an MPEG encoder 11 for encoding the digital video signal from the video A/D converter 10 into MPEG data format; and an Ethernet card (LAN Card) 12 charging of the Internet connection of the digital set-top box.
  • ICH DVR 1 -channel digital video recorder
  • LAN Card Ethernet card
  • the digital set-top box further includes a dual digital broadcasting recorder
  • PVR personal video recorder
  • PVR personal video recorder
  • PVR personal video recorder
  • a digital video broadcasting conditional access device e.g., DVB-CI
  • DVB-CI digital video broadcasting conditional access device
  • MPEG-TS MPEG transport stream
  • ATAPI hard disk connection interface
  • the digital set-top box further includes basic components for a digital broadcasting conditional access function and digital broadcasting receiving, recording, or outputting functions.
  • a user may encode a captured image by a camera into an MPEG format moving picture and transmit the moving picture to a computer which connected to an Internet, or may view on a television a digital video broadcasting program which received via antenna.
  • FIG. 2 is a block diagram of the configuration of a multiple content descrambling module according to an embodiment of the present invention.
  • the digital video broadcasting conditional access device 15 will be described below by way of example as having two descrambling modules, it will be understood by those skilled in the art that the digital video broadcasting conditional access device 15 may comprise multiple of descrambling modules and multiple of PIP processors, and multiple of PIP screens may be implemented on a TV.
  • the multiple content descrambling module comprises a first descrambling module (CAMl) 50, a second de- scrambling module (CAM2) 51, a router 52, and a demultiplexer 53.
  • the demultiplexer 53 includes a first screen processor (hereinafter, referred to as "PIPl processor”) 53a and a second screen processor (hereinafter, referred to as "PIP2 processor”) 53b.
  • each of the first and second tuners 13 and 14 performs frequency tuning of paid digital video broadcasting signals, i.e., scramble-content on different channels received from a satellite, etc.
  • the hard disk 18 stores the scramble-content, and different content is simultaneously displayed in PIPl and PIP2 screens in real time using a picture-in-picture function of a television (TV) 30.
  • the router 52 identifies a descrambling module, which is performing a content de- scrambling operation, based on header information of the content descrambled by the first descrambling module 50 or the second descrambling module 51.
  • the router 52 routes the scramble-content, which is input from the first tuner 13, the second tuner 14 or the hard disk 18, to a descrambling module that is not performing a content descrambling operation, so that the scramble-content can be descrambled by the de- scrambling module and then routed to a corresponding PIP processor.
  • the PIP processor outputs the descramble-content to the TV 30 so that the content can be displayed in a corresponding PIP screen.
  • the router 52 checks a change in the content header before and after the content is descrambled by the descrambling module, i.e., a change in packetizing between a header of scramble-content input into the descrambling module and a header of descramble-content output from the descrambling module (e.g., a change in bit (" 1" ⁇ "0") to identify the descrambling module that is actually descrambling the scrambled content.
  • a change in packetizing between a header of scramble-content input into the descrambling module and a header of descramble-content output from the descrambling module e.g., a change in bit (" 1" ⁇ "0"
  • the PIPl screen is activated in response to a user's request etc., i.e., when a user wants to view a specific paid broadcasting program in the PIPl screen, corresponding scramble-content is descrambled and displayed in the PIPl screen.
  • the router 52 When the router 52 has identified the descrambling module that is performing a content descrambling operation (i.e., a descrambling module that is not performing a content descrambling operation) as described above, and the PIP2 screen is activated in response to a user's request etc.
  • a content descrambling operation i.e., a descrambling module that is not performing a content descrambling operation
  • the router 52 selects (verifies) a de- scrambling module that can descramble scramble-content to be displayed in the PIP2 screen and then forms a loop between a means (the first tuner 13, the second tuner 14 or the hard disk 18) for inputting the scramble-content corresponding to the PIP2 screen and a descrambling module that is not descrambling scramble-content (preferably, a descrambling module that can descramble the scramble-content to be displayed in the PIP2 screen), so that the scramble-content can be routed to the de- scrambling module.
  • the corresponding PIP2 processor outputs the descramble-content to the TV 30 so that the content can be displayed in the PIP2 screen.
  • a descrambling module that can descramble the scramble-content to be displayed in the PIP2 screen is descrambling another scramble-content, it is preferred that the router 52 do not establish the loop between the input means and the descrambling module but bypass the formation of the loop and wait for completion of the content de- scrambling operation in the descrambling module.
  • the router 52 receives scramble-content from the three sources
  • the first tuner 13, the second tuner 14 and the hard disk 18 receives descramble- content from the two descrambling modules (the first descrambling module 50 and the second descrambling module 51), and outputs the descramble-content to the two PIP processors (the PIPl processor 53a and the PIP2 processor 53b). If an interrupt processing method is performed, i.e., the PIP processor generates a signal for requesting to descramble specific content, the router 52 routes scramble-content input from a corresponding source to a corresponding descrambling module that is not performing a content descrambling operation, and then routes descramble-content de- scrambled by the descrambling module to a corresponding PIP processor.
  • the router 52 comprises a serial transport stream processor, and an
  • the serial transport stream processor converts data in a serial communication format into data in a parallel communication format (serial ⁇ parallel), or data in the parallel communication format into data in the serial communication format (parallel ⁇ serial).
  • the IEEE1284 signal processor converts data in an IEEE 1284 communication format into parallel data in an MPEG2-transport stream data communication format that is defined in digital video broadcasting standards.
  • each of the first descrambling module 50 and the second descrambling module 51 is a PCMCIA-type device used to descramble scrambled content.
  • Each of the descrambling module descrambles scramble-content received from one of the input means (the first tuner 13, the second tuner 14, or the hard disk 18).
  • the descrambling module is inserted into a CI slot of the digital set-top box.
  • Each of the PIPl processor 53a and the PIP2 processor 53b of the demultiplexer 53 performs the function of outputting the descramble-content routed by the router 52 to the PIPl or PIP2 screen of the TV 30, preferably, the function of causing the content to be decoded by the MPEG decoder 16 and to be displayed on the corresponding PIP screen.
  • FIG. 3 is a flowchart illustrating a multiple content descrambling method according to an embodiment of the present invention.
  • the PIPl processor 53a or the PIPl screen on the TV 30 is activated (300).
  • the respective descrambling modules are checked to select a descrambling module that can descramble scramble-content corresponding to the PIPl screen (301). At this time, this process is not to finally determine a descrambling module that can descramble scramble-content corresponding to the PIPl screen but to make a selection in advance as to which descrambling module can descramble scramble-content corresponding to the PIPl screen.
  • a change in packetizing between a header of scramble-content input into a descrambling module and a header of descramble-content output from the descrambling module e.g., a change in bit (" 1" ⁇ "0"
  • a descrambling module that is descrambling the scramble-content corresponding to the PIPl screen is identified (recognized) to be the first descrambling module 50 (302).
  • a de- scrambling module that is descrambling the scramble-content corresponding to the PIPl screen is the first descrambling module 50.
  • the router 52 forms a loop between the first descrambling module 50 and any one input means of the first tuner 13 that frequency-tunes the scramble-content corresponding to the PIPl screen, the second tuner 14 that frequency-tunes the scramble-content corresponding to the PIPl screen, and the hard disk 18 storing the scramble-content corresponding to the PIPl screen therein.
  • the content descrambled by the first descrambling module 50 is displayed in the PIPl screen on the TV 30 through the PIPl processor 53a.
  • the respective descrambling modules are checked to select a descrambling module that can descramble scramble-content corresponding to the PIP2 screen (304). Even at this time, this process is not to finally determine a descrambling module that can descramble scramble-content corresponding to the PIP2 screen but to make a selection in advance as to which descrambling module can descramble scramble-content corresponding to the PIP2 screen.
  • the descrambling module selected in step "304" is checked (305). If the descrambling module selected in step “304" among descrambling modules except the descrambling module identified in step “302" that is descrambling the scramble- content, i.e., among descrambling modules that are not descrambling the scramble- content, is the second descrambling module 51, a loop is formed among the second de- scrambling module 51, the pip2 processor 53b, and any one input means of the first tuner 13 that frequency-tunes the scramble-content corresponding to the PIP2 screen, the second tuner 14 that frequency-tunes the scramble-content corresponding to the PIP2 screen, and the hard disk 18 storing the scramble-content corresponding to the PIP2 screen therein (306). Then, the content descrambled by the second descrambling module 51 is displayed in the PIP2 screen on the TV 30 through the PIP2 processor 53b.
  • step "304" if there is no descrambling module except the descrambling module that is descrambling the scramble-content, that is, there is no descrambling module that is not descrambling the scramble-content, or if the descrambling module selected in step "304" dose not exist among descrambling modules except the descrambling module identified in step "302" that is descrambling the scramble-content, i.e., among descrambling modules that are not descrambling the scramble-content, a loop is not formed between the corresponding input means and the descrambling module but the formation of the loop is bypassed and completion of the content descrambling operation in the descrambling module is waited (307).

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

The present invention relates to a digital broadcasting conditional access device and a method for the same for descrambling a scrambled content, and more particularly, to a technique of routing multiple of content provided by multiple of input modules (e.g., tuner, hard disk, etc.) to descrambling modules that are not performing content descrambling respectively in order to be descrambled, upon identifying descrambling modules which are performing content de-scrambling based on header information in a descrambled content. According to the present invention, it is advantageous in that it is possible to perform the simultaneous real-time de-scrambling of multiple of paid broadcasting content provided by multiple of input modules (e.g., tuner, hard disk, etc.) or stored in a hard disk, etc., and thus, through a PIP function a user may accomplish a real-time content reproduction and view or record a live content on channels in a simultaneous manner.

Description

Description
DIGITAL BROADCASTING CONDITIONAL ACCESS DEVICE HAVING MULTIPLE CONTENTS DESCRAMBLING, AND
METHOD FOR THE SAME
Technical Field
[1] The present invention relates to a digital broadcasting conditional access device and a method for the same for descrambling a scrambled content, and more particularly, to a technique of routing multiple of content provided by multiple of input modules (e.g., tuner, hard disk, etc.) to descrambling modules that are not performing content de- scrambling respectively in order to be descrambled, upon identifying descrambling modules which are performing content descrambling based on header information in a descrambled content.
[2]
Background Art
[3] With the recent development of digital broadcasting (e.g., DVB) technology, a user can receive, view and record a digital video broadcasting program through a satellite, a territorial line, or a cable using a digital set-top box (STB), etc.
[4] In general paid broadcasting services, a content is transmitted via a satellite etc. upon being inserted a scramble data in order to prevent any viewing by non- subscribers. Therefore, a set-top box having a digital broadcasting conditional access device (e.g., DVB-CI) descrambles and outputs a scrambled data.
[5] By subscribers needs (e.g., simultaneous viewing of two broadcasting programs, recording one broadcasting program with viewing other broadcasting program), a picture-in-picture (PIP) function (so called "a screen division") is provided to a set-top box, so that through multiple of screens a user is able to view a broadcasting program while recording a specific broadcasting program.
[6] However, the conventional set-top box has a problem in that it cannot perform simultaneous real-time descrambling of multiple paid broadcasting content provided by multiple of input modules (e.g., tuner, hard disk, etc.) or scrambled content stored in a hard disk, etc. That is, the conventional digital conditional access device cannot perform real-time analysis for a descrambling operation, resulting in a direct configuration of one input module and one descrambling module. Thus, there is a problem in that multiple scrambled content provided by multiple of input modules cannot be simultaneously descrambled in real time.
[7]
Disclosure of Invention Technical Problem
[8] The present invention is conceived to solve the aforementioned problems and to meet the needs. Accordingly, an object of the present invention is to provide a technique of routing multiple of content provided by multiple of input modules (e.g., tuner, hard disk, etc.) to descrambling modules that are not performing content de- scrambling respectively in order to be descrambled, upon identifying descrambling modules which are performing content descrambling based on header information in a descrambled content.
[9]
Advantageous Effects
[10] According to the present invention, it is advantageous in that it is possible to perform the simultaneous real-time descrambling of multiple of paid broadcasting content provided by multiple of input modules (e.g., tuner, hard disk, etc.) or stored in a hard disk, etc., and thus, through a PIP function a user may accomplish a real-time content reproduction and view or record a live content on channels in a simultaneous manner.
[H]
Brief Description of the Drawings
[12] Fig. 1 is a block diagram of an embodiment of a digital set- top box to which the present invention is applied.
[13] Fig. 2 is a block diagram of the configuration of a multiple content descrambling module according to an embodiment of the present invention.
[14] Fig. 3 is a flowchart illustrating a multiple content descrambling method according to an embodiment of the present invention.
[15]
[16] <Explanation of reference numerals for designating main portions in the drawings>
[17] 13: First tuner 14: Second tuner
[18] 18: Hard disk 50: First descrambling module
[19] 51: Second descrambling module 52: Router
[20] 53a: PIPl processor 53b: PIP2 processor
[21]
Best Mode for Carrying Out the Invention
[22] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In this description, details on well-known functions or constitutions relevant to the present invention will be omitted if they would make the gist of the invention unnecessarily obscure. The terms used in the description are defined considering the functions of the present invention and may vary depending on the intention or usual practice of a user or operator. Therefore, the definitions should be made based on the entire contents of the description.
[23] Fig. 1 is a block diagram of an embodiment of a digital set-top box to which the present invention is applied. Hereinafter, an encrypted content is referred to as "a scramble-content", and a descrambled content is referred to as "a descramble-content."
[24] As shown in Fig. 1, the digital set-top box to which the present invention is applied includes a 1 -channel digital video recorder (ICH DVR) (called "1 -channel digital home security recorder") which comprises a video A/D converter 10 for converting an analog video signal from a television (TV) or a camera device into a digital video signal; an MPEG encoder 11 for encoding the digital video signal from the video A/D converter 10 into MPEG data format; and an Ethernet card (LAN Card) 12 charging of the Internet connection of the digital set-top box.
[25] The digital set-top box further includes a dual digital broadcasting recorder
(personal video recorder; PVR) which comprises a first and a second tuners 13 and 14 for respectively frequency-tuning digital video broadcasting signals received on different channels via an antenna; a digital video broadcasting conditional access device (e.g., DVB-CI) 15 for descrambling a scramble-content which frequency-tuned by the first or the second tuners 13 and 14 or stored in a hard disk 18; an MPEG decoder 16 for decoding the content of MPEG transport stream (MPEG-TS) format which descrambled by the digital video broadcasting conditional access device 15; a hard disk connection interface (ATAPI) 17; the hard disk 18; a video output 19; and an audio output 20.
[26] The digital set-top box further includes basic components for a digital broadcasting conditional access function and digital broadcasting receiving, recording, or outputting functions.
[27] With the digital set-top box, a user may encode a captured image by a camera into an MPEG format moving picture and transmit the moving picture to a computer which connected to an Internet, or may view on a television a digital video broadcasting program which received via antenna.
[28] Fig. 2 is a block diagram of the configuration of a multiple content descrambling module according to an embodiment of the present invention. Although the digital video broadcasting conditional access device 15 will be described below by way of example as having two descrambling modules, it will be understood by those skilled in the art that the digital video broadcasting conditional access device 15 may comprise multiple of descrambling modules and multiple of PIP processors, and multiple of PIP screens may be implemented on a TV.
[29] As shown in Fig. 2, the multiple content descrambling module according to the present invention comprises a first descrambling module (CAMl) 50, a second de- scrambling module (CAM2) 51, a router 52, and a demultiplexer 53. The demultiplexer 53 includes a first screen processor (hereinafter, referred to as "PIPl processor") 53a and a second screen processor (hereinafter, referred to as "PIP2 processor") 53b.
[30] Meanwhile, as described above with reference to Fig. 1, each of the first and second tuners 13 and 14 performs frequency tuning of paid digital video broadcasting signals, i.e., scramble-content on different channels received from a satellite, etc., the hard disk 18 stores the scramble-content, and different content is simultaneously displayed in PIPl and PIP2 screens in real time using a picture-in-picture function of a television (TV) 30.
[31] The router 52 identifies a descrambling module, which is performing a content de- scrambling operation, based on header information of the content descrambled by the first descrambling module 50 or the second descrambling module 51. In this state, the router 52 routes the scramble-content, which is input from the first tuner 13, the second tuner 14 or the hard disk 18, to a descrambling module that is not performing a content descrambling operation, so that the scramble-content can be descrambled by the de- scrambling module and then routed to a corresponding PIP processor. The PIP processor outputs the descramble-content to the TV 30 so that the content can be displayed in a corresponding PIP screen.
[32] Particularly, the router 52 checks a change in the content header before and after the content is descrambled by the descrambling module, i.e., a change in packetizing between a header of scramble-content input into the descrambling module and a header of descramble-content output from the descrambling module (e.g., a change in bit (" 1" →"0") to identify the descrambling module that is actually descrambling the scrambled content. Here, when the PIPl screen is activated in response to a user's request etc., i.e., when a user wants to view a specific paid broadcasting program in the PIPl screen, corresponding scramble-content is descrambled and displayed in the PIPl screen.
[33] When the router 52 has identified the descrambling module that is performing a content descrambling operation (i.e., a descrambling module that is not performing a content descrambling operation) as described above, and the PIP2 screen is activated in response to a user's request etc. (when a user wants to view or record another paid broadcasting program in the PIP2 screen), the router 52 selects (verifies) a de- scrambling module that can descramble scramble-content to be displayed in the PIP2 screen and then forms a loop between a means (the first tuner 13, the second tuner 14 or the hard disk 18) for inputting the scramble-content corresponding to the PIP2 screen and a descrambling module that is not descrambling scramble-content (preferably, a descrambling module that can descramble the scramble-content to be displayed in the PIP2 screen), so that the scramble-content can be routed to the de- scrambling module. Accordingly, the corresponding PIP2 processor outputs the descramble-content to the TV 30 so that the content can be displayed in the PIP2 screen.
[34] If a descrambling module that can descramble the scramble-content to be displayed in the PIP2 screen is descrambling another scramble-content, it is preferred that the router 52 do not establish the loop between the input means and the descrambling module but bypass the formation of the loop and wait for completion of the content de- scrambling operation in the descrambling module.
[35] As described above, the router 52 receives scramble-content from the three sources
(the first tuner 13, the second tuner 14 and the hard disk 18), receives descramble- content from the two descrambling modules (the first descrambling module 50 and the second descrambling module 51), and outputs the descramble-content to the two PIP processors (the PIPl processor 53a and the PIP2 processor 53b). If an interrupt processing method is performed, i.e., the PIP processor generates a signal for requesting to descramble specific content, the router 52 routes scramble-content input from a corresponding source to a corresponding descrambling module that is not performing a content descrambling operation, and then routes descramble-content de- scrambled by the descrambling module to a corresponding PIP processor.
[36] Preferably, the router 52 comprises a serial transport stream processor, and an
IEEE 1284 signal processor. The serial transport stream processor converts data in a serial communication format into data in a parallel communication format (serial → parallel), or data in the parallel communication format into data in the serial communication format (parallel → serial). The IEEE1284 signal processor converts data in an IEEE 1284 communication format into parallel data in an MPEG2-transport stream data communication format that is defined in digital video broadcasting standards.
[37] Meanwhile, each of the first descrambling module 50 and the second descrambling module 51 is a PCMCIA-type device used to descramble scrambled content. Each of the descrambling module descrambles scramble-content received from one of the input means (the first tuner 13, the second tuner 14, or the hard disk 18). The descrambling module is inserted into a CI slot of the digital set-top box.
[38] Each of the PIPl processor 53a and the PIP2 processor 53b of the demultiplexer 53 performs the function of outputting the descramble-content routed by the router 52 to the PIPl or PIP2 screen of the TV 30, preferably, the function of causing the content to be decoded by the MPEG decoder 16 and to be displayed on the corresponding PIP screen.
[39] Fig. 3 is a flowchart illustrating a multiple content descrambling method according to an embodiment of the present invention. [40] First, the PIPl processor 53a or the PIPl screen on the TV 30 is activated (300).
[41] The respective descrambling modules are checked to select a descrambling module that can descramble scramble-content corresponding to the PIPl screen (301). At this time, this process is not to finally determine a descrambling module that can descramble scramble-content corresponding to the PIPl screen but to make a selection in advance as to which descrambling module can descramble scramble-content corresponding to the PIPl screen.
[42] Then, a change in packetizing between a header of scramble-content input into a descrambling module and a header of descramble-content output from the descrambling module (e.g., a change in bit (" 1" → "0") is checked (analyzed), and a descrambling module that is descrambling the scramble-content corresponding to the PIPl screen is identified (recognized) to be the first descrambling module 50 (302). At this time, it can be seen from the analysis of the header information by the router 52 that a de- scrambling module that is descrambling the scramble-content corresponding to the PIPl screen is the first descrambling module 50. Thereafter, the router 52 forms a loop between the first descrambling module 50 and any one input means of the first tuner 13 that frequency-tunes the scramble-content corresponding to the PIPl screen, the second tuner 14 that frequency-tunes the scramble-content corresponding to the PIPl screen, and the hard disk 18 storing the scramble-content corresponding to the PIPl screen therein. The content descrambled by the first descrambling module 50 is displayed in the PIPl screen on the TV 30 through the PIPl processor 53a.
[43] The PIP2 processor 53b or the PIP2 screen on the TV 30 is then activated (303).
[44] The respective descrambling modules are checked to select a descrambling module that can descramble scramble-content corresponding to the PIP2 screen (304). Even at this time, this process is not to finally determine a descrambling module that can descramble scramble-content corresponding to the PIP2 screen but to make a selection in advance as to which descrambling module can descramble scramble-content corresponding to the PIP2 screen.
[45] Thereafter, the descrambling module selected in step "304" is checked (305). If the descrambling module selected in step "304" among descrambling modules except the descrambling module identified in step "302" that is descrambling the scramble- content, i.e., among descrambling modules that are not descrambling the scramble- content, is the second descrambling module 51, a loop is formed among the second de- scrambling module 51, the pip2 processor 53b, and any one input means of the first tuner 13 that frequency-tunes the scramble-content corresponding to the PIP2 screen, the second tuner 14 that frequency-tunes the scramble-content corresponding to the PIP2 screen, and the hard disk 18 storing the scramble-content corresponding to the PIP2 screen therein (306). Then, the content descrambled by the second descrambling module 51 is displayed in the PIP2 screen on the TV 30 through the PIP2 processor 53b.
[46] On the other hand, as a result of the check of the descrambling module selected in step "304" (305), if there is no descrambling module except the descrambling module that is descrambling the scramble-content, that is, there is no descrambling module that is not descrambling the scramble-content, or if the descrambling module selected in step "304" dose not exist among descrambling modules except the descrambling module identified in step "302" that is descrambling the scramble-content, i.e., among descrambling modules that are not descrambling the scramble-content, a loop is not formed between the corresponding input means and the descrambling module but the formation of the loop is bypassed and completion of the content descrambling operation in the descrambling module is waited (307).
[47] According to the present invention described above, it is possible to make quick and accurate real-time analysis and determination as to which descrambling module will be used to descramble which scramble-content, by using a hardware router and software installed in the router, and to analyze content with a stream size of 24 to 40 Mbps using system software.
[48] According to the present invention, it is also possible to route two content upon input/output thereof and to perform a content header analyzing process, which was performed by a demultiplexer in the prior art, in a more precise and rapid interrupt processing manner, so that this process can be actually implemented in a digital broadcasting conditional access device.
[49] Although the present invention has been illustrated and described in connection with the preferred embodiments, the embodiments are only for illustrative purposes and should not be construed as limiting the scope of the present invention. It will be readily understood by those skilled in the art that various modifications and changes can be made thereto without departing from the spirit and scope of the present invent ion defined by the appended claims.

Claims

Claims
[1] A digital broadcasting conditional access device having multiple content de- scrambling, which comprising: a plurality of input units for respectively receiving a scramble-content; a plurality of descramblers for respectively descrambling the scramble-content; a plurality of screen processors for respectively displaying descramble-content in corresponding screens; and a router for identifying a descrambler which is performing content descrambling operation by analyzing a header of the descramble-content, selecting a specific descrambler out of said descrambler(s) which are identified not to perform content descrambling operation, when a specific picture-in-picture (PIP) screen is activated, for descrambling the content which corresponding to said activated PIP screen, and establishing a loop among the specific input unit receiving the scramble-content for said activated PIP screen, the selected specific descrambler, and the specific screen processor causing the descramble-content displayed in said PIP screen.
[2] The device as claimed in claim 1, wherein said router checks a change in packetizing between a header of the scramble-content and a header of the descramble-content so as to identify a descrambler which is performing content descrambling operation.
[3] The device as claimed in claim 1 or 2, wherein said router establishes the loop responding to a request for interrupt processing from a specific screen processor.
[4] A method of descrambling multiple content in a digital broadcasting conditional access device, the method comprising: a first step of identifying a descrambler which is performing content de- scrambling operation by analyzing descramble-content outputted from a plurality of descramblers; a second step of, when a specific PIP screen is activated, selecting a specific de- scrambler for descrambling content to be displayed in said activated PIP screen; and a third step of, if said specific descrambler selected in the second step exists among the descramblers identified in the first step not to perform content scrambling operation, establishing a loop among a specific input unit receiving the scramble-content for said activated PIP screen, the selected specific de- scrambler, and the specific screen processor causing the descramble-content displayed in the PIP screen.
[5] The method as claimed in claim 4, wherein the first step checks a change in packetizing between a header of the scramble-content and a header of the descramble-content so as to identify whether being performing content de- scrambling operation.
PCT/KR2005/003339 2004-10-11 2005-10-07 Digital broadcasting conditional access device having multiple contents descrambling, and method for the same WO2006080724A1 (en)

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KR1020050004530A KR100713558B1 (en) 2004-10-11 2005-01-18 DVB-CI device for descrambling multiple contents and method for the same

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