CN100471258C - Descramble method for digital television condition receiving general interface and its device - Google Patents
Descramble method for digital television condition receiving general interface and its device Download PDFInfo
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- CN100471258C CN100471258C CNB2005100117251A CN200510011725A CN100471258C CN 100471258 C CN100471258 C CN 100471258C CN B2005100117251 A CNB2005100117251 A CN B2005100117251A CN 200510011725 A CN200510011725 A CN 200510011725A CN 100471258 C CN100471258 C CN 100471258C
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Abstract
The invention relates to a descramble method of digital television condition receiving general interface, and relative device. Wherein, said device comprises a sound/video decoder, a micro processor, a general transmission flow interface, a general command interface, a general interface command controller, a general interface condition, an extending interface command controller for connecting the micro processor and the general interface command controller to build communication with them; an extending transmission flow interface containing input and output used to input scrambled transmission flow and output descrambled transmission flow; an extending command interface connecting the extending interface command controller; and an extending interface condition receiving descramble module for descrambling the scrambled transmission flow output from the extending transmission flow interface and via the extending transmission interface and extending command interface communicating with sound/video decoder and extending interface command controller. The invention can descramble multi paths of scrambled transmission flow synchronously.
Description
Technical field
The present invention relates to the descrambling of the scrambling transport stream that digital TV conditional receives, particularly relate to by what the digital television condition receiving general interface expansion technique was realized two-way or multichannel scrambling transport stream are carried out the method for descrambling simultaneously.
Background technology
In cable television system or satellite television broadcasting, normally digital TV program stream is adopted Conditional Access (the Conditional Access of scrambling, CA) mode is transmitted, the user can only watch and realize the paid service of digital television broadcasting system through the broadcast service or the program of authorizing.System operator is selected different CA systems usually, digital television receiver or set-top box manufacturer need carry out CA at the system that particular operator adopted and transplant, then the product of this built-in specific CA is sold or is configured in user's hand via operator, formed like this market is commonly referred to the closed market, because competition is insufficient, the receiver price is comparatively expensive, and the user can't select to buy different class according to individual's hobby, the product of different brands, Fig. 1 have provided the operational mode schematic diagram of digital television receiving apparatus under the condition of closed market.Digital television conditional receives (CA) universal interface standard (or being called digital television card separation criterion) and arises at the historic moment, what its defined is a kind of standard interface between main frame and module, the reception processing capacity that CA is relevant is placed in the module, and main frame only need be handled descrambling or transparent program stream, Fig. 2 has provided the schematic diagram that the general-purpose interface main frame is connected with the single module signal, and the form of main frame can be digital TV integrated machine, set-top box (Integrated Receive Decoder), PC card-receiving device, dvd playback such as DVD, HD DVD are recorded or composite set etc.Digital television receiver (or set-top box) product based on condition receiving general interface (or being called separation between machine and card) standard, can form opening the markets truly, by large-scale production and sale, allow the ultimate consumer obtain more to select right, embodied digital TV terminal product development in future direction, HOST-POD condition receiving general interface standard has been decided to be enforceable standard as U.S. FCC.
Existing universal interface standard comprises:
DVB-CI (Common Interface) condition receiving general interface standard (EN-50221) is adopted in Europe, and physical layer interface is based on the pcmcia interface agreement, and the number of modules of support is: 1-16.
Host-POD (Point Of Deployment) interface standard (ANSI/SCTE 28 2004) is adopted in the North America, and physical layer interface is based on the pcmcia interface agreement, and the number of modules of support is: 1.
China exists 2 kinds of solutions or standard (being called the separation between machine and card standard), and one is to be equal to adopt European DVB-CI condition reception PCMCIA universal interface standard (EN-50221), and another physical layer is based on usb protocol.
To the operation principle of these standard interfaces be briefly described below:
All these interfaces all possess 2 components, i.e. transport stream (TS) interface and command interface.For the ease of realizing that 2 kinds of interface protocols all adopt hierarchy to be described.Wherein transport stream (TS) interface can be finished the two-way transmission of MPEG2 transmission package between main frame and module.If support the condition of multimode work, the structure of transport stream (TS) presents daisy chain structure, as shown in Figure 3.Command interface is responsible for the communication between module and the main frame, and function comprises: support same host process single module or multimode ability, support session between main frame and the module, support target expansion, the hierarchical structure of each layering of command interface is as shown in table 1 below:
" specific " in the table 1 refers to physical layer interfaces such as PCMCIA, USB, IEEE1394, and the specific implementation characteristic of specific transmission sublayer depends on coded system, message exchange protocol, and the general transmission sublayer has defined the sign that is connected with transport layer, initial and termination; Session layer, resource layer, application layer are identical to all physics realizations.
Existing digital television condition receiving general interface standard can only be carried out descrambling to the transport stream (TS) of one tunnel scrambling, under the situation of program of digital TV system scrambling, can't realize the above scrambling transport stream of two-way (TS) is carried out descrambling simultaneously, general-purpose interface is only supported the descrambling to one tunnel transport stream (TS), so can not realize or be supported in the following function that main frame is realized:
1, receives in the transmission system (wired, satellite, microwave, system such as wireless) demonstration when realizing to arbitrary channel or professional two pictures or many pictures in same or different condition;
2, in same transmission system, do not influence watch current program in, contain the transport stream of electronic program guide information (EPG) by the search of other tuner, immediately obtain and upgrade electronic program guide information, make things convenient for user's choosing to program;
3, receive in the transmission system (wired, satellite, microwave, wireless etc. system) in same or different condition, when watching a channel or business program, but record other channel or business program in record device (as PVR etc.) arbitrarily.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of de-scrambling method and device thereof that is used for digital television condition receiving general interface, be used to solve under the situation of program of digital TV system scrambling, can't realize two-way or multichannel scrambling transport stream are carried out simultaneously the problem of descrambling.
To achieve these goals, the invention provides a kind of descrambler that is used for digital television condition receiving general interface, be used for two-way or multichannel scrambling transport stream are carried out descrambling simultaneously, comprise: audio/video decoder, microprocessor, general transmission stream interface, generic command interface, general-purpose interface instruction control unit, general-purpose interface condition receive descrambling module; Described general-purpose interface condition receives descrambling module and receives the scrambling transport stream and transmit the descrambling transport stream to described audio/video decoder by the general transmission stream interface; Described general-purpose interface instruction control unit connects described microprocessor, and connects general-purpose interface condition reception descrambling module by described generic command interface, it is characterized in that this device also comprises:
One expansion interface instruction control unit connects described microprocessor, general-purpose interface instruction control unit, is used for setting up communication with described microprocessor, general-purpose interface instruction control unit;
One expansion transport stream interface comprises input, output, is respectively applied for input scrambling transport stream, output descrambling transport stream;
One explosion command interface connects described expansion interface instruction control unit;
One expansion interface condition receives descrambling module, be used for the scrambling transport stream of described expansion transport stream interface output is carried out descrambling, and carry out communication with described audio/video decoder, expansion interface instruction control unit respectively by described expansion transport stream interface, explosion command interface;
Described microprocessor is distinguished described generic command interface and described explosion command interface in the access control of docking port.
The described descrambler that is used for digital television condition receiving general interface wherein, also comprises a logging modle, connects described expansion transport stream interface, is used to realize record, playback, editor's controlled function of transport stream.
The described descrambler that is used for digital television condition receiving general interface, wherein, described expansion interface instruction control unit adopts and the identical control circuit of described general-purpose interface instruction control unit.
The described descrambler that is used for digital television condition receiving general interface, wherein, described general transmission stream interface/generic command interface/expansion transport stream interface/explosion command interface adopts parallel interface mode or serial interface mode.
The described descrambler that is used for digital television condition receiving general interface, wherein, described expansion interface condition receives descrambling module and adopts described general-purpose interface condition to receive descrambling module.
To achieve these goals, the present invention also provides a kind of de-scrambling method that is used for digital television condition receiving general interface that is applicable to described device, be used for two-way or multichannel scrambling transport stream are carried out descrambling simultaneously, it is characterized in that the scrambling transport stream of sending to described expansion transport stream interface receives the descrambling module descrambling through described expansion interface condition and carries out decoding processing after described expansion transport stream interface is delivered to described audio/video decoder; To send to described expansion interface instruction control unit by described explosion command interface through the transport stream of described expansion interface condition reception descrambling module scramble process handles; Described expansion interface instruction control unit is handled to handle with described microprocessor, general-purpose interface instruction control unit respectively and is set up communication.
The described de-scrambling method that is used for digital television condition receiving general interface wherein, also comprises the step of a record transport stream, is used for writing down, resets, edits described transport stream.
The described de-scrambling method that is used for digital television condition receiving general interface wherein, comprises that also one shows the step of two pictures or many pictures simultaneously in described Digital Television, and this step further comprises:
Step 81, scrambling transport stream are connected to the output of expansion transport stream interface, enter the input that corresponding expansion interface condition receives the expansion transport stream interface of descrambling module;
Step 82, described expansion interface condition receive descrambling module described scrambling transport stream are carried out scramble process;
Step 83 outputs to the input of described expansion transport stream interface with the transport stream behind the descrambling, is input to the corresponding end of described audio/video decoder again, finishes decoding by two passages or multichannel transport stream and audio/video decoder; And
Step 84 shows that via two pictures or many pictures treatment circuit outputs to display screen with final shows signal.
The described de-scrambling method that is used for digital television condition receiving general interface, wherein, described general transmission stream interface/generic command interface/expansion transport stream interface/explosion command interface is with parallel interface mode or serial interface mode work.
The described de-scrambling method that is used for digital television condition receiving general interface, wherein, described expansion interface instruction control unit adopts and the identical control circuit of described general-purpose interface instruction control unit.
The method of the digital television condition receiving general interface expansion technique that proposes by the present invention, therefore can realize two-way or multichannel scrambling transport stream are carried out descrambling simultaneously, can in digital television receiver (main frame), further realize function: realize demonstration in two pictures of arbitrary channel or business or the many pictures; In time obtain and upgrade electronic program guide information (EPG), make things convenient for user's choosing program; Can be when watching a channel or business program, but other channel or business program can be write down arbitrarily in record device (as PVR).
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the operational mode schematic diagram of digital television receiving apparatus under the condition of closed market;
Fig. 2 is the schematic diagram that the general-purpose interface main frame is connected with the single module signal;
Fig. 3 is the transport stream structure schematic diagram under the multimode condition of work;
Fig. 4 handles for digital television condition receiving general interface standard transmission stream interface and only supports one tunnel scrambling transport stream to carry out the descrambling schematic diagram; And
Fig. 5 is that digital television condition receiving general interface standard transmission stream interface is handled the general-purpose interface expansion schematic diagram of supporting two-way or multichannel scrambling transport stream while descrambling.
Embodiment
Fig. 4 handles for digital television condition receiving general interface standard transmission stream interface and only supports one tunnel scrambling transport stream to carry out the descrambling schematic diagram, the operation principle of transport stream (TS) interface in the digital TV conditional reception general standard interface only supports to come from one tunnel transport stream (TS) of a physical channel in the transmission system, as shown in Figure 4, condition receives general standard interface can only support scrambling transport stream TS 1, then can't implement descrambling to transport stream TS 2; Maybe can only finish descrambling, then can't implement descrambling transport stream TS 1 to TS2.
The present invention realizes two-way or multichannel scrambling transport stream are carried out descrambling simultaneously by the digital television condition receiving general interface expansion technique, hereinafter, and " universal interface standard " expression " digital television condition receiving general interface standard "; " be suitable for universal interface standard " expression is specifically in a certain zone or institute of the country digital television condition receiving general interface standard that was suitable for or used.
Fig. 5 is for supporting two-way or multichannel scrambling transport stream (TS) the general-purpose interface expansion schematic diagram of descrambling simultaneously; Wherein, the right half part of this schematic diagram belongs to universal interface standard groundwork flow process and partly illustrates, as shown in Figure 5, wherein general-purpose interface condition reception descrambling module is two, promptly, the general-purpose interface condition receives descrambling module # 1 13, the general-purpose interface condition receives descrambling module # 2 23, the general-purpose interface condition receives descrambling module # 1 13 and receives the scrambling transport stream by general transmission stream interface 130, and transport stream behind the descrambling is sent to general transmission stream interface 230, general-purpose interface instruction control unit # 1 12 by general transmission stream interface 130, generic command interface 131 respectively; The general-purpose interface condition receives descrambling module # 2 23 and by general transmission stream interface 230, generic command interface 231 transport stream behind the descrambling is sent to two passages or multichannel transport stream and A/V decoder 15, general-purpose interface instruction control unit # 1 12 respectively.According to relevant standard code, can only support one, or 12 is general-purpose interface instruction control unit # 1 to a plurality of modules to support one, this controller is the chief component of command interface control circuit.The expansion interface method and technology contents processing that two-way or the multichannel scrambling transport stream (TS) based on general-purpose interface that the present invention shown in Figure 5 increases carried out descrambling simultaneously specifically describes as follows:
One, expansion interface structure
A1, condition receive the descrambling expansion interface and are made up of expansion transport stream interface 2 and explosion command interface 3 (by last table 1 command interface hierarchical description), its physical layer characteristic, include but not limited to that main frame 9 is connected with electrical characteristics with machinery between the module, jack type and size, pin definitions and number of pins, voltage, impedance, Power Limitation and requirement etc., can be consistent with the physical layer characteristic of the universal interface standard defined that is suitable for;
The agreement of A2, expansion transport stream interface 2 link layer characteristics and explosion command interface 3 link layers and specific transmission sublayer can be consistent with the universal interface standard respective layer agreement that is suitable for;
General transmission sublayer, session layer, resource layer and application layer protocol in A3, the explosion command interface 3 is identical with the universal interface standard respective layer agreement that is suitable for;
The expansion interface condition of A4, expansion interface correspondence receives descrambling module # 1 1 can have identical characteristic, function and structure with general-purpose interface condition reception descrambling module #113 and general-purpose interface condition reception descrambling module # 2 23;
A5, expansion interface can support a plurality of conditions to receive descrambling module mode 11, are used for the descrambling function of realization to multichannel scrambling transport stream (TS);
Among A6, Fig. 5, being connected between general-purpose interface, expansion interface and main frame 9 and the module is logicality, and the interface of its physical layer is realized can be parallel interface mode or serial interface mode; Concrete interface mode includes but not limited to PCMCIA, USB, IEEE1394 etc.
Two, expansion transport stream interface operation principle
B1, RF2 be through tuner and digital demodulator part 101,102,103 output scrambling transport stream (TS2) 5, RF2 can be with RF1 from same digital television transmission system, also can be from different digital television transmission systems; Tuner and digital demodulator part the 101,102, the 103rd are with the corresponding receiving device of RF digital television transmission system; TS2 also can directly receive main frame 200 outside inputs from Digital Television;
B2, scrambling transport stream (TS2) 5 are connected to the output of expansion transport stream interface 2, enter the input that corresponding expansion interface condition receives descrambling module # 1 1 transport stream interface; The expansion interface condition outputs to the input of expanding transport stream interface 2 after receiving descrambling module 1 pair of scrambling transport stream of #1 (TS2) 5 descramblings again, be input to the transport stream of main frame 9 and A/V decoder Ch2 end then, finish decoding work by two passages or multichannel transport stream and A/V decoder 15;
B3 also shows that via two pictures (picture-in-picture, picture out picture, divided frame etc.) or many pictures treatment circuit outputs to display screen 14 with final shows signal;
If B4 main frame 9 record support devices 16 (by hard disk, CD or other storage mediums) can be connected to the transport stream of descrambling (TS2) 8 in the tape deck 16, record, playback and the edition function realized transport stream (TS2) 8 by tape deck 16;
B5, expansion interface receive descrambling module mode 11 times in a plurality of conditions, daisy chain structure under the transport stream working method (TS) of its transport stream interface working method and universal interface standard is different, the transport stream output and the input channel of each module correspondence all are independently, referring to shown in Figure 5.
Three, explosion command interface operation principle
C1, identical with universal interface standard command interface operation principle, the communication that explosion command interface 3 is responsible between module and the main frame, the address bus of main frame (CPU) 9, data/address bus and control signal 7, according to the physical layer specification requirement of the universal interface standard defined that is suitable for, be connected to the corresponding tie point of command interface after handling directly or by expansion interface instruction control unit # 2 4;
C2, expansion interface instruction control unit # 2 4 can adopt the control circuit (IC) identical with general-purpose interface instruction control unit # 1 12, also can adopt other control circuit (IC);
The interruption of C3, expansion interface instruction control unit # 2 4 or request signal line can be connected 6 with general-purpose interface command interface controller # 1 12, so that main frame (CPU) 9 can be managed relevant resource concentratedly, also can realize resources centralized management by the form that is connected to other relevant control device;
The physical layer of C4, explosion command interface 3, link layer, specific transmission sublayer can be finished by the specific driver that operates in main frame 9 ends, as identical with the universal interface standard that is suitable for, then directly use the corresponding Drive Layer program of main frame 9 generic command interfaces;
C5, be responsible for finishing the specific implementation of general transmission sublayer, session layer, resource layer and application layer protocol in the explosion command interface 3 at the universal interface standard software protocol stack of main frame 9 ends operations;
C6, in the access control of main frame 9 end software docking ports, need distinguish general standard interface and expansion interface, this can increase in universal interface standard software protocol stack and set up the expansion interface application or the proprietary protocol mode is finished;
C7, explosion command interface 3 operating softwares are supported the multimode working method.
Effect of the present invention:
The present invention can realize two-way or multichannel scrambling transport stream are carried out descrambling simultaneously by the digital television condition receiving general interface expansion technique, thereby can further realize following function in digital television receiver (main frame):
Receive in the transmission system (wired, satellite, microwave, system such as wireless) demonstration when realizing to arbitrary channel or professional two pictures or many pictures in same or different condition;
In same transmission system, do not influence watch current program in, contain the transport stream of electronic program guide information (EPG) by the search of other tuner, immediately obtain and upgrade electronic program guide information, make things convenient for user's choosing to program;
Receive in the transmission system (wired, satellite, microwave, system such as wireless) in same or different condition, when watching a channel or business program, but can write down arbitrarily other channel or business program in record device (as PVR etc.).
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1, a kind of descrambler that is used for digital television condition receiving general interface comprises that audio/video decoder, microprocessor, general transmission stream interface, generic command interface, general-purpose interface instruction control unit, general-purpose interface condition receive descrambling module; Described general-purpose interface condition receives descrambling module and receives the scrambling transport stream and transmit the descrambling transport stream to described audio/video decoder by the general transmission stream interface; Described general-purpose interface instruction control unit connects described microprocessor, and connects general-purpose interface condition reception descrambling module by described generic command interface, it is characterized in that this device also comprises:
One expansion interface instruction control unit connects described microprocessor, general-purpose interface instruction control unit, is used for setting up communication with described microprocessor, general-purpose interface instruction control unit;
One expansion transport stream interface comprises input, output, is respectively applied for input scrambling transport stream, output descrambling transport stream;
One explosion command interface connects described expansion interface instruction control unit;
One expansion interface condition receives descrambling module, be used for the scrambling transport stream of described expansion transport stream interface output is carried out descrambling, and carry out communication with described audio/video decoder, expansion interface instruction control unit respectively by described expansion transport stream interface, explosion command interface;
Described microprocessor is distinguished described generic command interface and described explosion command interface in the access control of docking port.
2, the descrambler that is used for digital television condition receiving general interface according to claim 1 is characterized in that, also comprises a logging modle, connects described expansion transport stream interface, is used to realize record, playback, editor's controlled function of transport stream.
3, the descrambler that is used for digital television condition receiving general interface according to claim 1 is characterized in that, described expansion interface instruction control unit adopts and the identical control circuit of described general-purpose interface instruction control unit.
4, the descrambler that is used for digital television condition receiving general interface according to claim 1, it is characterized in that described general transmission stream interface/generic command interface/expansion transport stream interface/explosion command interface adopts parallel interface mode or serial interface mode.
5, the descrambler that is used for digital television condition receiving general interface according to claim 1 is characterized in that, described expansion interface condition receives descrambling module and adopts described general-purpose interface condition to receive descrambling module.
6, a kind of de-scrambling method that is used for digital television condition receiving general interface that is applicable to the described device of claim 1, it is characterized in that the scrambling transport stream of sending to described expansion transport stream interface receives the descrambling module descrambling through described expansion interface condition and carries out decoding processing after described expansion transport stream interface is delivered to described audio/video decoder; To send to described expansion interface instruction control unit by described explosion command interface through the transport stream of described expansion interface condition reception descrambling module scramble process handles; Described expansion interface instruction control unit is handled to handle with described microprocessor, general-purpose interface instruction control unit respectively and is set up communication.
7, the de-scrambling method that is used for digital television condition receiving general interface according to claim 6 is characterized in that, also comprises the step of a record transport stream, is used for writing down, resets, edits described transport stream.
8, the de-scrambling method that is used for digital television condition receiving general interface according to claim 6 is characterized in that, comprises that also one shows the step of two pictures or many pictures simultaneously in described Digital Television, and this step further comprises:
Step 81, scrambling transport stream are connected to the output of expansion transport stream interface, enter the input that corresponding expansion interface condition receives the expansion transport stream interface of descrambling module;
Step 82, described expansion interface condition receive descrambling module described scrambling transport stream are carried out scramble process;
Step 83 outputs to the input of described expansion transport stream interface with the transport stream behind the descrambling, is input to the corresponding end of described audio/video decoder again, finishes decoding by two passages or multichannel transport stream and audio/video decoder; And
Step 84 shows that via two pictures or many pictures treatment circuit outputs to display screen with final shows signal.
9, the de-scrambling method that is used for digital television condition receiving general interface according to claim 6, it is characterized in that described general transmission stream interface/generic command interface/expansion transport stream interface/explosion command interface is with parallel interface mode or serial interface mode work.
10, the de-scrambling method that is used for digital television condition receiving general interface according to claim 6 is characterized in that, described expansion interface instruction control unit adopts and the identical control circuit of described general-purpose interface instruction control unit.
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Granted publication date: 20090318 Termination date: 20180516 |