CN1226879C - Telephone video requesting system and its method - Google Patents
Telephone video requesting system and its method Download PDFInfo
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- CN1226879C CN1226879C CNB031403298A CN03140329A CN1226879C CN 1226879 C CN1226879 C CN 1226879C CN B031403298 A CNB031403298 A CN B031403298A CN 03140329 A CN03140329 A CN 03140329A CN 1226879 C CN1226879 C CN 1226879C
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Abstract
The present invention discloses a telephone video requesting system and a requesting method thereof. The telephone video requesting system comprises a wired television digital set-top box, a PSTN network, an HFT network, a telephone video requesting server, a data broadcasting server and a video server, wherein the telephone video requesting server is connected with the data broadcasting server and the video server through interfaces and is connected with the PSTN network through a telephone line; the data broadcasting server and the video server transmit program information and video signals to the wired television digital set-top box of the user end through the HFC network. The requesting method comprises the steps that the telephone video requesting server utilizes the data broadcasting server to transmit the program information to the set top box through the HFC network; after a user browses the program information, the user makes a phone call to request the program; after the telephone video requesting server receives the call, the telephone video requesting server utilizes the video server to transmit the requested program to the set top box through the HFC network. On the basis that the cost is not increased, the present invention uses a one-way set top box to achieve video requests through the PSTN network and the HFC network.
Description
Technical field
The present invention relates to a kind of video on-demand system and order method thereof, relate in particular to a kind of phone video on-demand system and order method thereof based on Hybrid Fiber Coaxial (HFC), public phone network (PSTN) and cable television digital set-top box.
Background technology
At present, the user can pass through existing video on-demand system, uses the cable television digital set-top box (or claiming cable TV subscriber's terminal receiver) that satisfies the DVB-C standard, is used for receiving digital television to carry out Video-on-demand, and its system configuration as shown in Figure 1.The on-demand process of existing video on-demand system mainly is made of following several steps:
1, video frequency program navigation: the user is undertaken finding the video frequency program of wishing program request alternately by cable television digital set-top box and video on-demand system.In this course, cable television digital set-top box is all undertaken by return path to the information that video on-demand system sends, the information that video on-demand system sends to cable television digital set-top box can be by return path, also can be to pass through hfc plant.
2, play-on-demand program: find to carry out the program of program request after, cable television digital set-top box sends order request by return path to video on-demand system.
3, program broadcasts: after video on-demand system receives order request, by hfc plant the video frequency program of user's program request is sent to cable television digital set-top box, and receives the video frequency program that broadcasts by return path notice cable television digital set-top box.
4, program receives: cable television digital set-top box is decoded to the video frequency program that receives, and delivers on the television set with the form of A/V to show.
Fig. 1 shows that cable television digital set-top box is wanted to realize video on-demand function, a return path support must be arranged.With regard to present circumstances, utilizable return path comprises four big classes.The first kind is to utilize telephone wire, and this moment, return path was made up of public telephone network (PSTN), required the cable television digital set-top box internal modem, and relevant communications protocol is (as tcp/ip, ppp); Second class is to utilize the ADSL broadband network of telecommunication; The 3rd class is to be used in the broadband network that Ethernet is registered one's residence; The 4th class is to utilize two-way hfc plant.The extensive at present cable television digital set-top box of popularizing all is unidirectional terminal receiver, that is to say the cable television digital set-top box with return path, its major function is to watch Digital Television and some digital broadcasting services (as electronic program guides, securities information, information broadcast etc.).The one-way CATV top box of digital machine is wanted to utilize return path, realizes video on-demand function, just needs to increase relevant hardware and software.This can bring the problem of two aspects: the one, and the cost of increase cable television digital set-top box is unfavorable for popularizing of cable television digital set-top box; The 2nd, use the user of one-way CATV top box of digital machine can't enjoy this new service of video request program for a large amount of at present.
Summary of the invention
The object of the present invention is to provide and a kind ofly on the basis that does not increase cost, use the one-way CATV top box of digital machine, utilize PSTN network and hfc plant to carry out the phone video on-demand system and the order method thereof of program request.
Purpose of the present invention is achieved by the following technical programs:
A kind of phone video on-demand system provided by the invention comprises cable television digital set-top box, PSTN network and hfc plant, also comprises the server group of being made up of following equipment:
1) phone ordering server, promptly be used to generate can request program programme information, this server has at least one can receive sound card of user profile and order request by the PSTN network, and has the database of depositing programme information and user profile.According to practical situations, the sound card in the phone ordering server of the present invention can be one, also can be polylith, and the sound card of insertion can receive the telephone number of dialling in phone; The programme information of database comprises that but program names, program length, program classification, program request number, the request video server of request program carry out information and other supplementarys that program broadcasts needs in this server; User profile mainly comprises information such as intelligent card numbers that user's user name, telephone number, cable television digital set-top box are used and user place physical location.
2) broadcast data server promptly is used for monitoring and upgrading at the request program information that described phone ordering server sends, and through hfc plant programme information is sent to cable television digital set-top box by the DVB broadcast card.Cable television digital set-top box receives the programme information that broadcast data server sends, and the user can search the program of wishing program request easily.
3) video server, promptly be used to deposit video file and have one at least and broadcast card, the request program request that can send according to described phone ordering server, the broadcast card by appointment is sent to cable television digital set-top box through hfc plant with the video file of request program.Video server of the present invention is by its management system, and the video file of program is stored in the hard disk array of video server.It can be one that DVB in this server broadcasts card, it also can be polylith, next piece of normal conditions broadcasts corresponding one of card and broadcasts passage, video server will be gone up at the passage (broadcasting card) of appointment and through hfc plant program is sent to cable television digital set-top box and broadcasts after receiving the order request that the phone ordering server sends.
In the inside of described server group, the phone ordering server is connected with video server with broadcast data server by its communication interface.
The sound card of described server group by the phone ordering server is connected with the PSTN network through telephone wire, the broadcast card by broadcast data server and the broadcast card of video server through hfc plant with programme information and video signal transmission to the cable television digital set-top box of user side.
Phone ordering server of the present invention sends request by communication interface to broadcast data server, through hfc plant programme information is sent to cable television digital set-top box by the DVB broadcast card according to this request msg broadcasting server.The user browses programme information by cable television digital set-top box, finds the program of wanting program request, calls and carries out program request.The phone video server receives user's vod by telephone request by sound card, sends the playing programs request by communication interface to video server then, broadcasts card broadcasts user's program request through hfc plant program according to this request video server by DVB.
Phone video on-demand system provided by the invention can further include and is used for sending the conditional receiving device that broadcasts confirmation to cable television digital set-top box, this device will confirm to broadcast message transmission to the cable television digital set-top box of user side through hfc plant, and be connected with described server group through the communication interface of described phone ordering server.Phone ordering server of the present invention is after video server sends the playing programs request, also the request condition receiving system sends to cable television digital set-top box by hfc plant and broadcasts confirmation, is convenient to the program that cable television digital set-top box finds the program request of user institute.
Phone ordering server of the present invention is made of following module:
1) information typing module promptly is used for providing input interface realizing that the programme information and the user profile of database are carried out typing and editor, with the renewal of this fulfillment database and perfect.
2) programme information generation module promptly is used for taking out programme information and being sent to broadcast data server from database.Programme information generation module of the present invention can take out programme information from database, and converts the form formation file that defines to, by communication interface these program information file is sent on the broadcast data server.
3) phone receiving processing module promptly is used to receive vod by telephone, can send request to video server and conditional receiving device as requested.After receiving user's some telephone call screener, the sound card in the phone ordering server of the present invention can obtain the telephone number that the user dials in by the public telephone network incoming call display function.According to this telephone number, described phone receiving processing module can be searched corresponding user, determines the intelligent card numbers of cable television digital set-top box and user's physical location, and requires the user to import the program request number of required programs.According to program request number and user's physical location, on the passage of appointment, broadcast user's program by communication interface request video server through hfc plant; According to the intelligent card numbers of cable television digital set-top box, the request condition receiving system sends program through hfc plant to this cable television digital set-top box and broadcasts confirmation.
The broadcast jig of the broadcast card of broadcast data server of the present invention and video server has DVB data broadcast standard form.The communication interface of described phone ordering server is an Ethernet interface.
The order method of described phone video on-demand system provided by the invention may further comprise the steps:
A. utilize information typing module in the described phone ordering server with in programme information and the user profile input database, and edit as required;
B. utilize in the database of programme information generation module from step a in the phone ordering server and to take out programme information and be sent in the described broadcast data server by communication interface;
C. broadcast data server is sent to by broadcast card the programme information that receives user's cable television digital set-top box through hfc plant;
D. the user seeks the program of wishing program request according to the programme information that cable television digital set-top box receives, and the program request number of record required programs;
E. the user uses phone to dial, the phone ordering server utilizes the phone receiving processing module to handle, after at first the caller identification of sound card by public telephone network receives the telephone number of dialling in phone, from the user profile of typing in advance, search corresponding user and carry out identity validation; Behind the identity validation, import the program request number of required programs by the voice suggestion user; In conjunction with the physical location of program request number, send playing request to described video server by communication interface with the relative users that finds;
F. video server is sent to cable television digital set-top box through hfc plant with the program of program request number correspondence according to the playing request that the receives broadcast card by appointment; Cable television digital set-top box is delivered on the television set after the program that receives is decoded, and the user then can watch the program of program request.
The order method of described phone video on-demand system provided by the invention can also may further comprise the steps: the phone ordering server sends playing request by communication interface to video server, after receiving the information that video server returns success, the phone ordering server sends request by communication interface to conditional receiving device, conditional receiving device sends to the cable television digital set-top box that finds through hfc plant and broadcasts confirmation, informs and specifies this cable television digital set-top box program receiving.
In the order method of phone video on-demand system of the present invention, broadcast data server transmits data in the mode that the mode or the target wheel of data carousel (Data Carousel) are broadcast (Object Carousel) on described hfc plant.Video server is pressed ISO/IEC 13818 standards and is transmitted data on described hfc plant, also be that the video frequency program that video server broadcasts is by the transport stream of ISO/IEC 13818 standards, is sent in the cable television digital set-top box by hfc plant.
Phone video on-demand system provided by the invention and order method thereof have following beneficial effect:
(1) on the one-way CATV top box of digital machine, realizes the service of video request program, reduced the cost of cable television digital set-top box, helped promoting popularizing of digital cable TV top box of digital machine.
(2) programme information is broadcast on the cable television digital set-top box by hfc plant, but the user can understand the programme information of program request by cable television digital set-top box, thereby can recognize up-to-date programme information content in time, easily.
(3) public telephone network is popularized the wide model of scope, has solved the problem that does not have can't realize under the return path situation video-on-demand service, has reduced operation cost.
(4) can make full use of network bandwidth resources, the user has watched that bandwidth used behind the program is recyclable and has used for other user.
(5) response speed is fast, and the user sends by phone after the request, and cable television digital set-top box can forward on the program of user's program request in a short period of time.
Description of drawings
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing:
Fig. 1 is existing video on-demand system block diagram;
Fig. 2 is the phone video on-demand system block diagram of the embodiment of the invention;
Fig. 3 is that the module of the described phone ordering server of the embodiment of the invention constitutes block diagram;
Fig. 4 is the composition diagram of the described information typing of embodiment of the invention module;
Fig. 5 is the user management module handling process block diagram in the described information typing of the embodiment of the invention module;
Fig. 6 is the program resume module flow diagram in the described information typing of the embodiment of the invention module;
Fig. 7 is the preview flow management resume module flow diagram in the described information typing of the embodiment of the invention module;
Fig. 8 is the described programme information generation module of an embodiment of the invention handling process block diagram;
Fig. 9 is the described phone receiving processing module of an embodiment of the invention handling process block diagram.
Embodiment
Fig. 2～9 are depicted as the embodiment of phone video on-demand system of the present invention and order method thereof.
The phone video on-demand system of present embodiment comprises existing cable television digital set-top box, public telephone network (PSTN network), hfc plant and conditional receiving device (CA), and the server group of being made up of phone ordering server, broadcast data server and video server.As shown in Figure 2, in the inside of server group, the phone ordering server is connected with broadcast data server, video server by its Ethernet interface; The server group is connected with the PSTN network through telephone wire by the sound card of phone ordering server, be connected with conditional receiving device by its Ethernet interface, through hfc plant programme information and video signal transmission arrived cable television digital set-top box by the broadcast card of broadcast data server and the broadcast card of video server; Conditional receiving device will broadcast confirmation through hfc plant equally and be transferred on the cable television digital set-top box.
The phone ordering server is a computer that inserts telephone sound card, and the telephone sound card of insertion can be one, also can be polylith.The interface of telephone sound card can be digital junction (as E1) or plain old telephone, and it is fixed that this need come according to the applicable cases of reality.The sound card that inserts can receive the telephone number of dialling in phone by the incoming call display function of public telephone network.On this computer, except telephone sound card, also have an Ethernet interface, the phone ordering server sends information by this interface and broadcast data server, video server and conditional receiving device.
The support programs that move on the phone ordering server have operating system and database.Select the operation platform of windows platform as this server.The database of selecting for use is the SQL Server of Microsoft.The information of depositing in the database comprises the two large divisions, and a part is a programme information, for generating programme so that the programme information source to be provided; Another part is a user profile, is the make a phone call affirmation of identity sowing time of user, can get access to from database when system needs subscriber data.But programme information comprises program names, program length, program classification, program request number and the request video server of request program and carries out some information that program broadcasts needs, but also deposit the programme information of program request in the future, but the advance notice function of request program is provided.Comprise some other auxiliary information in addition, for example, the telephone number that need dial when making the request program that the user can be easy to see.User profile mainly comprises information such as intelligent card numbers that user's user name, telephone number, cable television digital set-top box use, user place physical location.
As shown in Figure 3, the module of phone ordering server is made of three parts: information typing module, programme information generation module and phone receiving processing module.The processing procedure division of each module is as follows:
(1) information typing module
Fig. 4～7 are depicted as the composition and the processing procedure of information typing module, its major function provides input interface, for the operator programme information and user profile are entered in the database and go, the editor's (provide and increase, delete, change function) to programme information in the database and user profile just is provided.As shown in Figure 4, according to the difference of input information effect, information typing module can be divided into four modules again: user management, program, preview flow management.Be respectively the handling process of user management and program shown in Fig. 5,6, can realize increase, modification and deletion respectively subscriber data and program material.Fig. 7 is the handling process of preview flow management module, can realize the modification and the demonstration of preview stream.
(2) programme information generation module
Figure 8 shows that the handling process of programme information generation module, its major function is that programme information is taken out from database, and convert the form that defines to and form file, by Ethernet interface these programme informations are copied under the assigned catalogue of broadcast data server (by the file-sharing function of Windows).
(3) phone receiving processing module
Figure 9 shows that the handling process of phone receiving processing module, its major function is to put telephone call screener according to the user who receives to search corresponding user, determine the intelligent card numbers of cable television digital set-top box and user's physical location, and require the user to import the program request number of required programs.According to program request number and user's physical location, on the passage of appointment, broadcast user's program by Ethernet interface request video server through hfc plant; According to the intelligent card numbers of cable television digital set-top box, the request condition receiving system sends program through hfc plant to this cable television digital set-top box and broadcasts confirmation.
Broadcast data server is a computer that inserts the DVB broadcast card, can move Windows operating system, also can move Unix operating system, selects Windows operating system for use based on degree of stability.The operation of this server mainly is the program information file that monitoring is sent by the phone ordering server, and on the specified channel data is being broadcast on the cable television digital set-top box by hfc plant.
Video server can be very big, is made of a computer cluster and huge hard disk array, also can be very little, only constitute by a computer and a hard disk array, and this need be configured according to user's demand and actual conditions.What hard disk array was deposited is the video file of MPEG-2 form, this document be manufactured with multiple mode, the simplest a kind of exactly by a compressed encoding work station (constituting) by a computer that has the video/audio coding card, carry out compressed encoding by simulation video/audio signal, form the video frequency program file of MPEG-2 form input.By the video server management system, video file is stored in the hard disk array of video server then.Also be inserted with polylith DVB in the video server and broadcast card, next piece of normal conditions broadcasts corresponding one of card and broadcasts the passage video server after receiving the order request that the phone ordering server sends over, and will upward program be broadcasted at the passage (DVB broadcasts card) of appointment.
As shown in Figure 2, the order method of the phone video on-demand system of the embodiment of the invention the steps include:
A. utilize information typing module in the described phone ordering server with in programme information and the user profile input database, and edit as required.
B. utilize in the database of programme information generation module from step a in the phone ordering server to take out programme information and to convert the form that defines to form file, by Ethernet interface these programme informations are copied under the assigned catalogue of broadcast data server (by the file-sharing function of Windows).
C. broadcast data server is monitored the programme information that receives at any time, when finding that this document changes, this document is read from hard disk, carry out conversion by DVB standard logarithmic certificate, broadcast the mode of (Object Carousel) in the mode of data carousel (DataCarousel) or with target wheel then, data are sent on the cable television digital set-top box by hfc plant at specified channel.
D. after said process is finished (said process can be brought in constant renewal in afterwards), the user just can make a phone call request program, when at first the user selected the vod by telephone function of cable television digital set-top box by remote controller, cable television digital set-top box will be searched for specified channel (Frequency point of this specified channel is set) programme information is received in the cable television digital set-top box in the parameter configuration of cable television digital set-top box.The user just can browse on television set and can carry out the program of program request by using a teleswitch like this.The user seeks the program of wishing program request according to the programme information that cable television digital set-top box receives, and the program request number of record required programs.
E. as shown in Figure 9, the user uses phone to dial, and the phone ordering server utilizes the phone receiving processing module to handle.After at first the incoming call display function of sound card by public telephone network receives the telephone number of dialling in phone, search corresponding user and carry out identity validation.If this telephone number does not exist, then refuse the program request of this phone, voice suggestion user program request is unsuccessful, and program request finishes.If find corresponding user,, require the user to import to want the program request number of request program just by voice suggestion.According to program request number and the physical location that finds the user, just can pass through Ethernet interface (employing ICP/IP protocol) request video server and on the passage of appointment, broadcast the program of user's program request.
F. after receiving the message that video server returns success, the phone ordering server utilizes the phone receiving processing module, according to the intelligent card numbers that finds the user, to the conditional receiving device request of sending (by the SMS interface of conditional receiving device), require to transmit program broadcast information to this smart card (cable television digital set-top box at smart card place just) by the mode of mail.After receiving the successful message of e-mail messages transmission, by the voice suggestion user, the program request success can be hung phone, and be watched the program of program request.Whether cable television digital set-top box can eject one and confirm frame after the information of getting the mail, and tells the program of user's program request to begin, watch.The purpose of doing like this is user's family when a plurality of cable television digital set-top box is arranged, and not all cable television digital set-top box is all watched the program of program request, makes things convenient for the user to find the program of program request.Cable television digital set-top box is delivered on the television set after the program that receives is decoded, and the user then can watch the program of program request.
Claims (7)
1, a kind of phone video on-demand system comprises cable television digital set-top box, PSTN network, hfc plant and the server group of being made up of following equipment:
1) phone ordering server, promptly be used to generate can request program programme information, this server has at least one can receive sound card of user profile and order request by the PSTN network, and has the database of depositing programme information and user profile;
2) broadcast data server promptly is used for monitoring and upgrading at the request program information that described phone ordering server sends, and through hfc plant programme information is sent to cable television digital set-top box by broadcast card;
3) video server, promptly be used to deposit video file and have one at least and broadcast card, the request program request that can send according to described phone ordering server, the broadcast card by appointment is sent to cable television digital set-top box through hfc plant with the video file of request program;
In the inside of described server group, the phone ordering server is connected with video server with broadcast data server by its communication interface;
The sound card of described server group by the phone ordering server is connected with the PSTN network through telephone wire, the broadcast card by broadcast data server and the broadcast card of video server through hfc plant with programme information and video signal transmission to the cable television digital set-top box of user side;
It is characterized in that: also comprise being used for sending the conditional receiving device that broadcasts confirmation to cable television digital set-top box, this device will confirm to broadcast message transmission to the cable television digital set-top box of user side through hfc plant, and be connected with described server group through the communication interface of described phone ordering server.
2, phone video on-demand system according to claim 1 is characterized in that: described phone ordering server is made of following module:
1) information typing module promptly is used for providing input interface to realize that the programme information and the user profile of database are carried out typing and editor;
2) programme information generation module promptly is used for taking out programme information and being sent to broadcast data server from database;
3) phone receiving processing module promptly is used to receive vod by telephone, can send request to video server and conditional receiving device as requested.
3, phone video on-demand system according to claim 1 is characterized in that: the broadcast jig of the broadcast card of described broadcast data server and video server has DVB data broadcast standard form.
4, phone video on-demand system according to claim 1 is characterized in that: the communication interface of described phone ordering server is an Ethernet interface.
5, the order method of the described phone video on-demand system of claim 1 may further comprise the steps:
A. utilize information typing module in the described phone ordering server with in programme information and the user profile input database, and edit as required;
B. utilize in the database of programme information generation module from step a in the phone ordering server and to take out programme information and be sent in the described broadcast data server by communication interface;
C. broadcast data server is sent to cable television digital set-top box by broadcast card through hfc plant with the programme information that receives;
D. the user seeks the program of wishing program request according to the programme information that cable television digital set-top box receives, and the program request number of record required programs;
E. the user uses phone to dial, the phone ordering server utilizes the phone receiving processing module to handle, after at first sound card receives the telephone number of dialling in phone by public telephone network, from the user profile of typing in advance, search corresponding user and carry out identity validation; Behind the identity validation, import the program request number of required programs by the voice suggestion user; In conjunction with the physical location of program request number, send playing request to described video server by communication interface with the relative users that finds;
F. video server is sent to cable television digital set-top box through hfc plant with the program of program request number correspondence according to the playing request that the receives broadcast card by appointment; Cable television digital set-top box is delivered on the television set after the program that receives is decoded, and the user then can watch the program of program request;
It is characterized in that, further comprising the steps of:
The phone ordering server sends playing request by communication interface to video server, after receiving the information that video server returns success, the phone ordering server sends request by communication interface to conditional receiving device, conditional receiving device sends to the cable television digital set-top box that finds through hfc plant confirms broadcast information, informs and specifies this cable television digital set-top box program receiving.
6, according to the order method of the described phone video on-demand system of claim 5, it is characterized in that: broadcast data server transmits data in the mode of data carousel or in the mode that target wheel is broadcast on described hfc plant.
7, according to the order method of the described phone video on-demand system of claim 5, it is characterized in that: video server is pressed ISO/IEC 13818 standards and is transmitted data on described hfc plant.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031403298A CN1226879C (en) | 2003-08-29 | 2003-08-29 | Telephone video requesting system and its method |
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| CNB031403298A CN1226879C (en) | 2003-08-29 | 2003-08-29 | Telephone video requesting system and its method |
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| CN1516468A CN1516468A (en) | 2004-07-28 |
| CN1226879C true CN1226879C (en) | 2005-11-09 |
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| CNB031403298A Expired - Fee Related CN1226879C (en) | 2003-08-29 | 2003-08-29 | Telephone video requesting system and its method |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100459701C (en) * | 2004-11-16 | 2009-02-04 | 南京大学 | Adaptive admission controlling method based on measurement for video frequency request system |
| CN100389593C (en) * | 2005-09-23 | 2008-05-21 | 鸿富锦精密工业（深圳）有限公司 | Set top box and its video server overload processing method |
| CN101146212B (en) * | 2006-09-11 | 2010-06-09 | 思华科技（上海）有限公司 | Stream media encapsulation and unpacking method and system for video order network |
| CN1946052A (en) * | 2006-10-19 | 2007-04-11 | 北京四达时代软件技术有限公司 | One-way network video frequency video on demand portal system |
| CN100464512C (en) * | 2006-11-21 | 2009-02-25 | 金纯� | Two-way incremental service realizing method based on digital TV one-way set-top box |
| CN101212643B (en) * | 2006-12-28 | 2011-08-10 | 深圳市同洲电子股份有限公司 | One-way CATV network based interactive VOD system and method |
| JP5251039B2 (en) * | 2007-08-23 | 2013-07-31 | ソニー株式会社 | Information processing apparatus, information processing method, and program |
| US20090099858A1 (en) * | 2007-10-13 | 2009-04-16 | Jeffs Alistair E | Method and system for ordering content from a first device for a selected user device through an interactive interface |
| CN101588474B (en) * | 2009-06-30 | 2011-07-20 | 北京互信通科技有限公司 | Video on demand method and system |
| CN101686381B (en) * | 2009-08-21 | 2012-05-30 | 四川虹微技术有限公司 | Network broadcast media information broadcasting method based on digital television |
| CN202043254U (en) * | 2010-12-10 | 2011-11-16 | 深圳国微技术有限公司 | Video on demand system based on conditional receiving device |
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