CN1874491A - Video on demand method in digital TV - Google Patents
Video on demand method in digital TV Download PDFInfo
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- CN1874491A CN1874491A CNA2006100212689A CN200610021268A CN1874491A CN 1874491 A CN1874491 A CN 1874491A CN A2006100212689 A CNA2006100212689 A CN A2006100212689A CN 200610021268 A CN200610021268 A CN 200610021268A CN 1874491 A CN1874491 A CN 1874491A
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- top box
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Abstract
The method comprises: 1) starting the video request application; 2) tuning the set-top box to a reference frequency point to get the PAT table in said reference point an to analyze the ID of the service area from the PAT table; 3) the set-top box sends the request of ordering the TV program carrying the ID of service area and the card's number information of smart card to the vide request application server; the video request application server sends the concurrent flow carrying the ordered content to the edge modulator corresponding to the ID of the service area; 5) the edge modulator sends the RF signals of concurrent flow to its corresponding set-top box; 6) the set-top box receives the RF signals, and after a demodulation it plays them.
Description
Technical field
The present invention relates to cable digital TV field based on hfc plant.
Background technology
VOD (video request program) system based on HFC (hybrid fiber coax), utilize the technology of space division multiplexing and frequency division multiplexing, the network that covers the user is divided into several service areas, in different service areas, uses identical frequency to provide video flowing as the user.System need be numbered (this numbering is called service area ID) to service area, carries out the addressing location according to user's service area ID, pushes video flowing.
In the system that uses, service area ID inquires about by artificial mode at present: according to user's place physical location and the planning of ready-made in advance service area, determine the service area ID of user region; Manual entry in system then.After the manual entry, in system, set up the database of corresponding relation between the smart card ID of service area ID and user terminal, when user terminal has order request, the video-on-demand applications server of front end inquires its corresponding service area ID according to smart card ID in this database, the edge modulator of video flowing by this service area ID institute corresponding with service district is transferred to this user terminal.
But there is following shortcoming in this manual type: a) artificial enquiry, be logged in and be difficult to avoid mistake in the operation; B) when the edge of two service areas is dropped in user's address, be difficult to service area is discerned; C) when the migration of user's address, need carry out the inquiry again and the typing of service area; D) when the service area capacity full, in the time of need splitting, the service area ID of all users in this service area needs layout again, typing.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiencies in the prior art, provides a kind of and can carry out the user place service area VOD method of identification automatically.
The technical solution adopted for the present invention to solve the technical problems is: the VOD method of this Digital Television comprises the steps:
1) set-top box starts video-on-demand applications;
2) set-top box is tuned to the reference frequency point of video-on-demand applications server, obtains the pat table of this reference frequency point and parse service area ID from this pat table;
3) set-top box sends the order request of carrying service area ID and customer identification information to the video-on-demand applications server;
4) the video-on-demand applications server sends the concurrent stream that is loaded with on-demand content to the pairing edge modulator of this service area ID, and being sent to set-top box by the frequency that the IP link will this concurrent stream place, this edge modulator sends the radiofrequency signal of this concurrent stream to set-top box;
5) set-top box receives this radiofrequency signal, and to playing after its demodulation.
Described step 1) and 2) also comprise steps A between): set-top box is obtained reference frequency point by IP chain road direction video-on-demand applications server.
Described step 4) also comprises step 4a): the video-on-demand applications server also sends the Program_id that is used for distinguishing the different concurrent streams of this frequency to set-top box simultaneously.
Described customer identification information is a smart card numbers.
The invention has the beneficial effects as follows that a) service area no longer needs manual allocation and typing; B) service area is discerned automatically, can not have differentiation mistake that causes because of the user geographical position is special and the mistake that other people cause for factor; C) after the migration of user address, no longer need to reconfigure, set-top box can directly be used; D) because general headend does not have user's service area assignment record, therefore when service area is readjusted planning, unaffected to the user, the work of also having save amendment record; E) the video-on-demand applications server corresponding relation of recording user terminal set top box and service area not, but discern the residing service area of this set-top box automatically, finish response to order request.
Description of drawings
Fig. 1 is the transmission schematic diagram of VOD system signal of the present invention.
Fig. 2 represents the corresponding relation between the terminal and general headend among the present invention.
Fig. 3 is the flow chart of the VOD method of Digital Television of the present invention.
Embodiment
See also Fig. 1 and Fig. 2, in the video on-demand system based on hfc plant, the signal that set-top box receives is made up of broadcast singal, CMTS signal and VOD signal.Carry out transfer of data by backbone network between the video-on-demand applications server of this general headend and the branch center, the signal of its transmission comprises broadcast singal, IP metropolitan area network signal and VOD pushing video streaming signal.The branch center adopts hfc plant to be connected with user terminal, and its information transmitted comprises VOD signal, CMTS downstream signal, broadcast singal and CMTS upward signal, and the frequency of above-mentioned various signals reduces successively.This branch center is geographic zoning, as a city being divided into A, B, three branch centers of C, the then corresponding a plurality of service areas in each branch center, promptly can place the edge modulator of a plurality of service areas, the set-top box that the edge modulator of each service area then can corresponding a plurality of user terminals in each branch center.
Because the video-on-demand signals of each service area is all different, but adopt identical frequency to transmit (space division multiplexing), so in video-on-demand signals, can send service area ID, set-top box is obtained the information of reference frequency point by the IP link from the video-on-demand applications server of general headend, then set-top box can be resolved in reference frequency point and be obtained service area ID.
See also Fig. 3, the VOD method of Digital Television of the present invention comprises the steps:
1) after set-top box is opened the VOD application,, from the video-on-demand applications server of general headend, obtains the information of reference frequency point by the IP link that built-in Cable Modem, CMTS (CableModem terminal system) and MAN (metropolitan area network) set up.The unlatching of this video on-demand function can be pressed " program request " key realization of Digital Television by the user, perhaps selects by menu.The information of this reference frequency point gives the tuner of set-top box as frequency locking, and this information comprises frequency, symbol rate and modulation system etc., is that 850MHZ, symbol rate are that 6.875Msybl/s, modulation system are 64QAM as frequency.In the present embodiment, this reference frequency point is fixed, and by allowing set-top box obtain from the video-on-demand applications server of general headend, is that set-top box is also adjusted easily for the contingency reference frequency point changes.
2) set-top box be tuned to reference frequency point (850MHZ as the aforementioned), obtain pat table, read TS_id, parse service area ID.Each service area has all been planned TS_id, and with the set-top box broadcasting of this TS_id information in service area, set-top box need arrive in the reference frequency point and read.
3) set-top box is when initiating RTSP (real-time streaming protocol) order request to general headend, carried service area ID and this smart card of set-top box number.When Digital Television is used, need insert smart card in each set-top box, the card number of this smart card promptly is used for each set-top box is carried out identification.
4) general headend is according to service area ID, the concurrent stream that is loaded with on-demand content is pushed to the edge modulator (being IP-QAM) of the pairing service area of this service area ID, and by the IP link will this concurrent stream place frequency (Program_id is used for distinguishing the different concurrent stream of same frequency with Program_id, see Moving Picture Experts Group-2 ISO/IEC 13818-1 for details) etc. information announcement machine top box, this edge modulator then sends the radiofrequency signal of this concurrent stream to set-top box.In the present embodiment, each service area can have 16 frequencies that send concurrent stream at most, by edge modulator concurrent stream modulation is sent to set-top box.
5) set-top box receives this radiofrequency signal according to the information (concurrent stream place frequency and Program_id) that general headend sends, and to playing after this signal demodulation.
Set-top box is by the reference frequency point of VOD, and the TS_id that transmits in the pat table with this frequency carries out the identification of service area.TS_id is to the distinctive mark of different transport stream in the network (seeing Moving Picture Experts Group-2 ISO/IEC 13818-1 for details), and each transport stream is used a physics frequency transmission.TS_id is the integer (umisbf, signless integer uimsbf unsigned integer most significant bit first) of a 16bit, planning such as the table 1 of this TS_id:
The planning of table 1.TS_id
| The expression meaning | Figure place | Scope | Explanation | |
| 1 | Service area ID | 12bit | 0～4095 | 4 decimal number, front two is represented branch center numbering (numbering 00 keeps use), which service area in this branch center of two bit representations, back |
| 2 | Identification id | 4bit | 0～15 | In same service area, distinguish different TS (transport stream) |
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of being submitted to.
Claims (4)
1. the VOD method of a Digital Television is characterized in that: comprise the steps:
1) starts video-on-demand applications;
2) set-top box is tuned to reference frequency point, obtains the pat table of this frequency and parse service area ID from this pat table;
3) set-top box sends the order request of carrying service area ID and customer identification information to the video-on-demand applications server;
4) the video-on-demand applications server sends the concurrent stream that is loaded with on-demand content to the pairing edge modulator of this service area ID, and being sent to set-top box by the frequency that the IP link will this concurrent stream place, this edge modulator sends the radiofrequency signal of this concurrent stream to set-top box;
5) set-top box receives this radiofrequency signal, and to playing after its demodulation.
2. the VOD method of a kind of Digital Television as claimed in claim 1 is characterized in that: also comprise steps A described step 1) and 2)): set-top box is obtained reference frequency point by IP chain road direction video-on-demand applications server.
3. the VOD method of a kind of Digital Television as claimed in claim 1 or 2, it is characterized in that: described step 4) also comprises step 4a): the video-on-demand applications server also sends the Program_id that is used for distinguishing the different concurrent streams of this frequency to set-top box simultaneously.
4. the VOD method of a kind of Digital Television as claimed in claim 1 or 2, it is characterized in that: described customer identification information is a smart card numbers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100212689A CN1874491A (en) | 2006-06-21 | 2006-06-21 | Video on demand method in digital TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100212689A CN1874491A (en) | 2006-06-21 | 2006-06-21 | Video on demand method in digital TV |
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| CN1874491A true CN1874491A (en) | 2006-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2006100212689A Pending CN1874491A (en) | 2006-06-21 | 2006-06-21 | Video on demand method in digital TV |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800841A (en) * | 2010-03-19 | 2010-08-11 | 四川长虹电器股份有限公司 | Method for set-top box fast accessing NVOD service |
| CN101662662B (en) * | 2009-09-24 | 2011-11-30 | 深圳市同洲电子股份有限公司 | Video-on-demand method, system and set top box |
| CN101184218B (en) * | 2007-03-09 | 2012-02-01 | 深圳创维数字技术股份有限公司 | Digital television service system processing information method and device |
-
2006
- 2006-06-21 CN CNA2006100212689A patent/CN1874491A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101184218B (en) * | 2007-03-09 | 2012-02-01 | 深圳创维数字技术股份有限公司 | Digital television service system processing information method and device |
| CN101662662B (en) * | 2009-09-24 | 2011-11-30 | 深圳市同洲电子股份有限公司 | Video-on-demand method, system and set top box |
| CN101800841A (en) * | 2010-03-19 | 2010-08-11 | 四川长虹电器股份有限公司 | Method for set-top box fast accessing NVOD service |
| CN101800841B (en) * | 2010-03-19 | 2013-05-08 | 四川长虹电器股份有限公司 | Method for set-top box fast accessing NVOD service |
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