CN1370009A - System and method for video broadcast on demand over unidirectional cable TV network - Google Patents
System and method for video broadcast on demand over unidirectional cable TV network Download PDFInfo
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- CN1370009A CN1370009A CN 01105326 CN01105326A CN1370009A CN 1370009 A CN1370009 A CN 1370009A CN 01105326 CN01105326 CN 01105326 CN 01105326 A CN01105326 A CN 01105326A CN 1370009 A CN1370009 A CN 1370009A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000872 buffer Substances 0.000 claims abstract description 19
- 230000003139 buffering effect Effects 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000002452 interceptive effect Effects 0.000 claims description 7
- 238000000151 deposition Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 2
- 238000013475 authorization Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
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- 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
- H04N21/44004—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 buffer management, e.g. video decoder buffer or video display buffer
-
- 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
- H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
- H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
-
- 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
- H04N21/47—End-user applications
- H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
- H04N21/47202—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
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- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6118—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving cable transmission, e.g. using a cable modem
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- 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]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/845—Structuring of content, e.g. decomposing content into time segments
- H04N21/8456—Structuring of content, e.g. decomposing content into time segments by decomposing the content in the time domain, e.g. in time segments
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
- H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Human Computer Interaction (AREA)
- Computer Security & Cryptography (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention relates to a method for realizing video on demand on one way cable TV. The operatino includes following steps. At sending end (1) Speed of video flow of program is raised to n times higher than normal speed and video flow is downloaded. (2) Compiling code flow table. (3) Based on code flow table, code flow table is divided into several segments. (4) The code flow is processed, multiple connected and modulated, then sent to cable TV network. At receiving end (5) multi buffers are setup. (6) Playing back the ordered program, while storing code flow. The invented method realizes video on demand by use of present structure of one way cable TV so as to raise capability of user.
Description
The present invention relates to a kind of VOD system, relate in particular to and a kind ofly realize system and the order method thereof that video is broadcast with reconnaissance on the net at wired TV one-way.
Along with development of science and technology, cable TV has become the important means of the propagation of information, video request program in good time also becomes present fashion, present existing video request program cable television system is to adopt the transmitted in both directions net to realize, mainly comprise three parts: business provides end, transmission network user terminal, and its implementation is very complicated.Suppose to adopt fully on the television network sharing mode, the frequency band of getting 200MHz is used for the descending transmission of interactive service, with 1,000,000 cities is example, suppose that 20 general-purpose families are simultaneously online, the bandwidth of each acquisition is 1KHz so, also be 6Kbit/s (64QAM modulation system), it is inconceivable carrying out interactive service with such speed.Therefore must adopt segmental structure to cable television network.
In addition, sub-district HUB (hub) realizes the two-way access of user to the center of housing estate station.Each sub-district HUB can insert 500 users, this is because the tree structure coax network, noise that network internal produces in the uplink system and invasion interference can make converges (funnel noise) as receiving terminal such as the funnel, for making correctly resoluting signal of receiving terminal, have document to prove about 500 families to be upper limits with theory and practice, a plurality of sub-district HUB (being two among the figure) can be equipped to satisfy the demand that surpasses sub-district, 500 family in a center of housing estate station.Therefore, realize video request program, 500 family users promptly need a cover front end system, and price is very expensive.And it is generally acknowledged that unidirectional network can not realize video request program, its difficult point has two: 1, do not have upward signal, server just can't carry out interaction response like this.2, the required broadband of movie and video programs is huge, can't realize video request program at short notice.
The objective of the invention is in order to overcome that existing Qube is realized the shortcoming of video request program complexity and the present existing wired TV one-way web frame of a kind of employing that provides, can realize that the user broadcasts with reconnaissance, realize system and the method thereof that video is broadcast with reconnaissance at the wired TV one-way net with what save cost and improve user capacity.
The technical scheme that realizes the object of the invention is: a kind of method of broadcasting with reconnaissance at wired TV one-way net realization video, be characterized in, and may further comprise the steps:
At transmitting terminal:
A, the video flowing of each program of playing is improved n with its original playback rate doubly download on the net by video server;
B, the size by buffer memory capacity, the time of each playing programs and the time of download and the time that allows to wait for are worked out the code stream table;
C, video flowing is divided into plurality of sections according to the code stream table;
D, pack, encapsulate and the code stream average rate is handled, and then carry out the code stream multiple connection, by modulation, it is online to be sent to cable TV;
At receiving terminal:
E, a plurality of buffer areas are set, are used to deposit the video flowing of transmission at receiving terminal;
F, employing realize interactive VOD while depositing the method for playing.
Said method, wherein, the speed of described displaying video stream is 10k～10Mbps.
Said method, wherein, described raising n doubly downloads, wherein: 2＜n＜30.
Said method, wherein, the preparation method of described code stream table is:
A, determine the hop count of line number and every row according to the time of the size of buffer memory capacity and the length of each Pgmtime and time of downloading and wait;
The summation of the time that the video flowing of all sections is downloaded in b, the every row should equal the time that one section program video is spread and put;
C, every row must have " 1 " section of a The initial segment " 0 " section and and this The initial segment smooth connection at least;
Every row will have a segment number with the preceding paragraph smooth connection in d, other several row;
E, till cycle arrangement.
Said method, wherein, described receiving terminal realizes that the rule of program request accessing video stream is:
A, current reception segment number less than current broadcast segment number with than the little 1 section buffering hop count sum of buffering hop count;
B, current reception segment number are greater than current broadcast segment number and buffering hop count sum.
If the c buffer memory is full, replaces buffer memory and deposited the maximum segment number of breeze way.
Be exclusively used in the system that realizes said method and adopt, be characterized in, comprise cable TV network, network access server, management server, video server, subscriber computer top box, connect by grid line; Described management server, video server couple together by inner Ethernet, under the unified management of manager, the video distribution service device is with the transmission card of video flowing by its inside, deliver to modulator, sending to the wired TV one-way net through mixing again, deliver to the user side set-top box by the wired TV one-way net, is that this video flowing is carried out FM reception by the user side set-top box, deposit, withdraw through buffering again, realize interactive VOD on the unidirectional network.
Because the present invention has adopted above technical scheme, need not to change existing cable TV network structure, receive principle as long as make user's terminal top box meet the present invention, server at front end sends by code stream of the present invention, can be implemented in existing cable TV and broadcast same program or the different programs of program request by the user with reconnaissance on the net, thereby infrastructure cost, equipment cost and the management cost of cable TV network are reduced.
Concrete characteristic performance of the present invention is further provided by following embodiment and accompanying drawing thereof.
Fig. 1 is a prior art system configuration schematic diagram.
Fig. 2 is a system configuration schematic diagram of the present invention.
Fig. 3 is that video server of the present invention sends information flow chart.
Fig. 4 is a code stream send mode schematic diagram of the present invention.
Fig. 5 is a code stream table loop play schematic diagram of the present invention.
See also accompanying drawing 2.The present invention realizes the system that video is broadcast with reconnaissance on the net at wired TV one-way, comprises cable TV network, network access server, management server, video server, subscriber computer top box, connects by grid line.
Fig. 3 is that video server of the present invention sends information flow chart.Described management server, video server couple together by inner Ethernet, under the unified management of manager, the video distribution service device is with the transmission card of video flowing by its inside, deliver to modulator, send to the wired TV one-way net through mixing again, deliver to the user side set-top box, this video flowing is carried out FM reception by the user side set-top box by the wired TV one-way net, deposit, withdraw through buffering again, realize interactive VOD on the unidirectional network.
The method of program request of the present invention may further comprise the steps:
At transmitting terminal:
A, the video flowing of each program of playing is improved n with its original speed doubly download on the net by video server;
B, the size by buffer memory capacity, the time of each playing programs and the time of download are worked out the code stream table;
C, video flowing is divided into plurality of sections according to the code stream table;
D, pack again, encapsulation, code stream average rate handle, and then carries out the code stream multiple connection, by modulation, it is online to be sent to cable TV;
At receiving terminal:
E, Y buffer area is set at receiving terminal;
F, employing guarantee can receive adjacent back one section after playing the last period while depositing the method for playing, and broadcast so that can simultaneously receive one side, and be intact a play-on-demand program continuously.
Fig. 4 is a code stream send mode schematic diagram of the present invention.Packet header launches to have 13 PID number (the code stream segment numbers of sign), high 6 (7,8,9,10,11,12) of its PID to be used for distinguishing the different sections of same program, 2
6=64 sections,, still can enlarge the PID position and solve if do not satisfy.Represent EPG (electronic program list), authorization message, markers, integrated information, stock information with other states.The set-top box mainboard receives the menu information of remote control program request, can obtain above-mentioned four signals, passes through I
2C interface is controlled download code stream.
In the receiving terminal set-top box, after the QAM demodulation, the non-user's program request signal in the channel signal is by the output of decoding to the back of channel selector switch direct sending from tuner.If from the user program request signal of tuner after the QAM demodulation down surface current from a plurality of programs, select a program and one side to play to the program process control module, one side is accepted other section program, guarantees continuous broadcast.When sending the back buffering area, code stream is carried out smoothing processing, deliver to the code stream of data RAM (keeping in), it is reverted to normal code stream.
The preparation method of code stream table of the present invention is:
A, determine the hop count of line number and every row according to the time of the size of buffer memory capacity and the length of each Pgmtime and time of downloading and wait;
The summation of the time that the video flowing of all sections is downloaded in b, the every row should equal the time that one section program video is spread and put;
C, every row must have " 1 " section of a The initial segment " 0 " section and and this The initial segment smooth connection at least;
Every row will have a segment number with the preceding paragraph smooth connection in d, other several row;
E, till cycle arrangement.
The code stream layout table of a program is with its loop play, as Fig. 5.
In the actual use of the present invention is to take such measure:
1, the speed of the video flowing of normal play (10k～10Mbps) improve n doubly to download;
2, video flowing is divided into plurality of sections, and arranges in sequence;
3, determine the buffering hop count, and open up corresponding buffering area at receiving terminal, condition is: the long-pending total buffer amount that equals of section capacity and buffering area number;
4, playing in the time that allows to wait for, must be able to find The initial segment " 0 " section;
5, before broadcast " 0 " section is intact, must to deposit " 1 " section in; One finds " 2 " section surely before playing " 1 " section, by that analogy, finishes until a program.
For example: the speed (for example 1.5Mbps) of normal play video stream is improved n doubly download, wherein: 2＜n＜30.Video flowing is divided into plurality of sections, is example with 40 minutes programs, is divided into 20 sections, average delay program request time≤30 second, and its code stream table is as follows:
This code stream layout table, can guarantee write be over after, when playing " 0 " section, assurance can be received " 1 " section, and can simultaneously receive one side and broadcast, and is continuously a program of receiving to be finished watching.
This program circuit proves that above-mentioned code stream is can reach to realize broadcasting with reconnaissance of three programs simultaneously on unidirectional network.Because sending stream is 12Mbps, a physical channel 38.5Mbps.12Mbps×3＝36Mbps。See the 12Mbps code stream from example, can realize program request, thereby also can realize three program requests simultaneously.
Utilize the code stream table of establishment, front end system sends smoothly according to the code stream segmentation, and all marks look header laber number on each section, and the user enters the program request demand to any time like this, can both allow to find in the stand-by period need not.So user terminal can connect the signal that front end sends in playing process, and the section content that can receive is as required kept in, that is: millions upon millions of users (cable television network cover STB user), enter at any time, " 0 " section (representing segment number with PID before every section) can be found in average latency＜30 second, after receiving " 0 " section, just play " 0 " section in 120 seconds, 4 sections of handle＞0+4 section deposit buffering area in simultaneously.
Because inbound pacing than the fast n of broadcasting speed doubly, under certain buffer size situation, this buffer memory can be kept in certain hop count, and we suppose that it is y.
Deposit, withdraw by following rule like this, we just can reach the function of unidirectional demanding by the code stream table:
1.C1＜CS+(y-1)
Current reception segment number less than current broadcast segment number with than buffering hop count little 1 section buffering hop count sum;
2.C1＜CS+y
Current reception segment number is greater than current broadcast segment number and buffering hop count sum.
3., replace buffer memory and deposited the maximum segment number CM of breeze way if buffer memory is full.
So just guarantee with m (equaling 5 here) buffering area, just can realize program request, play continuously after the program request from " 0 " section.
In the above-mentioned logical formula:
CS represents current broadcast section; C1 represents current receiver section; Y represents to cushion hop count; CM represents to deposit the maximum segment number of breeze way.
According to thought of the present invention, receive principle as long as make user's terminal top box meet the present invention, server at front end sends by code stream of the present invention, can make original wired TV one-way net system realize broadcasting the function of program, and can under the situation of not changing network configuration, capacity be increased with reconnaissance, a city only needs can hold 300-500 ten thousand even more users once the cover front end system, the different programs of program of program request or program request are simultaneously saved cost, improve efficiency of transmission.
Claims (6)
1, a kind ofly realize the method that video is broadcast with reconnaissance on the net, it is characterized in that, may further comprise the steps at wired TV one-way:
At transmitting terminal:
A, the video flowing of each program of playing is improved n with its original playback rate doubly download on the net by video server;
B, the size by buffer memory capacity, the time of each playing programs and the time of download and the time that allows to wait for are worked out the code stream table;
C, video flowing is divided into plurality of sections according to the code stream table;
D, pack, encapsulate and the code stream average rate is handled, and then carry out the code stream multiple connection, by modulation, it is online to be sent to cable TV;
At receiving terminal:
E, a plurality of buffer areas are set, are used to deposit the video flowing of transmission at receiving terminal;
F, employing realize interactive VOD while depositing the method for playing.
2, method according to claim 1 is characterized in that, the speed of described displaying video stream is 10k～10Mbps.
3, method according to claim 1 is characterized in that, n times of speed of described raising is downloaded, wherein: 2＜n＜30.
4, method according to claim 1 is characterized in that, the preparation method of described code stream table is:
A, determine the hop count of line number and every row according to the time of the size of buffer memory capacity and the length of each Pgmtime and time of downloading and wait;
The summation of the time that the video flowing of all sections is downloaded in b, the every row should equal the time that one section program video is spread and put;
C, every row must have " 1 " section of a The initial segment " 0 " section and and this The initial segment smooth connection at least;
Every row will have a segment number with the preceding paragraph smooth connection in d, other several row;
E, till cycle arrangement.
5, method according to claim 1 is characterized in that, described receiving terminal realizes that the rule of program request accessing video stream is:
A, current reception segment number less than current broadcast segment number with than the little 1 section buffering hop count sum of buffering hop count;
B, current reception segment number are greater than current broadcast segment number and buffering hop count sum.
If the c buffer memory is full, replaces buffer memory and deposited the maximum segment number of breeze way.
6, a kind of system that is exclusively used in the method for realization claim 1 and adopts is characterized in that, comprises cable TV network, network access server, management server, video server, subscriber computer top box, connects by grid line; Described management server, video server couple together by inner Ethernet, under the unified management of manager, the video distribution service device is with the transmission card of video flowing by its inside, deliver to modulator, send to the wired TV one-way net through mixing again, deliver to the user side set-top box, this video flowing is carried out FM reception by the user side set-top box by the wired TV one-way net, deposit, withdraw through buffering again, realize interactive VOD on the unidirectional network.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01105326 CN1370009A (en) | 2001-02-13 | 2001-02-13 | System and method for video broadcast on demand over unidirectional cable TV network |
| PCT/CN2001/001160 WO2002076101A1 (en) | 2001-02-13 | 2001-07-09 | A system and an on-demand method for the same which achieves the random selected video on-demand on a cable tv one-way network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01105326 CN1370009A (en) | 2001-02-13 | 2001-02-13 | System and method for video broadcast on demand over unidirectional cable TV network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1370009A true CN1370009A (en) | 2002-09-18 |
Family
ID=4654408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01105326 Pending CN1370009A (en) | 2001-02-13 | 2001-02-13 | System and method for video broadcast on demand over unidirectional cable TV network |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1370009A (en) |
| WO (1) | WO2002076101A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375091C (en) * | 2004-11-16 | 2008-03-12 | 萧学文 | Method and system for realizing sound stream playing based on BREW platform |
| CN100442845C (en) * | 2006-03-08 | 2008-12-10 | 北京北大方正电子有限公司 | Method of inspecting video material in low digital codes stream |
| CN101399691B (en) * | 2008-10-21 | 2011-09-07 | 北京闪联互动网络科技有限责任公司 | Multimedia on-line playing method, device for mobile terminal and mobile terminal thereof |
| CN102625194A (en) * | 2011-01-26 | 2012-08-01 | 郑州威科姆科技股份有限公司 | General document flow mode VOD method based on IPQAM |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6064422A (en) * | 1996-04-29 | 2000-05-16 | The Goolcharan Charitable Trust | Telecommunication system for broadcast quality video transmission |
| KR20010080122A (en) * | 1998-10-13 | 2001-08-22 | 매클린토크 샤운 엘 | Software application lifecycle and management for broadcast applications |
-
2001
- 2001-02-13 CN CN 01105326 patent/CN1370009A/en active Pending
- 2001-07-09 WO PCT/CN2001/001160 patent/WO2002076101A1/en active Application Filing
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375091C (en) * | 2004-11-16 | 2008-03-12 | 萧学文 | Method and system for realizing sound stream playing based on BREW platform |
| CN100442845C (en) * | 2006-03-08 | 2008-12-10 | 北京北大方正电子有限公司 | Method of inspecting video material in low digital codes stream |
| CN101399691B (en) * | 2008-10-21 | 2011-09-07 | 北京闪联互动网络科技有限责任公司 | Multimedia on-line playing method, device for mobile terminal and mobile terminal thereof |
| CN102625194A (en) * | 2011-01-26 | 2012-08-01 | 郑州威科姆科技股份有限公司 | General document flow mode VOD method based on IPQAM |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002076101A1 (en) | 2002-09-26 |
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