CN1414790A - Video frequency program requesting system and method capable of reducing the use of wired television network bandwidth - Google Patents
Video frequency program requesting system and method capable of reducing the use of wired television network bandwidth Download PDFInfo
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Abstract
A visual program requiesting system to decrease the occupation of cable TV network bandwidth includes judging whether the second user end selects the same movie and music information with the first user end in the time of time difference of different times or not. If it is, which channel is used to receive this movie and music information and how long time has been received by the first user end are checked. The received movice and music information in received time at the first user end is output by using the unused channel at the second user end and makes it a former set of movie and music information, and at the same time, record the movie and music information which is receiving by the first user end at the present time as well as to make it a later set of movie and music information.
Description
Technical field
The invention relates to a kind of video on-demand system and method, and particularly relevant for a kind of video on-demand system and method for using the cable TV network bandwidth that reduce.
Background technology
Be layed in the quick progress of communication network and wide frequency communication network technology in a large number along with optical fiber, recent global telecommunications company actively drops into the field of wideband service, attempt can provide integrates communication, amusement and information service in consolidated network, to satisfy the quick growth of people's demand.
And also because the quick progress of wide frequency communication network technology, make people by TV in the family passive type see that the status of TV programme changes gradually, gradually everybody can be at home from ordering the TV programme of desiring to watch, need not waste the stand-by period of advertisement, need not watch boring program yet, as long as informing you desires the TV programme of watching or information now and can play to the subscriber immediately and watch that this is video request program (Video On Demand; Be called for short VOD).
But the common video VOD system can consume a large amount of cable TV network bandwidth, and user's the number and the conveying capacity and the speed of data are restricted when propagating audio and video information.Because under the situation of a plurality of subscribers in one time difference of mutual distance scope and all subscribe to same program or film, then same film will occupy sizable bandwidth.Give an example, per second occupies the bandwidth of 4Mbit when a film is being play, and time-consuming 4 hours of this film, and just there are 4 subscribers all to subscribe to same film whenever differing under one hour the situation, then suppose all to have viewed and admired under the time point of this film whole subscribers, this film can account for the bandwidth sum at most up to 4 (Mbit/sec) * 60 (sec/min) * 60 (min/hr) * 4 (hr) *, 4 (subscriber)=230400Mbit.
Therefore, if can when a plurality of subscribers subscribe to same information in a time difference scope, can reduce the occupied bandwidth of this same information, then can under fixed-bandwidth, increase the conveying capacity and the transfer rate of data.
Summary of the invention
In view of this, the present invention proposes a kind of video on-demand system that uses the cable TV network bandwidth that reduces, and relates to when subscribing to same information in the scope of a plurality of subscribers in a time difference scope, reduces the occupied bandwidth of this same information.
This video on-demand system that reduces use cable TV network bandwidth comprises: video server, playing device and set-top box.
Wherein, video server, be in order to the demand of judging each client in differing a time difference scope, whether selected identical audio and video information is arranged.Playing device then is to be present in each client, the selected audio and video information of output client.Set-top box also is to be present in each client and the connection playing device, connects video server by network simultaneously, wherein comprises several tuners in each set-top box.
Receive same audio and video information under second client and the situation of first client in differing a period of time difference scope and work as, then the included set-top box of second client can begin to store audio and video information that first user side receiving to become a back segment audio and video information via first tuner, video server also can export the preceding audio and video information that receives of first client to second client to become a leading portion audio and video information once more in the time difference scope simultaneously, so that second client under set-top box after exporting the leading portion audio and video information to playing device via second tuner, can continue exports the back segment audio and video information to playing device.
The present invention proposes a kind of VOD method that uses the cable TV network bandwidth that reduces again, comprise: judge that earlier second client is differing in a period of time difference scope with first client, whether selected identical audio and video information is arranged, if have, check that then first client is the time of utilizing which channel in the communication network to receive this audio and video information and having received this audio and video information.Then, utilizing in the communication network one not use channel to export the audio and video information that first client receives in time of reception becomes a leading portion audio and video information, and second client can be recorded the audio and video information that present first user side receiving simultaneously and becomes a back segment audio and video information.And after second client uses the leading portion audio and video information, then continue and use the back segment audio and video information of having recorded.
In sum, the present invention reduces having at least two clients to receive the shared bandwidth of same audio and video information in a time difference scope, the audio and video information that allows first user side receive is stored in second client, and the audio and video information that previous first client of general has received in the time difference scope, be sent to second client once more, when second client uses the audio and video information that first client received in the time difference scope after, then can continue and use the back segment audio and video information that is stored in local terminal, so can ahead of time the bandwidth that takies be discharged.
Description of drawings
Fig. 1 is the block diagram of a kind of video on-demand system of a preferred embodiment of the present invention;
Fig. 2 is the interior block diagram of the present invention according to the set-top box of Fig. 1;
Fig. 3 is the detailed interior block diagram of the present invention according to Fig. 2 set-top box;
Fig. 4 is a kind of flow chart of steps that reduces the VOD method that uses the cable TV network bandwidth of a preferred embodiment of the present invention;
Fig. 5 is having at least two clients to receive the schematic diagram of same audio and video information in distance time difference scope for the present invention.
100: the video request program playout center
110: video server
200: network
300,400: client
310,410,500: set-top box
320,420,540: playing device
510: divide column unit
520: processing unit
530: the projection unit
512,514: tuner
522: storage element
524: decoding unit
Step s600 to step s614 be implementation step of the present invention
Embodiment
The video server of video on-demand system and client are to be dispersed in two ground, and nature must have suitable communication network therebetween, and this communication network will have bigger bandwidth, is enough to hold many channels and transmits jointly.In addition, play in order to allow client fully be controlled audio and video information, communication network must can transmit reverse control information.In a word, for making the video on-demand system normal operation, communication network is to need to descend to pass (down stream) multitude of video program, and can upload full duplex (Full Duplex) communication network of (up stream) control information, but in the present invention, also can utilize phone to receive data, so video on-demand system not necessarily is required to be full duplex (Full Duplex) communication network by the selected desire of telephone wire.
Wherein, video on-demand system (VOD) is divided into 3 kinds, is respectively cable television VOD system, computer network-based video VOD system and compromise formula video on-demand system.
Complete analog VOD system develops for cable television system, its main purpose is on existing cable television network winding thread, pass and carry new digital program signal, and constitute limited feedback network and make client transmit control signal by this feedback network, this is to be similar to hybrid-type mode most, and its program bandwidth expansion capacity also is fabulous, but because the feedback network of cable TV network part speed is limited, so when big quantity service object, the passback of control command will be affected.
And the VOD system of pure digi-tal formula, basically be the method for service of a kind of single-point to single-point, though can carry on its framework by single-point to multiple spot or multi-multipoint method of service, because the development restriction of current technology makes the method for service of non-single-point can be subjected to the restriction of the network architecture.Because its image and control signal all transmit via the digital computer network line, it is just many greatly more than general network to the requirement of cable TV network bandwidth.
Compromise formula VOD system then is the transmission data class of comprehensive above-mentioned two kinds of VOD systems, and its method is audio and video information to be retained in the pattern of simulation, and only control signal is transmitted by digital network.
No matter be the VOD system of which kind, all be identical for the demand of bandwidth, so the present invention is promptly provided at this and is reduced video on-demand system and the method for using the cable TV network bandwidth.
Please merge with reference to Fig. 1, Fig. 2 and Fig. 3, it is a kind of video on-demand system that uses the cable TV network bandwidth that reduces according to a preferred embodiment of the present invention, be applicable to and reduce under the situation of a plurality of clients in mutual distance a period of time difference scope, employed bandwidth when receiving same audio and video information.
Wherein the minimizing in Fig. 1 uses the video on-demand system of cable TV network bandwidth to comprise: video server 110, playing device 320 and 420, and set-top box 310 and 410.Wherein, video server 110, it promptly is the demand of customer in response end in video request program playout center 100, in the hope of the selected video-audio data of output client in the time, in addition, video server 110 also can be in order to have judged whether plural client demand in the time difference scope, selected identical audio and video information.And in the so-called time difference scope, be meant not receive audio and video information and have remaining client also to begin to receive under the situation of same audio and video information and take place in first client.
In addition, playing device all is to be present in each client, promptly is to be present in the client 300 as playing device 320, and playing device 420 then is to be present in the client 400.Each playing device is in order to the selected audio and video information of output client, just comes out to view and admire to the subscriber by this playing device program or movie that client is selected.Wherein, this playing device can be television set or computer system.
Set-top box (STB; Set Top Box), it also is the playing device that is present in each client and connects in the client, connect video server 110 by communication network simultaneously, because communication network is divided into analog network and digital network, so set-top box that is possessed in the client, can receive analog information that analog network transmits reaches television set with it and displays, or receive the numerical data that digital network transmits it is reached on the computer system, with its computer screen numerical data is shown.
Wherein, in each set-top box, comprise as shown in Figure 2 branch column unit 510, processing unit 520 and projection unit 530.
Branch column unit 510 wherein, connect video server 110 by communication network, be divided into leading portion audio and video information and back segment audio and video information in order to the audio and video information that video server 110 is transmitted, wherein, judge more Zao selected this audio and video information of client that has other client to receive this audio and video information than present desire at video server 110, then video server 110 can notify this client need record work, and in minute column unit 510 included several tuners (tuner 512 as shown in Figure 3 and tuner 514), promptly can be in order to dispensing leading portion audio and video information and back segment audio and video information and the processing unit 520 that divides column unit 510 to be connected, wherein, processing unit 520 is in order to output leading portion audio and video information and storage back segment audio and video information.Projection unit 530, connection processing unit 520 in order to export leading portion audio and video information or back segment audio and video information to playing device 540, is viewed and admired for client.
In addition, comprise in the processing unit 520 as shown in Figure 3: storage element 522 and decoding unit 524.
Wherein, storage element 522, connect and divide column unit 510, in order to store the back segment audio and video information, and decoding unit 524 connects and divides column unit 510, storage element 522 and projection unit 530, in order to leading portion audio and video information and back segment audio and video information are decoded, because audio and video information is encoded in video server, just may be output to projection unit 530 so need decode.
In the present embodiment, suppose to have two clients in distance one time difference scope, to receive same audio and video information, therefore only draw two tuning (tuner), but in fact in minute column unit 510, have a plurality of tuners.
Wherein, when client 400 with situation in client 300 differs a period of time difference scope under when receiving the audio and video information identical too with client 300, set-top box 400 included in the client 400 can begin to utilize the storage element 522 in the processing unit 520 to store the back segment audio and video information C2 that clients 300 are receiving via first tuner (being assumed to be the tuner 512 of Fig. 3).Wherein, the audio and video information that we claim client 300 to be received in this section time difference scope is leading portion audio and video information C1, and the audio and video information that storage element 522 storage clients 300 are receiving is back segment audio and video information C2.
And store the back segment audio and video information C2 while that client 300 is receiving at storage element 522, video server 110 also can export the leading portion audio and video information C1 that is received before the client 300 to client 400 via second tuner (being assumed to be the tuner 514 of Fig. 3) once more in the time difference scope, so that client 400 affiliated set-top box 410 are after exporting leading portion audio and video information C1 to playing device 540, the back segment audio and video information C2 that will store that can continue exports playing device 540 to, discharges with the shared bandwidth of audio and video information that ahead of time client 300 and client 400 is all received.
And the audio and video information that each client received can comprise video information and audio-frequency information, for example program request film service (Movies On Demand; Abbreviation MOD), program request Karaoke service (Karaoke On Demand; Abbreviation KOD), IP Information On Demand service (InformationOn Demand; Be called for short IOD) or the like, unified to provide by the video server in the video request program playout center 100 110, and when audio and video information that the client desire is selected to want, then need transmit a control signal allows video server 110 know what information this transmits and give client, wherein, control signal can be to be provided by mode voice call, or provides by remote controller, with the operation of selecting.
Please merge with reference to Fig. 4 and Fig. 5, it is a kind of VOD method that uses the cable TV network bandwidth that reduces according to a preferred embodiment of the present invention, be applicable to and reduce under the situation of a plurality of clients in mutual distance a period of time difference scope, employed bandwidth when receiving same audio and video information.
This VOD method that reduces use cable TV network bandwidth comprises: earlier in step s600, list the audio and video information (programme content) that an information index (for example listing) selects desire to receive or view and admire to client, allow the client can be in step s602, the audio and video information that utilizes this information index to select desire to receive, for instance, suppose to have respectively first client and second client front and back to enter listing and select film X.
Then need in step s604, judge whether second client when differing in a period of time difference scope with first client, has selected identical audio and video information.For instance, we are customer end A with first client, with second client is customer end B, if program that customer end B is selected and customer end A are not simultaneously, in step s606, can look for the selected program of cannel broadcast customer end B of a sky, if but customer end B with time in customer end A differs a period of time difference scope in selected identical audio and video information, then can be in step s608, check that customer end A is which channel that utilizes in the communication network, such as being the time of reception that receives audio and video information and relevant this audio and video information in the channel 1, just how long customer end A has received this film X, in other words be exactly the time slice " K " that film X has play in channel 1, and can check the time slice " L " that film X does not play as yet.
Then, in step s610, utilize a leading portion that does not use channel 2 to play film X in the communication network, the leading portion audio and video information fragment " K " that customer end A is received in time of reception in channel 1 just, and notify the equipment of customer end B to record the back segment audio and video information fragment " L " that present customer end A is receiving simultaneously, this moment, customer end B can notifiedly need switching channels so far not to use channel 2 to begin to watch the fragment " K " of selected audio and video information.
Please describe its process in detail referring to Fig. 5, when customer end A when utilizing channel 1 to watch a film, watching T0 to T1 (i.e. the 1st film partly during this period of time, the fragment of film X " K " just) after, customer end B also desire selects this film to view and admire, but if also from the beginning this film is watched repeating to send customer end B to, then will waste too many bandwidth at a same film of transmission, so for customer end B, just film is divided into leading portion film (be user A fragment " K " that T0 to T1 was watched in the time) and back segment film (be user A ensuing time T will watch in 1 to T4 time the 2nd, 3,4 part films, fragment " L " just), and the time point after customer end A is entering T1 is when watching back segment filmstrip " L ", then the equipment of customer end B will be recorded the back segment filmstrip of T1 to T4 simultaneously, this moment, video server can utilize one not use channel 2 to repeat to export the leading portion filmstrip " K " of T0 to T1 to use side B, for viewing and admiring immediately.
In step s612, the time that can compare leading portion filmstrip " K " and back segment filmstrip " L ", if " K " is during greater than " L ", in step s614, the fragment " L " that channel 1 is play can be than the Zao end of fragment " K " of channel 2 broadcasts, so the channel 1 that use side A takies can be retracted earlier, equipment at this use side B can be finished the action of recording fragment " L " simultaneously, this moment, channel 2 meetings continued plays clip " K " after fragment " K " plays, channel 2 also can be recovered, the film X playback action of user B end then can be replaced by the fragment of recording in advance in the use side B equipment " L ", though this moment, use side B also watched film, in fact channel 1 is all regained with channel 2.
Otherwise, if the comparative result in step s612 shows fragment " K " and is not more than " L ", then in step s618, channel 2 can be recovered earlier after finishing fragment " K ", this moment, channel 1 was still at plays clip " L ", and the equipment of use side B also continues to record the fragment " L " that channel 1 is play simultaneously; In addition, the film X of the broadcast of use side B comes from channel 2, and after channel 2 was recovered, the equipment of use side B can be called out out the fragment of having recorded " L " broadcast that continues itself, and channel 1 then can be broadcast Bi Yihou fully in filmstrip " L " and reclaim.
Then, example goes on to say the method that the present invention reduces the use of cable TV network bandwidth more than.If in a time difference scope, suppose be behind time point T0 to the T4 time point, there are 4 clients all to select same film to view and admire, then because in the present invention, other client (being customer end B, C, D in this example) is not broadcasted part as yet with first client (being customer end A) and is recorded, export and utilize other channel (being channel 2,3,4) that customer end A has been broadcasted part, so customer end B, part that C, D recorded promptly can not take so-called cable TV network bandwidth.In this example, if adopt the normal transmission method, then in the time of T0 to T7, occupy bandwidth 230400Mbit at most, but (promptly the 1st client accounted for 4 hours, and client successively was respectively 1 hour, 2 hours at most only to occupy 4*60*60* (4+1+2+3)=144000Mbit in the present invention, 3 hours), can save 86400Mbit.
In sum, the invention has the advantages that when other client uses the audio and video information that first client received in the time difference scope after, can continue and use the back segment audio and video information that is stored in its local terminal, so that ahead of time the bandwidth that takies is discharged, reduce the time of client occupied channel, to reduce the use amount of bandwidth, reduce the transmission load of whole video VOD system, in other words, can effectively increase the transmission speed of whole system, more can in the same time, provide identical service quality to give more client in addition.
Claims (18)
1, a kind of VOD method that uses the cable TV network bandwidth that reduces, be applicable to and reduce under the situation of a plurality of clients in one time difference of mutual distance scope, employed bandwidth when receiving an identical audio and video information, be not receive this audio and video information and one second client also begins to receive under the situation of identical this audio and video information and takes place in wherein should the time difference scope in one first client, it is characterized in that this minimizing uses the VOD method of cable TV network bandwidth to comprise:
Judge this second client when differing in this time difference scope, whether selected this identical audio and video information is arranged with this first client;
If this second client with time in this first client differs this time difference scope in selected this identical audio and video information, check then this first client is to utilize which channel to receive this audio and video information and a time of reception;
Utilize one not use channel to export this first client, and record the back segment audio and video information that this first user side is at present receiving simultaneously at this leading portion audio and video information that has received in time of reception; And
After this second client uses this leading portion audio and video information, then continue and use this back segment audio and video information of having recorded.
2, the VOD method of cable TV network bandwidth is used in minimizing as claimed in claim 1, it is characterized in that, can utilize a cable television VOD system to become the system that carries out this VOD method.
3, the VOD method of cable TV network bandwidth is used in minimizing as claimed in claim 1, it is characterized in that, can utilize a computer network-based video VOD system to become the system that carries out this VOD method.
4, the VOD method of cable TV network bandwidth is used in minimizing as claimed in claim 1, it is characterized in that, can utilize a compromise formula video on-demand system to become the system that carries out this VOD method.
5, the VOD method of cable TV network bandwidth is used in minimizing as claimed in claim 1, it is characterized in that, if this second client is not selected this identical audio and video information with this first client in the time in differing this time difference scope, then selected this do not use channel directly to export this audio and video information.
6, the VOD method of cable TV network bandwidth is used in minimizing as claimed in claim 1, it is characterized in that this audio and video information comprises video information and audio-frequency information.
7, the VOD method of cable TV network bandwidth is used in minimizing as claimed in claim 1, more comprises:
List an information index; And
This audio and video information that allows those clients utilize this information index to select desire to receive.
8, a kind of video on-demand system that uses the cable TV network bandwidth that reduces, be applicable to and reduce under the situation of a plurality of clients in one time difference of mutual distance scope, employed bandwidth when receiving same audio and video information, be not receive this audio and video information and one second client also begins to receive under the situation of this audio and video information and takes place in wherein should the time difference scope in one first client, it is characterized in that this minimizing uses the video on-demand system of cable TV network bandwidth to comprise:
Whether one video server in differing this time difference scope, has selected this identical audio and video information in order to the demand of judging those clients;
One playing device is present in each those client, for this selected audio and video information of those clients of output; And
One set-top box is present in each those client and connects this playing device, connects this video server by a communication network simultaneously, and this set-top box comprises a plurality of tuners;
Wherein, under differing situation in this time difference scope, this second client and this first client receive this audio and video information, this included set-top box of this second client can begin to store the back segment audio and video information that this first user side is receiving via one first tuner, this video server also can export a leading portion audio and video information that receives before this first client to this second client via one second tuner once more in this time difference scope simultaneously, this back segment audio and video information that will store exports this playing device to so that this set-top box under this second client after exporting this leading portion audio and video information to this playing device, can continue.
9, the video on-demand system of cable TV network bandwidth is used in minimizing as claimed in claim 8, it is characterized in that this set-top box comprises:
One fen column unit connects this video server by this communication network, comprises those tuners, in order to will be divided into this leading portion audio and video information and this back segment audio and video information via this audio and video information that this communication network transmitted;
One processing unit connects this minute column unit, in order to export this leading portion audio and video information and to store this back segment audio and video information, it is characterized in that, after having transmitted this leading portion audio and video information, can continue to send this stored back segment audio and video information; And
One projection unit connects this processing unit and this playing device, and in order to export this leading portion audio and video information and this back segment audio and video information, either-or is to this playing device.
10, the video on-demand system of cable TV network bandwidth is used in minimizing as claimed in claim 9, it is characterized in that this processing unit comprises:
One storage element connects this minute column unit, in order to store this back segment audio and video information that is transmitted via this first tuner; And
One decoding unit connects this minute column unit, this storage element and this projection unit, in order to this leading portion audio and video information and this back segment audio and video information are decoded, further to export this projection unit to.
11, the video on-demand system of cable TV network bandwidth is used in minimizing as claimed in claim 8, it is characterized in that this playing device can be a television set.
12, the video on-demand system of cable TV network bandwidth is used in minimizing as claimed in claim 8, it is characterized in that this playing device can be a computer system.
13, the video on-demand system of cable TV network bandwidth is used in minimizing as claimed in claim 8, it is characterized in that video on-demand system can be a cable television VOD system.
14, the video on-demand system of cable TV network bandwidth is used in minimizing as claimed in claim 8, it is characterized in that video on-demand system can be a computer network-based video VOD system.
15, the video on-demand system of cable TV network bandwidth is used in minimizing as claimed in claim 8, it is characterized in that, video on-demand system can be a compromise formula video on-demand system.
16, the video on-demand system of cable TV network bandwidth is used in minimizing as claimed in claim 8, it is characterized in that this audio and video information comprises video information and audio-frequency information.
17, the video on-demand system of cable TV network bandwidth is used in minimizing as claimed in claim 8, it is characterized in that this communication network can be an analog network.
18, the video on-demand system of cable TV network bandwidth is used in minimizing as claimed in claim 8, it is characterized in that this communication network can be a digital network.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01136745 CN1414790A (en) | 2001-10-23 | 2001-10-23 | Video frequency program requesting system and method capable of reducing the use of wired television network bandwidth |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01136745 CN1414790A (en) | 2001-10-23 | 2001-10-23 | Video frequency program requesting system and method capable of reducing the use of wired television network bandwidth |
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| CN1414790A true CN1414790A (en) | 2003-04-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108718418A (en) * | 2018-05-31 | 2018-10-30 | 西安万像电子科技有限公司 | A kind of management method and device of transmission link |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108718418A (en) * | 2018-05-31 | 2018-10-30 | 西安万像电子科技有限公司 | A kind of management method and device of transmission link |
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