WO2007087763A1 - Procédé pour modifier le contenu d'un flux de données - Google Patents

Procédé pour modifier le contenu d'un flux de données Download PDF

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Publication number
WO2007087763A1
WO2007087763A1 PCT/DE2006/000150 DE2006000150W WO2007087763A1 WO 2007087763 A1 WO2007087763 A1 WO 2007087763A1 DE 2006000150 W DE2006000150 W DE 2006000150W WO 2007087763 A1 WO2007087763 A1 WO 2007087763A1
Authority
WO
WIPO (PCT)
Prior art keywords
data stream
sound data
messages
image
account
Prior art date
Application number
PCT/DE2006/000150
Other languages
German (de)
English (en)
Inventor
Frank Ryll
Original Assignee
Nokia Siemens Networks Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Siemens Networks Gmbh & Co. Kg filed Critical Nokia Siemens Networks Gmbh & Co. Kg
Priority to PCT/DE2006/000150 priority Critical patent/WO2007087763A1/fr
Publication of WO2007087763A1 publication Critical patent/WO2007087763A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/38—Arrangements for distribution where lower stations, e.g. receivers, interact with the broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/30—Aspects of broadcast communication characterised by the use of a return channel, e.g. for collecting users' opinions, for returning broadcast space/time information or for requesting data

Definitions

  • the invention relates to a method for changing the content of an image or sound data stream to be sent simultaneously to a plurality of receiving devices.
  • Methods are known in which an image data stream or a sound data stream is simultaneously sent to a plurality of receiving devices. Examples of such methods are the transmission of television broadcasts or broadcasts. When broadcasting a television program, an image data stream is simultaneously sent to a plurality of
  • a sound data stream is simultaneously sent to a plurality of broadcast receiving devices.
  • Such methods are also commonly referred to as broadcast methods or multicast methods.
  • the data stream is sent to all receiving devices present in a specific area (eg in a spatial area or in a specific network area).
  • the data stream is sent only to a selection of all receiving devices present in a specific area.
  • the content of the transmitted image or sound data stream can generally not be influenced by the receiving device. Rather, a particular pre-defined program (eg television program or radio program) is often sent to the receiving devices by means of the picture or sound data stream.
  • the object of the invention is to provide a flexible and versatile method with regard to the content of the data stream to be transmitted.
  • This object is achieved according to the invention by a method for changing the content of a video or audio data stream to be simultaneously sent to a plurality of receiving devices, wherein in the method
  • a plurality of users of receiving devices are informed by means of an image or sound data stream sent simultaneously to these receiving devices that the future content of the image or sound data stream can be changed by sending messages to a message processor, Message processor receives the incoming messages,
  • an account amount is reserved in an account which is assigned to the user who has ordered the sending of the respective message
  • the account amounts reserved in the accounts are deducted and at the future time the content of the image or sound data stream is changed, when the number of received messages reaches a first predetermined threshold or when the sum of the on the Accounts reserved account amounts reaches a second predetermined threshold.
  • the messages (which are sent to the message computer, for example, at the instigation of the users of the receiving devices) to be received by the message processor, and that after receipt of each of these messages in an account, a specific one Account amount (eg a cash amount of 1 Euro) is reserved, the account is assigned in each case to the user who has arranged the sending of the respective message.
  • a specific one Account amount eg a cash amount of 1 Euro
  • the account is assigned in each case to the user who has arranged the sending of the respective message.
  • the method can proceed in such a way that the plurality of users of receiving devices are informed by means of the image or sound data stream sent to these receiving devices at the same time that by sending messages over a telecommunication network to a message computer, the future content of the image - or sound data stream can be changed, and the message calculator over the telecommunications network receives the subsequent incoming messages.
  • the messages are transmitted via a telecommunications network to the message computer.
  • a return channel (data return channel) is transmitted by the user of the receiving device is realized while the image or sound data stream represents an outgoing channel (data transmission channel) for transmitting the image data or the sound data to the user of the receiving device.
  • the method may be such that when the number of received messages reaches the first predetermined threshold or when the sum of the account amounts reserved on the accounts reaches the second predetermined threshold, the users of the plurality of receiving devices via the video or audio data stream above be informed that at the time in the future, the content of the image or sound data stream is changed.
  • the users of the receiving devices are advantageously informed that the content of the picture or sound data stream is changed so that they can adjust to the changed situation.
  • the method may be such that when the number of received messages reaches the first predetermined threshold, or when the sum of account amounts reserved on the accounts reaches the second predetermined threshold, no further messages are accepted by the message processor, and the Users of the plurality of receiving devices are informed by means of the image or sound data stream that at the time in the future, the content of the image or sound data stream is changed.
  • the message processor is no longer burdened with the reception of the messages, but can increasingly be used for other tasks (for example, further process sequences with regard to other picture or sound data streams).
  • the method may also be such that when the number of messages received reaches the first predetermined threshold, or when the sum of the account amounts reserved on the accounts reaches the second predetermined threshold, messages continue to be received by the message processor and only after Expiration of a predetermined period of time, which begins upon reaching the first or second threshold, the users of the plurality of
  • Receiving devices are informed by means of the image or sound data stream that at the time in the future, the content of the image or sound data stream is changed.
  • the message processor it is particularly advantageous for the message processor to continue to receive messages for a certain period of time even after the first or second threshold value has been reached, and only then to inform the users that the content of the video or audio data stream is changed.
  • account amounts can advantageously be reserved whose sum is greater than the second threshold value.
  • the content of the image or sound data stream may be changed by eliminating a scheduled broadcast of advertising information about the image or sound stream, or by using a predetermined television or audio stream. transmitted via the picture or sound data stream.
  • the reserved account amounts can be used to compensate for or even overcompensate for the financial loss caused by the missing sending of the advertising information.
  • these users can cause the omission of the sending of the advertising information, provided that these users each reserve an account amount in their account and have them charged later.
  • the users can obtain that a predetermined television or radio broadcast is sent out at the future time.
  • the method may be arranged such that the account amount is reserved on a prepaid account or on a postpaid account of the user.
  • zen used prepaid accounts and postpaid accounts are used to implement the method according to the invention.
  • the method may also be such that, upon receipt of the messages, the sum of the account amounts already reserved on the accounts is repeatedly formed or the number of received messages is determined, and the users of the receiving devices repeatedly use the image or sound data stream for the respective current sum or number can be informed.
  • the users are advantageously informed about the respectively current sum or number during the course of the procedure.
  • further users can be made to initiate the sending of further messages to the message processor if the first threshold or the second threshold has not yet been reached and if these other users wish to change the content of the data stream.
  • the method may be configured such that the reservations are canceled for the account amounts respectively reserved on the accounts, and the content of the image or sound data stream is not changed at the time in the future, if until expiration of a predetermined waiting period the number of received messages does not reach the first predetermined threshold or if, by the expiration of the predetermined waiting period, the sum of the account amounts reserved on the accounts does not reach the second predetermined threshold.
  • the reserved account amounts are advantageously released again (ie the reservations are canceled), so that no burden on users with these account amounts occurs. Furthermore, the action desired by the user (the change of the content of the image or sound data stream) is not performed, that is, the content of the data stream is not changed.
  • the method may be arranged such that the message processor receives messages the transmission of which has been initiated by the users by means of a mobile telephone, a landline telephone or a voice-over-IP telephone.
  • the user can conveniently initiate the sending of the messages, since at least one of these telephones is today often available everywhere.
  • the method can proceed in such a way that the messages used are signaling messages which occur in the case of a user-side call of a predetermined telephone number in the telecommunications network.
  • the method can advantageously be implemented particularly simply because such signaling messages occur anyway in the case of a user-side call to a predetermined telephone number in the telecommunications network. On the part of the message calculator, only these messages need to be recognized.
  • the image or sound data stream can be sent to the receiving devices using a broadcast transmission method or a multicast transmission method.
  • a broadcast transmission method or a multicast transmission method For further explanation of the method according to the invention embodiments are shown in the figures. It is in
  • FIG. 1 shows an embodiment of a method with a radio-based transmission of a television picture data stream
  • FIG. 2 shows an exemplary embodiment of a method with a cable-based transmission of a television picture
  • FIG. 1 schematically shows a first house H1 in which a user of a first receiving device El lives.
  • the first receiving device E1 is a television set with a terrestrial antenna A.
  • the user of the television set El also has three communication terminals KEG1, KEG2 and KEG3.
  • This is a mobile telephone KEG1 A fixed-line telephone KEG2 and a voice-over-IP telephone KEG3 (also known as "SIP telephone") implemented by means of a computer
  • SIP telephone voice-over-IP telephone
  • the telecommunication network KN may be of the telecommunication network KN Telecommunications network KN, for example, to a cable network of a cable TV provider or the Internet act.
  • the news Computer R is able to receive the messages sent by the communication terminals, to count and to carry out certain method steps upon receipt of each of these messages.
  • Derar- term computer R as such are already 'now used in so-called "televoting systems" in the intelligent telephone networks.
  • the message computer R is connected to a discriminator gate unit (discriminator) D and with a payment system (OCS OCS Online Charging System)
  • a control unit S which in turn has a connection to facilities of a television studio ST, is connected to the message computer R.
  • the television studio ST is connected to a transmitting installation SA, which transmits an image and / or sound data stream by means of electromagnetic waves
  • This image and / or sound data stream S1 is received by the antenna A of the first receiving device E1, whereupon the television program is output on a screen of the receiving device E1 so that the user of the receiving device E1 can watch TV ,
  • a second house H2 with a second receiving device E2 and a third house H3 with a third receiving device E3 are shown schematically, in which likewise receiving device users reside.
  • the second receiving device E2 and the third receiving device E3 are also television sets.
  • These receiving devices E2 and E3 are able somnif. Receive sound stream S1 of the transmission SA and output the corresponding television program on their screens.
  • the users of these further receiving devices E2 and E3 also have communication terminals in the form of a telephone (not shown in the figure), with which they can send messages to the message computer R or cause the sending of such messages.
  • the payment system OCS has access to accounts associated with the users of the receiving facilities. Andswei- se has the payment system OCS access to an account Kl, which is associated with the user of the receiving device El. Furthermore, the payment system OCS has access to an account K2, which is assigned to the user of the receiving device E2. Finally, the payment system OCS also has access to an account K3, which is assigned to the user of the receiving device E3.
  • the embodiment is based on the following situation:
  • advertising blocks are included. These advertising blocks (hereinafter referred to as simply "Television") by the operator of the transmission system or the television studios sold to advertising companies.
  • Advertising revenues represent a basis of the business of television shows (especially if it is' a private television station.)
  • the willingness to pay is essentially determined by the attractiveness of the respective television program during which the commercial block is to be run Generally harmful that some viewers at the beginning of an ad block switch the station (also called “zapping”), as these viewers are then not reached by the ad block.
  • the method proceeds as follows: Shortly (eg 5 minutes) before the start of an advertising block, the following text is inserted into the current television program: "If you want to prevent the next commercial break, then please call the telephone number 0180 12345 (cost per call 0.50 cents). As soon as more than € 50,000 has been collected men are the commercial break and the 'broadcast omitted continues without interruption. "This text is sent to the receiving devices El, E2 and E3 off sending image data stream transmitted. simultaneously with the current television program from the transmitter SA by a result, the users of these receivers El, informed 'E2 and E3 that they can be arranged by calling the telephone number 0180 12 345, that the future content of the image data stream is changed. changes in future Switzerland halts the image data stream consists embodiment in that the commercial break is prevented and the running movie is transmitted without interruption.
  • a user of the receiving equipment ie a television viewer
  • the user of the first receiving device E1 calls the telephone number 0180 12345 by means of his mobile telephone KEG1, whereby a corresponding signaling message N1 is sent from the communication terminal KEG1 to the message computer R.
  • the message computer R receives the signaling message Nl.
  • the message processor R so the sender of the message Nl is known.
  • the message processor R then sends an information message identifying the sender of the message N1 to the control unit S, whereupon the control unit S informs the payment system OCS and the discriminator unit D.
  • the payment system OCS determines the account associated with the sender of the message Nl. In the embodiment, these are a so-called "prepaid account""(ie a prepaid Gutha ⁇ benachi) of the user of the first receiver El.
  • a pre-determined amount of account is reserved in this credit account. In the exemplary embodiment 0.50 cents are reserved. Information about the reserved account amount (0.50 cents) is transmitted via the discriminator unit D and the control unit S to the television studio ST, whereupon in the current television program . a text is displayed: "So far, € 0.50 have come together.”.
  • the user of the receiving device E2 sends a message N2 to the message computer R, in that this user calls the telephone number 0180 12345 via his landline telephone.
  • the message calculator R receives them
  • the message is registered and the user of the second receiving device E2 is determined as the sender of the message. Subsequently, the payment system OCS determines the account assigned to this user; in the exemplary embodiment, it is again a prepaid account. Also on this
  • Prepaid account is reserved the amount € 0.50.
  • the discriminator unit D determines that the threshold
  • Message Calculator R does not receive any further messages from users.
  • the information is displayed in the current television program "The next commercial interruption is omitted."
  • the users of the receiving devices El, E2, E3, etc. are thus informed by means of the video or audio data stream.
  • the content of the image data stream is changed, namely that the originally planned commercial interruption is canceled and that the television program continues uninterrupted, and the account amounts reserved on the prepaid accounts are deducted and sent to the operator of the television station transferred.
  • the debited account amounts can be reduced by service fees for the use of the telecommunications network, the message computer R, the discriminator unit D, the payment system OCS and the control unit S; these services Fees are then transferred to the service operator (eg the operator of the telecommunications network KN).
  • Another embodiment of the method may also be such that upon reaching the threshold (50,000 €), a timer unit begins to run which measures a predetermined period of time (for example, this period may be 2 minutes). During this' period takes the message computer R continue to receive messages and advertising accounts amounts to the appropriate accounts re'serviert.
  • a timer unit upon reaching the threshold (50,000 €), a timer unit begins to run which measures a predetermined period of time (for example, this period may be 2 minutes). During this' period takes the message computer R continue to receive messages and advertising accounts amounts to the appropriate accounts re'serviert.
  • the message computer R Only at the expiration of this predetermined period of time (ie at the end of the 2 minutes) the message computer R receives no further messages and the users of the receiving devices are informed by means of the picture or sound data stream that the advertising block is dispensed with. This information can be obtained, for example, by inserting into the current television program the text message "The next ad block is omitted.” After the predetermined period of time has elapsed, in the exemplary embodiment a total of 63.138,50 € on the different prepaid accounts reserved. This amount is then debited from the accounts.
  • the discriminator unit D can also determine (count, sum) the number of received messages N1, N2, etc., and compare the number (sum) with a predetermined threshold value.
  • the number of received messages can also be determined by the message processor or the control unit.
  • the user of the receiving device is informed in this embodiment that the image data stream is changed as soon as 100,000 television viewers have called.
  • the users of the receiving devices are then informed by text messages about the number of received messages during the procedure (eg "5,731 viewers have called so far.")
  • the information can also be given by means of a percentage, eg "So far 79% of the necessary 100,000 spectators called. " or "So far 79% of the necessary viewers have called.”.
  • the transmission of the image or sound data stream via a television transmission system SA is an example of a so-called broadcast transmission method.
  • the audio or audio data stream can also be sent by means of a so-called multicast transmission method, for example by means of the method "Multimedia Broadcast Multicast Service (MBMS)."
  • MBMS Multimedia Broadcast Multicast Service
  • the messages N1, N2 etc. are signaling messages which are included in the exemplary embodiment the call of the respective user at the predetermined telephone number
  • 0180 12345 are transmitted from the telephone over the telephone network KN to the message processor R.
  • the user does not need to speak a word.
  • the message calculator R receives the message and recognizes the user without Voice data from the respective phone to the message computer R need to be transferred.
  • the waiting period may be, for example, 5 minutes
  • the number of received messages does not reach the first threshold (100,000 callers)
  • the sum of the account amounts reserved on the pre-paid accounts exceeds the second threshold 50,000 € is not reached
  • the account amounts already reserved in the accounts are released again (ie the reservations are canceled / deleted) and the content of the image or sound data stream is not changed (ie the film being broadcast is interrupted and the next commercial block becomes sent as originally planned).
  • Information about the current and future television program is stored in the control unit S, so that the method described can begin in each case a certain time (eg 5 minutes) before the start of the next commercial interruption.
  • the data of the calling television viewers and their number are transmitted to the discriminator unit D, for example.
  • the discriminator unit D can be designed as an independent unit, but it can also be a component of the payment system OCS. As soon as the discriminator unit ascertains that the corresponding threshold value has been reached, it sends a corresponding message to the message processor R, so that the latter no longer accepts further calls. Alternatively, the discriminator unit ensures that the measurement of the predetermined period of time is started during which messages continue to be received by the message processor.
  • so-called postpaid accounts can also be used as accounts.
  • the image or sound data stream can also be changed by sending a predetermined television or radio broadcast by means of the data stream at the time in the future.
  • a program can be, for example, a successful film.
  • FIG. 2 shows a further exemplary embodiment.
  • This exemplary embodiment differs from the exemplary embodiment explained with reference to FIG. 1 in that the television studio ST has a video transmission device which has a sound data stream and / or an image data stream S2 (for example films) to the reception devices E1, E2, via line-connected paths. E3 etc. transmits.
  • the television studio ST has a video transmission device which has a sound data stream and / or an image data stream S2 (for example films) to the reception devices E1, E2, via line-connected paths. E3 etc. transmits.
  • the embodiment illustrated in FIG. 2 is based on the following situation:
  • the user of the receiving device El wants to watch a movie on his home TV El. He knows that this film is offered through a video-on-demand communication service, the video-on-demand communication service is a service that orders a special movie exclusively for one user (here the users) the receiving device El) provides. This service is a so-called point-to-point transmission.
  • a transmission of a film by means of the video service "video-on-demand" is complex both on the part of the sender and on the part of the communication network used for the transmission of the data stream, therefore, a video-on-demand film transmission is also comparatively For example, it costs $ 5 per movie, so video-on-demand service provider revenue is determined by the price per movie ($ 5) and the number of viewers who request the movie This reduces the cost of the video-on-demand service provider to a comparatively high level (compared to a normal TV broadcast) and reduces the relatively large amount of device power required on the sender side and on the transmission network side Advantage, if he managed to find a majority of viewers who watch a particular movie want to see one and the same time.
  • FIG. 2 The process running to this end is shown in FIG. 2 and is similar to the method described in connection with FIG. In the following, only the essential differences will be described.
  • the majority of users of the receiving devices El, E2, E3, etc. are informed in the context of the television program by means of an image data stream S2 sent simultaneously to these receiving devices that they have the option of future content of the image Data stream S2 to change.
  • the process then proceeds as explained in FIG.
  • the message calculator R recognizes the caller.
  • the calls are then registered and counted.
  • An account amount is reserved in the accounts of the respective callers.
  • the threshold eg 10,000 spectators
  • the reserved account amounts are debited and the viewers are informed via a text message displayed in the television program that the film "The Feuerzangenbowle" will be broadcast on 29.02.2006 at 20:15.
  • the film "Die Feuerzangenbowle” will be broadcasted using the image / sound data stream S2.
  • the film can also be transmitted via a so-called point-to-multipoint transmission, so that only those users can see through their receiving facilities the movie, which have actually called the news computer R.
  • the movie data could also be transmitted encrypted.
  • the method described in FIG. 2 may alternatively be modified in such a way that several films, radio plays, songs or the like are offered for selection for a future date. It will then be the. Film (or audio play, piece of music, etc.) for which the corresponding threshold is reached first. Only the accounts of those viewers are debited (ie only from these accounts - the reserved account amounts are deducted) which have called for the film actually to be broadcast ("winning film”) The callers for the other films are not charged the accounts and the Reservations are canceled (ie the reservations are released or deleted).
  • the described methods have a number of advantages.
  • the inventive method allow an optimization of the broadcasting of television broadcasts, in which both the operator of the television station and the operator of the telecommunications network can benefit.
  • the operator of the television station is given the opportunity to have the revenue he receives from advertising companies for a commercial block overbought by a large number of viewers. If the number of interested viewers reaches the respective threshold, or if those reserved in the accounts of the interested viewers
  • the attractiveness of the broadcasts of the television studios and Hör ⁇ funkstudios is increased because the broadcasts are not interrupted by frequent advertising blocks or get the viewer instead of the predetermined regular program of their preferred broadcasts offered.
  • For the operator of the telecommunications network there is the possibility to offer an att ⁇ raktive service and thus not only to generate additional phone calls and better utilize the telecommunications network, but also to receive fees for the service.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne un procédé pour modifier le contenu d'un flux de données audio ou vidéo à envoyer simultanément à une pluralité de dispositifs de réception. Selon ce procédé, une pluralité d'utilisateurs de dispositifs de réception (E1, E2, E3) sont informés au moyen d'un flux de données vidéo ou audio envoyé simultanément à ces dispositifs de réception (S1, S2) sur le fait que, par envoi de messages (N1, N2, N3) à un processeur de messages (R), le contenu futur du flux de données audio ou vidéo peut être modifié. Le processeur de messages reçoit les messages entrants subséquemment. A la réception d'un message, un montant est réservé sur un compte (K1, K2, K3). Chaque montant réservé sur les comptes est déduit et le contenu du flux de données audio ou vidéo est modifié si le nombre des messages reçus atteint une première valeur seuil prédéfinie ou si la somme des montants réservés sur les comptes atteint une seconde valeur seuil prédéfinie.
PCT/DE2006/000150 2006-01-31 2006-01-31 Procédé pour modifier le contenu d'un flux de données WO2007087763A1 (fr)

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PCT/DE2006/000150 WO2007087763A1 (fr) 2006-01-31 2006-01-31 Procédé pour modifier le contenu d'un flux de données

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PCT/DE2006/000150 WO2007087763A1 (fr) 2006-01-31 2006-01-31 Procédé pour modifier le contenu d'un flux de données

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2271096A1 (fr) * 2008-03-28 2011-01-05 NEC Corporation Système de diffusion, dispositif de gestion de diffusion, procédé de diffusion et terminal

Citations (5)

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Publication number Priority date Publication date Assignee Title
US5351075A (en) * 1990-03-20 1994-09-27 Frederick Herz Home video club television broadcasting system
US20020194607A1 (en) * 2001-06-15 2002-12-19 Connelly Jay H. Method and apparatus for periodically delivering an optimal batch broadcast schedule based on distributed client feedback
US20030088778A1 (en) * 2001-10-10 2003-05-08 Markus Lindqvist Datacast distribution system
US20050120389A1 (en) * 2003-12-01 2005-06-02 International Business Machines Corporation Selecting divergent storylines using branching techniques
US6918131B1 (en) * 2000-07-10 2005-07-12 Nokia Corporation Systems and methods for characterizing television preferences over a wireless network

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5351075A (en) * 1990-03-20 1994-09-27 Frederick Herz Home video club television broadcasting system
US6918131B1 (en) * 2000-07-10 2005-07-12 Nokia Corporation Systems and methods for characterizing television preferences over a wireless network
US20020194607A1 (en) * 2001-06-15 2002-12-19 Connelly Jay H. Method and apparatus for periodically delivering an optimal batch broadcast schedule based on distributed client feedback
US20030088778A1 (en) * 2001-10-10 2003-05-08 Markus Lindqvist Datacast distribution system
US20050120389A1 (en) * 2003-12-01 2005-06-02 International Business Machines Corporation Selecting divergent storylines using branching techniques

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2271096A1 (fr) * 2008-03-28 2011-01-05 NEC Corporation Système de diffusion, dispositif de gestion de diffusion, procédé de diffusion et terminal
EP2271096A4 (fr) * 2008-03-28 2012-10-31 Nec Corp Système de diffusion, dispositif de gestion de diffusion, procédé de diffusion et terminal
US8576735B2 (en) 2008-03-28 2013-11-05 Nec Corporation Broadcast system, broadcast management device, broadcast method, and terminal

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