Classifications

• • 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
  • H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
  • H04N21/4433—Implementing client middleware, e.g. Multimedia Home Platform [MHP]
• • 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]
  • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
  • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
  • H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• • 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
  • H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
  • H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
  • H04N21/43072—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of multiple content streams on the same device
• • 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
  • H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• • 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
  • H04N21/835—Generation of protective data, e.g. certificates
  • H04N21/8358—Generation of protective data, e.g. certificates involving watermark
• • 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
  • H04N21/85—Assembly of content; Generation of multimedia applications
  • H04N21/854—Content authoring
  • H04N21/8543—Content authoring using a description language, e.g. Multimedia and Hypermedia information coding Expert Group [MHEG], eXtensible Markup Language [XML]
• • 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
  • H04N21/85—Assembly of content; Generation of multimedia applications
  • H04N21/854—Content authoring
  • H04N21/8547—Content authoring involving timestamps for synchronizing content
• • 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
  • H04N21/85—Assembly of content; Generation of multimedia applications
  • H04N21/858—Linking data to content, e.g. by linking an URL to a video object, by creating a hotspot

Definitions

• the invention relates to programs enriched by applications, in particular by interactive applications and / or broadcasting applications. It also relates to the associated production and broadcasting systems, in particular interactive digital television.
• Interactive television programs Today there are interactive television programs, but their only content, said interactive content. For example, home banking, the weather channel or kitchen, etc. These are programs dedicated to interactive content, this interactive content occupying the entire screen.
• the program being completely dedicated to interactive content, it is easy to limit its use to only subscribers by encryption for example.
• the encryption key is then provided to subscribers under specified conditions, payment of a subscription for example.
• These programs having only interactive content therefore make it possible to target their users.
• interactive television consists in the enrichment of traditional television, that is to say the passive visualization of a video program, by contextual applications, "enhanced TV" in English.
• the bottom of the screen therefore remains occupied by the video program on which information is added via the decoder. This information allows the user to interact using the decoder remote control. Interactivity then relates to a predefined video sequence or even to a single video image.
• remote control as an interaction interface simplifies the implementation of interactivity for the viewer and reduces costs because there is no need to buy a particular interface, telephone, Internet connection, adapted infrared keyboard. . for example.
• FIG. 1 schematically shows the production and distribution channels of a video program according to the state of the art.
• the production line 100 makes it possible to obtain a video program stored on a cassette 150 transmitted to the broadcasting chain 200.
• a cassette 150 transmitted to the broadcasting chain 200.
• It can for example be a professional video cassette containing the video program to be broadcast commonly called the PAD, that is to say ready to broadcast.
• This PAD 150 cassette is then read by the video cassette player VTR 211 of the broadcasting chain 200 (VTR is the abbreviation for Video Tape Reader).
• the video program is then coded by the video coder 231, it is generally an MPEG 2 coder.
• Multiplexer 240 receives several types of data. It processes the coded video program generated by the video coder 231. But also, for example, IP / MEPG data originating from a server 233 are presented on another input of the multiplexer 240. They can ensure, for example, an Internet connection .
• the output of an EPG 233 generator (EPG is the English abbreviation for Electronic Program Guide or electronic program guide in French) can be coupled to one of the inputs of multiplexer 240.
• VOD Video On Demand
• NVOD Near Video On Demand
• the signals generated by the device 234 are received by the multiplexer 240. For various reasons, it may be desirable to limit access to certain programs.
• a device 236 then generates conditional access data such as, for example, an encryption key associated with these programs.
• the multiplexer can also receive interactive data generated by the module 237 (for example, for interactive channels such as the weather channel %)
• the device for broadcasting interactive applications 235 will search for the interactive application to be broadcast during a period T in a server 215 and transmits it to the multiplexer 240.
• the multiplexer 240 transmits the 'all of these data after processing, in particular segmentation for packet transmission, to the modulator 250 for their broadcasts using at least one transmitting antenna 260.
• the activation of an interactive application reprograms the user's decoder to receive his reaction (programming of the key (s) on the remote control for this interactive application) and possibly send this reaction back to the diffuser 200.
• the activation of the interactive application can then be done manually by the intervention of an operator O at the level of the device for broadcasting interactive applications 235.
• the device for broadcasting interactive applications 235 on the intervention of the operator O transmits to the multiplexer 240 the command for triggering the activation of the interactive application identified by this command.
• the operator O watches the broadcast video program and manually triggers the activation of the interactive application via the broadcast device of interactive applications 235.
• the cost of the interactivity of the program is necessarily high due to the use of an operator O.
• an operator O is not very precise which is disadvantageous for the interactive applications linked to only one video image or very short video sequences.
• Another problem is that the production line 100 normally responsible for the content of the programs does not manage the interactive content of the program in question but only its video content.
• the commands for triggering the broadcast and activating an interactive application of the program are managed by the operator O of the broadcast chain 200.
• One solution proposed in the case where the video program is stored on a professional video cassette 150 consists of writing the trigger commands (called triggers in English) at least activating the interactive applications in the data areas relating to the video.
• the video as well as interactive content is managed by the production chain 100.
• the production chain 100 supplied to the broadcasting chain 200 a PAD cassette 150 on which the overall content of the program is written: both the video and the instants of the interactive applications.
• the equipment handling the PAD 150 cassettes before broadcasting deteriorates the data area relating to the video. Therefore, the trigger commands are removed, at least in part.
• the invention therefore relates to a broadcast program signal comprising primary data for the reproduction of the passive main content of the program and secondary data watermarked in the primary data.
• Secondary data does not affect the reproduction of the main content of primary data.
• This secondary data comprises the commands for triggering at least one application linked to the main content of the primary data.
• secondary data make it possible to control the triggering of applications such as, in particular, the control of one or more parameters for broadcasting said program signal and / or one or more applications linked to said program signal.
• the secondary data allow, for example, the triggering of the dissemination and / or activation of at least one interactive application linked to the main content of the primary data.
• Another object of the invention is a command registration system registering secondary data, allowing the triggering of at least one application, in a program signal comprising at least primary data for the reproduction of the passive main content of the program.
• This order registration system includes:
• a reproduction and editing device 160 coupled to these first second inputs ei and e 2 , said device 160 reproducing the main content of the primary data received on the first input ei, and editing on its output at least one secondary data item making it possible to command the triggering of at least one application linked to the main content of the primary data reproduced at this time according to the predetermined interactivity criteria received on this second input e 2 , - a disp
• - watermarking device 170 receiving the primary data from the first input ei and from the secondary data, and generating a program signal comprising the primary data and the secondary data watermarked into the primary data, said watermarking not altering the reproduction of the main content primary data,
• the predetermined control criteria can be predetermined interactivity criteria
• said reproduction and editing device 160 can edit at its output at least one secondary datum making it possible to control the triggering of the broadcasting and / or the activation of at least one interactive application linked to the main content of the primary data reproduced at this time according to said predetermined interactivity criteria received on this second entry e 2 .
• the invention further provides a production line comprising in series a system for producing a program signal comprising primary data for the reproduction of the passive main content of the program and a command recording system as described above. .
• the invention also relates to a command reading system in a program signal comprising primary data for reproducing the passive main content of the program and at least one secondary data watermarked in the primary data.
• This command reading system 220 comprises:
• a tattoo-reading device 221 reading the secondary data watermarked in the primary data, this secondary data comprises commands for triggering at least one application linked to the main content of the primary data,
• the secondary data transmitted on the output of the command reading system 220 may, in addition, include synchronized triggering commands such as activation and / or or the broadcasting of the interactive applications identified by the triggering commands is synchronized with the reproduction of the primary data in which the secondary data associated with these triggering commands are watermarked.
• the command reading system includes a synchronization device 225 receiving at least the secondary data and generating said synchronized trigger commands.
• a program broadcasting channel includes several devices including at least
• a program signal reading device 211 comprising primary data for reproducing the passive main content of the program and at least one secondary data watermarked in the primary data, a program signal coder 231 coupled to the output of said device to read program signal 211,
• a command reading system 220 according to one of claims 7 or 8 coupled to the output of said program signal reading device 211 and / or to the output of said program signal encoder 231 and to the input of at least any of the devices of said broadcasting chain, the triggering commands generated by the command reading system 220 controlling said device of said broadcasting chain coupled to said command reading system 220, - and / or a server of interactive applications 215, an interactive application broadcasting device 235 coupled to said interactive application server 215,
• a multiplexer 240 coupled at least to the outputs of the program signal coder 231 and to the device for broadcasting interactive applications 235.
• said command reading system 220 is coupled to said interactive application broadcasting device 235, the trigger commands generated by the command reading system 220 controlling the transmission of interactive applications. from said interactive application server 215 to the multiplexer 240 and / or the transmission to the multiplexer 240 of the activation order of one or more interactive applications identified by these triggering commands.
• FIG. 4 a diagram of the reading system according to the invention
• FIG. 5a and 5b schematic representations of the progression of an image and the associated interactive application in the distribution chain according to the invention
• Figure 5a corresponding to the use of an interactive system supporting the sending explicit synchronization messages relating to the time base of the primary signal (in particular the MHP standard)
• FIG. 5b corresponding to an interactive system for which the control of the activation of an interactive application can only be done managing its instant of diffusion in the signal received by the decoder (in particular OpenTV or MediaHighway type systems)
• FIG. 6 a general partial diagram of the broadcast chain of video programs with commands triggering various applications according to the invention.
• the watermarking of the primary data for the reproduction of the passive main content of the program by secondary data allowing the triggering of the diffusion and / or the activation of at least one interactive application linked to the main content of the primary data implements two devices:
• the tattooing device 170 is located in the production chain 100 * and coupled to a reproduction and editing device 160 from which it will receive the secondary data to be tattooed in the primary data as shown in Figure 2.
• the tattoo reading device 221 is located in the broadcasting chain 200 * as shown in FIG. 3. It is connected to a reading device 211 of the interactive program signal on the storage medium 180.
• the tattoo reading device 221 controls, for example, the device for broadcasting interactive applications 235.
• FIG. 2 shows the part of the production chain 100 * of the program dedicated to the implementation of the means necessary for controlling the triggering of the applications, in particular for interactivity, according to the invention.
• the program signal comprising the primary data of the passive main content of the program is, for example, stored on a professional video cassette 150, in particular according to the CCIR standard 601.
• the reproduction and editing device 160 receives this program signal on its first input e-t. It reproduces the main content of the program from primary data. So if the main content of the program is visual, it displays the video image sequence. If it is an audio program, it broadcasts the sound sequence.
• control criteria which are, for example, interactivity criteria. These criteria can be diverse.
• the interactivity criteria are divided into two categories: one associated with the distribution of interactive applications, the other with their activation. These criteria may include methods such as, for example, calculating the range of diffusion of an interactive application according to the range or the instant of its activation (for example, start the diffusion of the interactive application 5s before its activation and stop its diffusion 1 s after its activation), or even associate with a sequence comprising a predetermined object the activation of an interactive application (by object recognition in the reproduced content - image or sound recognition -).
• the reproduction and editing device 160 then identifies the sequence to which must be associated using the recommended method.
• control criteria can also be set manually by an operator O * thanks to an interface whose output is coupled to the input e 2 of the reproduction and editing device. Even if, again, an operator is used, it only intervenes once. Whereas today, for a program released from a single production chain 100, if this program is broadcast by several broadcast channels 200 or several times by the same broadcast chain 200, the intervention of an operator O is required on each broadcast chain 200 and this for each broadcast. Therefore, the overall cost of production is reduced by the intervention of a single operator O *.
• the reproduction and editing device 160 then publishes secondary data which are application trigger commands, in particular commands for triggering the distribution and / or activation of the interactive application associated with the image or the image sequence reproduced.
• Secondary data allowing the trigger (“trigger") includes the index of the interactive application, and possibly a code to determine whether it is a command to trigger the broadcast (start or end of broadcast) or activation if both types of information are produced.
• the first intended for the activation of the interactive application and which are watermarked in the primary data sequences whose passive main content will be supplemented by the interactive application in question.
• the second intended to start the distribution of the interactive application at the time of distribution of the primary data of the image in which this secondary data is watermarked.
• the third intended to stop the diffusion of the interactive application at the moment of diffusion of the primary data of the image in which this secondary data is watermarked.
• a fourth type of secondary data can be envisaged. It is a synchronization message used to identify the start of a video sequence. This message allows the reading device (211, 220) to calculate the time parameters necessary for the synchronization of the secondary data with the primary data.
• Using the second and third type of secondary data automates the process of distributing interactive applications. This saves bandwidth. This is not the case today with the use of schedules for time slots (or scheduling in English) for the distribution of interactive applications made manually. Manual configuration is a source of error and uses very large margins over the broadcast period - several hours - resulting in loss of bandwidth.
• an identifier of the distributor for which the secondary data is intended can be envisaged, in particular for those relating to the triggering of the distribution of interactive application.
• a different broadcast range can be calculated according to the technical characteristics of each broadcast channel 200 *.
• the reproduction and editing device 160 then designs different secondary data according to the destination broadcasting chain 200 * .
• the secondary data edited by this reproduction and editing device 160 are transmitted to a watermarking device 170 (watermark embedder in English).
• This watermarking device 170 also receives the primary data of the program signal, for example stored on the video cassette PAD 150.
• the interactive program signal obtained at the output of the watermarking device 170 comprises the secondary data watermarked in the primary data.
• This watermarking does not alter the reproduction of the passive main content of the primary data. This means, especially in the case of passive video main content, that the viewer does not see the difference between the video image before and after the watermarking. Similarly, the watermarking of a sound sequence must not be audible to the listener of the interactive program.
• the interactive program signal thus obtained by the watermarking device 170 is stored on a support 180 which can again be a professional video cassette PAD.
• a secondary datum can be a word up to 64 bits.
• the lighter the word making up the secondary data the more robust this secondary data will be. Indeed, this allows, for example to write in a single image (video, sound ...) the secondary data several times or the secondary data after coding by an error correcting code.
• 32-bit secondary data can then include 4 bits coding the type of trigger, possibly 4 bits identifying the destination broadcast chain, 16 bits allowing the identification of the interactive application, for example by its index in an interactive application server. This index follows, for example, the format specified by the standard used, in particular the MHP standard.
• FIG. 3 shows the part of the broadcasting chain 200 * for the example of the broadcasting of an interactive program dedicated to the installation of the means necessary for commanding application triggering such as interactivity according to the invention.
• a reading device 211 of the storage medium 180 reads the program signal comprising the primary data and the watermarked secondary data. It transmits this signal to a primary data coder 231, an audio coder if the primary data is audio, a video coder if they are video, etc. Furthermore, it transmits said program signal to a command reading system 220.
• This command reading system 220 is capable of reading the secondary data watermarked in the primary data and of creating an order for controlling the device for broadcasting interactive applications 235.
• This device for broadcasting interactive applications 235 transmitting to the multiplexer 240 on order of the command reading system 220 the interactive application to be broadcast that it will have been searched for in the interactive application server 215 and / or the activation order of this application intended for the decoder of the end user.
• the order prepared by the command reading system 220 includes the identifier of the interactive application given by the secondary data. If it is secondary data for triggering the broadcast, it includes a command intended for the interactive application broadcast device 235 to start or stop the transmission of the identified interactive application from the interactive application server. 215 to multiplexer 240. If it is secondary data for triggering activation, it includes a command intended for the decoder of the end user that the interactive application broadcasting device 235 transmits to the multiplexer 240. It can be envisaged that the commands generated by the command reading system 220 include information so that they cannot be executed. only by a single interactive application broadcasting device 235. This means that these devices 235 are identified by a single value, so that there is a selective processing of the broadcasting or activation commands. In this case, said interactive application broadcasting device 235 transcribes only the commands intended for the decoder of the end user addressable by the broadcasting signal.
• the trigger commands generated by the command reading system 220 are synchronized with the image (sound, video, etc.) or the image sequence formed by the primary data in which the secondary trigger data. at the origin of said order were tattooed. This synchronization is carried out so that the distribution and / or activation of the interactive application identified by the secondary data is synchronized with the reproduction of the passive main content of the primary data in which the secondary data is watermarked.
• This device synchronization 225 is coupled to the second input e of the command reading system 220. On this input, it receives data from which it is able to calculate the delay of the commands for triggering secondary data on the primary data in order to transform these trigger commands to synchronize with primary data.
• this second input e 2 of the command reading system 220 is coupled to the output of the primary data coder 231.
• the synchronization device 225 takes account of the delay induced by the coding carried out by the device 231 on the primary data.
• the tattoo reading device 221 is directly coupled to the output of the program signal reading device 211 because tattoos are generally very sensitive to attacks, in particular to those induced by coders such as the primary data coder 231. But if the watermarking technique is sufficiently resistant (error rate below a given threshold) to attacks by the primary data dissemination chain 211-231, the watermarking device 220 can be coupled in parallel with the data input primary in multiplexer 240. In this case, depending on the format of the signals transmitted to the end user's decoders ("midleware" in English), the synchronization device would not be necessary because the trigger commands obtained by the reading device tattoo would be synchronized. Indeed, different formats of signals transmitted to the decoders of the end user exist. The oldest formats are proprietary formants: OpenTV, MediaHighway ... The most recent: MHP is the DVB standard.
• MHP has a means of image synchronization.
• CORAL product Thai Broadcast & Multimedia
• the trigger commands include the instant in this time base of triggering of the dissemination or activation of the interactive application. This instant corresponds to the instant in this same time base of the image formed by the primary data in which the secondary data were watermarked forming this triggering command.
• FIG. 5a is a representation of the progression of an image and of the associated interactive application in the broadcasting chain according to the invention, corresponding to the use of an interactive system having the possibilities of synchronization of the MHP standard.
• the first curve S211 in bold represents the program signal at the output of the reading device 211. This reading begins at time t 0 and ends at time t n .
• the image In read at time to is the first image of the sequence. It is identified by secondary data carrying a synchronization message. The image is read at time ti.
• the instants t are expressed in a universal time base b u .
• This same program signal after coding by the encoder 231 has undergone a certain delay as is represented on the second curve s 23 ⁇ in bold. It begins at time T 0 and ends at time T n . These instants T are given in the time base specific to the program consisting of the primary data to which the interactive applications in question relate.
• the image li * which corresponds to the coded image h is supplied at the instant Ti * by the coder 231.
• the third curve S22 1 shows the instant t 0 'at which the synchronization datum associated with the first image is read lo of the sequence, and the instant t
• the last line gives the set in a universal time base the instants linked to the image: the instant t
• the triggering command for example activation of the interactive application identified by the secondary data tattooed in the image, includes not only the identifier of the interactive application to be activated, the code controlling the user's decoder final activation, but also the time at which it should be activated.
• the reading device 220 receiving on its input e1 the signal s211 and on its input e2 the signal s231, can easily calculate (tT - to '). that is to say the difference between the instants for reading the secondary data associated respectively with the images l 0 and.
• the reading device immediately sends an activation command to the broadcasting device 235, before the instant of broadcasting of the image 1 * 1 (generally the reading time of the device 220 is good less than the coding time of the device 231).
• Certain interactive systems notably OpenTV or MediaHighway do not have activation commands referring to the time base of the primary data.
• the decoder of the end user receiving this type of signal generally activates the interactive application from reception of the last package including the interactive application. Indeed, the interactive application is segmented and transmitted in packets via the multiplexer 240, the modulator 250 and the antenna 260.
• FIG. 5b is a representation of the progression of an image and of the associated interactive application in the broadcast chain according to the invention, corresponding to broadcast signals of the OpenTV or MediaHighway type.
• the first curve s 2 n in bold represents the program signal at the output of the reading device 211. This reading begins at time t 0 and ends at time t n .
• the image In read at time t 0 is the first image of the sequence and is identified by secondary data carrying a synchronization message.
• the image li is read at the instant t
• the instants t are expressed in a universal time base b u .
• This same program signal after coding by the encoder 231 has undergone a certain delay as shown in the second curve S 231 in bold.
• the image I -, * which corresponds to the coded image is supplied at the instant t t * by the encoder 231.
• the third curve S221 shows the instant t 0 'at which the synchronization data item associated with the first image In of the sequence, and the instant tT at which the watermarked secondary data is read in the primary data of the image li by the watermarking reading device 221.
• the fourth line gives the set in a universal time base the instants linked to the image li: the instant ti for reading, the instant ti * for obtaining the coded image li *, the instant t 1 'for reading the watermarked data in.
• the synchronization device 225 gives the order to the device for broadcasting of interactive applications 235 to transmit to the multiplexer 240 the last packet of the interactive application identified Ai at the time when the coder 231 transmits said image * to the multiplexer 240 as shown by the last curve s 235 .
• the synchronization device 225 calculates the relative delay t 0 * '- to' induced by the encoder 231.
• the synchronization device 225 may include a tattoo reading device which benefits from a priori knowledge secondary data which it seeks to read from the primary data at the output of the encoder 231. Then, when reading at tT secondary data linked to li, the reading device 221 knows when to send, via the module 225, a command of broadcasting the last packet of the application to the device 235, taking into account the delay time introduced by 231 and knowing its own time for reading the secondary information.
• This example of synchronization of secondary data with primary data can also be applied to the MHP standard.
• the possibility of identifying the distribution chain receiving the secondary data makes it possible to envisage orders for broadcasting applications, that is to say distribution conditions. of the program, different for each broadcasting channel.
• the desired coding quality may be different depending on the broadcast chain.
• the invention can be implemented for any recorded program having passive main content and one or more interactive applications, whether video, audio, etc. intended to be broadcast for television, radio, cinema networks. or shows ...
• the interactive program is thus obtained for lower costs than those existing. It is made attractive to the public, in particular because it does not have to take any specific steps (making calls, using a computer keyboard, etc.). It can be beneficial for the producer and / or the distributor. Once this system is available, it becomes very easy for content producers and broadcasters to enrich audio-visual programs, thanks to very interactive applications. simple to create, and sources of direct (via a commission on generated telephone calls) or indirect (via testing before purchasing consumer products, ...) sources of income.

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• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Computer Security & Cryptography (AREA)
• Software Systems (AREA)
• Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
• Television Systems (AREA)
• Circuits Of Receivers In General (AREA)

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• 2001
  • 2001-11-16 FR FR0114857A patent/FR2832580B1/fr not_active Expired - Fee Related
• 2002
  • 2002-11-15 JP JP2003545030A patent/JP2005510145A/ja active Pending
  • 2002-11-15 US US10/494,723 patent/US20050015802A1/en not_active Abandoned
  • 2002-11-15 EP EP02790560A patent/EP1457048A2/de not_active Withdrawn
  • 2002-11-15 WO PCT/FR2002/003921 patent/WO2003043329A2/fr not_active Ceased

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