JP3708209B2 - Data distribution apparatus and data distribution method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a data distribution apparatus and a data distribution method, and is particularly suitable for application to a case where stream data having the same content is distributed to a plurality of users.
[0002]
[Prior art]
In recent years, with the spread of CATV (Cable Television), a video on demand (VOD) service has been provided.
[0003]
In response to a request transmitted from a terminal device called a set top box (STB) installed in a home, a video-on-demand is received from a CATV center that stores videos of a plurality of titles. The requested video data is transmitted to the requesting home.
[0004]
Video on demand includes full video on demand (FVOD) and near video on demand (NVOD).
[0005]
Full video on demand is a service form that allows viewers to watch the requested video immediately when they request the video they want to watch. In response to the viewer's request, the requested video is immediately Aired. In addition, viewers can occupy and watch one video program, and in the same way as VTRs and video discs installed in the home, not only video playback but also fast forward, rewind, pause, etc. Is also possible. In order to realize such a function, in full video on demand, each viewer uses a dedicated channel individually.
[0006]
On the other hand, near video on demand is also referred to as a time shift service, and is a service form in which a single video program is broadcast using a plurality of channels at fixed time intervals while shifting the time.
[0007]
For example, as shown in FIG. 9, streams 90 to 93 for 120 channels are used, and a 2-hour video program is transmitted at 1-minute intervals. This allows the viewer to watch the desired video program from the beginning whenever he or she waits up to 1 minute.
[0008]
As described above, in a media server system having an interactive function, a specific content with particularly high demand is limited to a mode in which a plurality of viewers simultaneously view the streams 90 to 93 having the same contents. Thus, the streams 90 to 93 that need to be transmitted at the same time are aggregated, and more viewing is possible with a small stream transmission capability.
[0009]
[Problems to be solved by the invention]
However, in the conventional near video on demand, the same content (program or title) is sent in separate streams 90 to 93 one after another by shifting several minutes to several tens of minutes. , Had to wait until the next stream 90-93 was sent out.
[0010]
For this reason, in order to increase the satisfaction of the viewer, it is necessary to shorten the transmission interval for sending the streams 90 to 93. Therefore, there is a problem that the number of simultaneously flowing streams increases and the load on the media server increases. there were.
[0011]
Therefore, an object of the present invention is to reduce the load on the media server while maintaining a transmission interval when a program having the same content is transmitted as a separate stream at different times.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problem, according to the present invention, as shown in FIG. 1, for example, in the near video on demand, the time T ₁ After starting the reproduction of the first data, the reproduction time T ₂ The first reproduction means 11a for inserting the second data having the above and reproducing the second data, and the time T ₁ To playback time T ₂ After the elapse of time, the second reproduction means 11b for starting reproduction of the first data and the reproduction data of the first reproduction means 11a are supplied to the first reception means 14a, and the reproduction of the second reproduction means 11b is performed. After the switching means 12 for supplying data to the second receiving means 14b and the first reproducing means 11a finish the reproduction of the second data, the reproduction data of the second reproducing means 11b is transferred to the first receiving means 14a. And control means 13 for performing control to be supplied to both the first receiving means 14b and the second receiving means 14b.
[0013]
For this reason, at the first receiving means 14a, the time T ₁ The first data is started to be reproduced, and the second receiving means 14b receives the time T. ₁ To playback time T ₂ Since the reproduction of the first data is started after the elapse of time, the viewer of the second receiving means 14b ₁ Playback time T at the maximum limit even after elapse of ₂ By waiting, the first data can be viewed from the beginning.
[0014]
In the first reproduction means 11a, after the reproduction of the first data is started, the reproduction of the second data is performed for the reproduction time T. ₂ When the reproduction of the second data is completed, the reproduction point of the first data by the first reproduction unit 11a coincides with the reproduction point of the first data by the second reproduction unit 11b.
[0015]
After the reproduction times of the first data coincide with each other, the control means 13 controls the switching means 12 so that the reproduction data of the second reproduction means 11b is added to the second reception means 14b and the first reception means 14a. Also be supplied to.
[0016]
Thus, even when the reproduction of the first data of the first reproduction means 11a is stopped after the reproduction time points of the first data coincide with each other, the first reception means 14a and the second reception means 14b can 1 data is normally supplied, and the load on the first reproducing means 11a can be reduced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
A data distribution apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
[0018]
FIG. 2 is a block diagram showing a configuration of a data distribution apparatus according to an embodiment of the present invention.
In FIG. 2, 20 is a media server, 21a to 21e are stream playback units, 22 is a stream changeover switch unit, 23a and 23b are stream control units, 24 and 25 are network interfaces, 26 is a distribution network, and 27 is a service selection operation instruction. A transmission network, 28a to 28d are stream service reception units, 29a to 29d are service selection operation units, and 40a to 40d are service reception side devices.
[0019]
The media server 20 includes stream playback units 21a to 21e, a stream changeover switch unit 22, stream control units 23a and 23b, and network interfaces 24 and 25, and provides a continuous media service to viewers via a distribution network 26.
[0020]
The stream playback units 21 a to 21 e read out the program or title from the storage device that stores the continuous media data so as to prevent transmission disturbance, adjust the shape, and send the continuous media data to the stream changeover switch unit 22.
[0021]
The stream changeover switch unit 22 has a switch function and a cross-connect function for switching the connection between the stream reproduction units 21a to 21e and the stream service reception units 28a to 28d.
[0022]
The stream control units 23a and 23b control the stream reproduction units 21a to 21e and the stream changeover switch unit 22 in response to a request from the viewer. For example, in response to a request from the service selection operation unit 29a to 29d or the like, a distribution path between the stream service receiving unit 28a to 28d is secured in the stream changeover switch unit 22 or the distribution network 26, or the stream reproduction units 21a to 21e are set. Or assign.
[0023]
For example, as shown in FIG. 3, the stream control units 23a and 23b include a network control unit 31, a content management unit 32, an operation management unit 33, a charging function unit 34, and a user in addition to the stream control unit 30 in a narrow sense. A management unit 35 and the like are also included.
[0024]
The network interfaces 24 and 25 perform data format conversion.
The distribution network 26 is a communication device for transmitting data transmitted from the stream reproduction units 21a to 21e to the stream service reception units 28a to 28d. In the case of a wide area service, a telephone line, satellite broadcasting, or the like is used.
[0025]
For example, as shown in FIG. 4, the distribution network 26 recognizes the service receiving side devices 40 a to 40 d and the media server 20 in addition to the transmission path for transmitting signals and the exchanges 41 and 42, and performs a mediation 43. Is included. The service reception side devices 40a to 40d are composed of stream service reception units 28a to 28d and service selection operation units 29a to 29d.
[0026]
The service selection operation instruction transmission network 27 is used when the distribution network 26 uses satellite broadcasting or the like and only one-way communication from the stream reproduction units 21a to 21e to the stream service reception units 28a to 28d is performed. Information indicated by the service selection operation units 29a to 29d is transmitted to the stream control units 23a and 23b. As the service selection operation instruction transmission network 27, a telephone line or the like is used.
[0027]
The stream service reception units 28a to 28d display or reproduce the data sent from the stream reproduction units 21a to 21e as audio or video that can be viewed by the viewer.
[0028]
The service selection operation units 29a to 29d are for the viewer to select which program to watch from among the programs (programs or titles) prepared in the media server 20.
[0029]
Next, the operation of the data distribution apparatus according to an embodiment of the present invention will be described with reference to the drawings.
For example, as shown in FIG. 5, the stream playback units 21a to 21e use 120 channels and send out video programs having the same contents for 2 hours at intervals of 1 minute. Here, for example, 1-minute waiting sections 50 and 52 are inserted in the middle of the odd-numbered channel streams 51a and 53a. In the waiting sections 50 and 52, for example, commercials are inserted.
[0030]
Then, after the waiting sections 50 and 52 are reproduced, the streams 51a and 53a of the odd-numbered channel are merged with the streams 51b and 53b of the even-numbered channel sent immediately after that, so that a necessary stream is obtained. 51a, 53a, 51b, 53b can be reduced in half from the middle.
[0031]
For example, the waiting sections 50 and 52 are inserted 9 minutes after the reproduction start time of the odd-numbered channel streams 51a and 53a, and merged with the even-numbered channel streams 51b and 53b immediately after the reproduction of the waiting sections 50 and 52 is completed. In such a case, the odd-numbered channels after the merging can be reused in other channels, so that the odd-numbered channels required for transmission can be reduced from 60 channels to 10 channels. For this reason, in practice, it is possible to transmit a video program having the same contents for 2 hours at intervals of 1 minute only by using 70 channels.
[0032]
The waiting sections 50 and 52 are reproduced by inserting the waiting sections 50 and 52 in advance into the streams 51a and 53a to be waited on and reproducing the streams 51a and 53a in which the waiting sections 50 and 52 are inserted. Alternatively, the stream playback switches 21a to 21e may be switched by the stream switching switch unit 22. In the former case, for example, the waiting sections 50 and 52 are continuously stored on the video tape in the middle of the streams 51a and 53a to be waiting, and this video tape is reproduced.
[0033]
The end of playback in the waiting sections 50 and 52 may be detected by providing a playback position detection mechanism in the stream playback units 21a to 21e and detecting the playback position in the waiting sections 50 and 52 using this playback position detection mechanism. Alternatively, the stream control units 23a and 23b may be provided with a clocking function, and the clocking function may be used to clock the playback time of the waiting sections 50 and 52.
[0034]
When the end of reproduction in the waiting sections 50 and 52 is detected, the stream control units 23a and 23b issue instructions to the stream switching switch unit 22, the distribution network 26, and the stream service receiving units 28a to 28d, and the waiting section 50 , 52 are switched to the merged streams 51b and 53b.
[0035]
As a result, the streams 51a and 53a for which the reproduction of the waiting sections 50 and 52 has been completed do not require subsequent transmission, and the load necessary for this transmission is not applied to the stream reproduction units 21a to 21e. 21e can share the transmission of another stream.
[0036]
FIG. 6 is a flowchart showing the operation of the stream controllers 23a and 23b. As shown in FIG. 5, this flow chart uses 120 channels, sends a video program of the same content for 2 hours at an interval of 1 minute, and 1 minute after 9 minutes from the start of playback of the stream of the odd-numbered channel. A case where a waiting section is inserted will be described.
[0037]
In FIG. 6, first, as shown in step S <b> 1, for example, the service user turns on the service receiving device 40 a and waits for connection.
Next, as shown in step S2, the gateway 43 is notified that the service receiving side apparatus 40a is turned on, and receives a network connection request from the gateway 43 to perform connection processing.
[0038]
Next, as shown in step S3, identification of the service receiving side device 40a and a request for a password are performed, and their contents are inspected to check the user's registration qualification. And if it is inspection NG, it will progress to step S4 and will cut | disconnect the service receiving side apparatus 40a, and if it is inspection OK, it will progress to step S5.
[0039]
Next, as shown in step S5, information necessary for receiving a service from the gateway 43 is sent to the service receiving side apparatus 40a. The service receiving side device 40a obtains the list information of the servers on the network held by the gateway 43, and displays the initial menu so that the service user can see it on the screen.
[0040]
As the server list information, for example, servers such as near video on demand, full video on demand, and online shopping are displayed. Of these, the near video on demand media server 20 is automatically set. Or select manually.
[0041]
Next, as shown in step S6, the gateway 43 receives the name, symbol or number of the media server 20 sent from the service receiving side device 40a, and uses the function of the distribution network 26 to connect the media server 20 and the service. A path for transferring data to and from the receiving device 40a is secured.
[0042]
The stream control units 23a and 23b of the media server 20 include a function of recognizing the service receiving side device 40a, collecting charges, and communicating with the gateway 43 to secure a path for data transfer.
[0043]
When the network controller 31 is notified of the connection from the gateway 43 and a route is secured, information on the connected service receiving device 40a is transmitted to the user management unit 35. The user management unit 35 requests the user or device identification information and password from the service receiving side device 40a, and confirms the usage qualification and billing destination. This information is transmitted to the billing function unit 34, and the status of service provision thereafter is traced for the service receiving side device 40a.
[0044]
In addition, the user management unit 35 obtains the current service menu from the content management unit 32 and sends a menu corresponding to the usage qualification to the service receiving side device 40a. At this time, if the menu itself is a video, the stream that sends the video of the menu is assigned to the service receiving device 40a by instructing the stream control unit 30 in a narrow sense. As a result, a moving image menu is displayed on the screen of the service receiving device 40a.
[0045]
The service receiving side device 40a requests a specific video from the stream control units 23a and 23b based on the menu information that is not a moving image, and as a result, sends a moving image menu by the function of the stream control unit 30 in a narrow sense. It may be.
[0046]
When the service list provided by the media server 20 is displayed as a menu on the stream service receiving unit 28a, the viewer selects a program to be viewed using the service selection operation unit 29a. The selected content is transmitted to the user management unit 34 via the distribution network 26, and a stream transmission examination command is issued to the stream control unit 30 in a narrow sense.
[0047]
Next, as shown in step S7, it is determined whether or not it is finished. If it is finished, the process proceeds to step S8 to switch to the connection of the gateway 43. If not finished, the process proceeds to step S9.
[0048]
Next, as shown in step S9, the stream control unit 30 in a narrow sense grasps in what schedule the program such as the selected movie is transmitted, and receives the program such as the selected movie on the service receiving side. Find the best stream to broadcast on device 40a.
[0049]
Next, as shown in step S10, the stream control unit 30 in a narrow sense sends a waiting time required until the start of viewing of the program selected by the service receiving side device 40a to the user management unit 34, and the distribution network 26 is sent to the user management unit 34. Via the stream service receiver 28a. When a reply of consent is sent from the service receiving side device 40a to the user management unit 34, the stream control unit 30 in a narrow sense is instructed to allocate a stream to the service receiving side device 40a.
[0050]
Here, when there are few viewers and the stream of the program selected by the service receiving apparatus 40a is not flowing, the stream control unit 30 in the narrow sense uses the usage status of the stream playback units 21a to 21e and the stream switching switch unit 22. In consideration of the congestion status, which stream playback unit 21a to 21e is selected from among the plurality of stream playback units 21a to 21e, which route of the stream changeover switch unit 22 is used, and the like are calculated.
[0051]
On the other hand, when a reply of rejection is sent from the service receiving device 40a to the user management unit 34, the process proceeds to step S11, and the service receiving device 40a is disconnected.
Next, as shown in step S12, the process waits until the viewing start time is reached.
[0052]
Next, as shown in step S13, at the time when the viewing start time is reached, the narrow stream control unit 30 issues a command to the stream playback units 21a to 21e and the stream changeover switch unit 22, and commands the determined resources. The stream is sent to the service receiving apparatus 40a by these resources.
[0053]
Next, as shown in step S14, it is checked whether the assigned stream is an odd number or an even number. If the assigned stream is an even number, the process proceeds to step S15, waits for 120 minutes, and goes to step S5. Return. That is, the selected 120-minute program is broadcast as it is on the service receiving apparatus 40a.
[0054]
On the other hand, if the assigned stream is an odd number, the process proceeds to step S16 and waits for 10 minutes. At this time, the stream control unit 30 in a narrow sense knows that there are a total of 70 program streams selected by the service receiving device 40a. Here, the number of the program stream aired by the service receiving side apparatus 40a is, for example, No. 1, and when the program for 9 minutes is broadcasted in this first stream, a 1-minute commercial is received. Flowing. Then, when it is close to 10 minutes, the narrowly-defined stream control unit 30 starts preparation for switching to match the transmission content of the first stream with the transmission content of the second stream.
[0055]
Next, as shown in step S17, when 10 minutes have passed since the transmission of the first stream, a command is issued to the stream reproducing units 21a to 21e, the stream changeover switch unit 22, the distribution network 26, and the service receiving side device 40a. Then, the stream of the program broadcasted by the service receiving apparatus 40a is switched to the second stream. That is, the route to the service receiving device 40a is changed so that the second stream flows into the route to the service receiving device 40a.
[0056]
The stream reproducing units 21a to 21e, based on a command from the stream control unit 30 in a narrow sense, transmit again from the top as the 11th stream after the transmission of the 1st stream is completed.
[0057]
The stream changeover switch unit 22 is based on a command from the stream control unit 30 in a narrow sense, and the service reception side device 40b whose path is commonly connected to the outlet of the stream changeover switch unit 22 used by the service reception side device 40a. When there are ˜40d, the service receiving side devices 40b-40d are simultaneously switched.
[0058]
When there are service receiving devices 40b to 40d that have been viewing the same stream as the service receiving device 40a based on a command from the stream control unit 30 in a narrow sense, the distribution network 26 has these service receiving devices 40b. At the same time, switching is performed for .about.40d.
[0059]
The service receiving side device 40a is based on a command from the stream control unit 30 in a narrow sense when all 70 videos are streamed in common to the stream service receiving units 28a to 28d, such as CATV. Then, one to be broadcasted by the service receiving side device 40a is selected from among the 70 videos and switched.
[0060]
Next, as shown in step S18, it waits for 110 minutes. That is, the remaining 110 minutes of the 120-minute program selected by the service receiving side apparatus 40a is broadcast by the second stream.
[0061]
When the viewing ends, processing such as billing is performed, and the process returns to step S5 and the initial menu is displayed again on the service receiving side device 40a. Then, the user disconnects or returns to the screen displayed by the gateway 43 to select another server.
[0062]
In the above-described embodiment, the stream changeover switch unit 22 and the network interface 24 may be omitted.
As described above, according to one embodiment of the present invention, the media server 20 having any number of stream playback units 21a to 21e, any number of stream changeover switch units 22 and stream control units 23a and 23b, Service reception side devices 40a to 40d having stream service reception units 28a to 28d and service selection operation units 29a to 29d, distribution network 26 for connecting the media server 20 and service reception side devices 40a to 40d, and service selection operation instruction transmission In the media stream system including the network 27, in addition to the contents of the service to be distributed, the waiting time sections 50 and 52 for performing time adjustment are selectively inserted according to the streams 51a, 51b, 53a and 53b, Or send pre-inserted one The stream changeover switch is switched to a service having the same content as that of the other streams 51b and 53b started to be transmitted at different times after the streams 51a and 53a started to be transmitted at the predetermined time have passed through the waiting time sections 50 and 52, respectively. The switching function of the unit 22, the distribution network 26, or the service receiving side devices 40a to 40d enables the service to be continued by replacing the received stream contents so that different stream service receiving units 28a to 28d receive the same stream. Thus, the stream transmission capability of the media server 20 can be saved, or the stream reception demand from more stream service reception units 28a to 28d can be met.
[0063]
In this way, by providing a waiting section for a part of the streams, it becomes possible to join with a stream that does not have a waiting section, and the stream that has been waiting needs a stream transmission capability after the end of the waiting. Therefore, the number of simultaneous viewers of services provided by the media stream system can be increased.
[0064]
As mentioned above, although one Example of this invention was described, this invention is not limited to the Example mentioned above, Various other changes are possible.
For example, although FIG. 5 shows a case where one-stage merging is performed, a plurality of stages of merging may be performed.
[0065]
For example, as shown in FIG. 7, the waiting sections 70a and 72a are provided in the first stream 71a and 73a, and the waiting sections 70b and 72b are provided in the second stream 71b and 73b. Then, after the waiting sections 70a and 72a are completed, the first-stage streams 71a and 73a are merged with the second-stage streams 71b and 73b, and after the waiting sections 70b and 72b are completed, 73b may be merged with the third stream 71c, 73c.
[0066]
By performing this multi-stage merging, the load on the stream transmission capability can be further reduced.
In the embodiment of FIG. 5, the case where the streams 51 a and 53 a in which the waiting sections 50 and 52 are inserted is merged with the streams 51 b and 53 b in which the waiting sections 50 and 52 are not inserted is shown in FIG. 8. As shown, the streams 51b and 53b in which the waiting sections 50 and 52 are not inserted may be merged into the streams 51a and 53a in which the waiting sections 50 and 52 are inserted.
[0067]
【The invention's effect】
As described above, according to the present invention, after the transmission of the previous transmission data, the reproduction of the previous transmission data is waited until the reproduction time of the subsequent transmission data coincides, By merging the transmission data, it is possible to reduce the load necessary for data transmission while maintaining the transmission interval between the previous transmission data and the subsequent transmission data.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a data distribution apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration of a data distribution apparatus according to an embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration of a stream control unit in FIG. 2;
4 is a block diagram showing a configuration of the distribution network of FIG. 2. FIG.
FIG. 5 is a diagram showing a flow of stream data according to the first embodiment of the present invention.
FIG. 6 is a flowchart showing an operation of the data distribution apparatus according to the embodiment of the present invention.
FIG. 7 is a diagram showing a flow of stream data according to the second embodiment of the present invention.
FIG. 8 is a diagram showing a flow of stream data according to the third embodiment of the present invention.
FIG. 9 is a diagram illustrating a flow of stream data in a conventional data distribution apparatus.
[Explanation of symbols]
11a First reproducing means
11b Second reproducing means
12 Switching means
13 Control means
14a First receiving means
14b Second receiving means
20 Media server
21a to 21e Stream playback unit
22 Stream selector switch
23a, 23b Stream control unit
24, 25 Network interface
26 Distribution network
27 Service selection operation instruction transmission network
28a to 28d Stream service receiver
29a to 29d Service selection operation unit
30 Narrowly defined stream control unit
31 Network controller
32 Content Management Department
33 Operation Management Department
34 Billing function section
35 User Management Department
40 Service receiving device
41, 42 switch
43 Gateway
50, 52, 70a, 70b, 72a, 72b Meeting section
51a, 51b, 53a, 53b, 71a-71c, 73a-73c stream

Claims (10)

  First reproduction means for starting reproduction of the first data at a predetermined time, inserting second data having a predetermined reproduction time, and reproducing the second data; and from the predetermined time After the predetermined reproduction time has elapsed, the second reproduction means for starting reproduction of the first data, and reproduction data of the first reproduction means are supplied to the first reception means, and the second reproduction means Switching means for supplying the reproduction data of the reproduction means to the second receiving means, and after the first reproduction means finishes reproducing the second data, the reproduction data of the second reproduction means is changed to the first reproduction means. A data distribution apparatus comprising: control means for performing switching control to be supplied to both the receiving means and the second receiving means.   The first reproduction means further performs reproduction of the first data after completion of reproduction of the second data, and the control means performs completion of reproduction of the first data by the first reproduction means. The data distribution apparatus according to claim 1, wherein the switching control is performed simultaneously.   The data distribution apparatus according to claim 1, wherein the first data is continuous media stream data.   The control means includes time measuring means for measuring an elapsed time from when the first reproduction means starts reproduction of the first data to when the second data reproduction ends, and the time measurement means comprises: 2. The data distribution apparatus according to claim 1, wherein the switching control is performed when the elapsed time is measured.   The said 2nd data is provided with the end data which shows the end at the end of the said 2nd data, The said control means performs the said switching control at the time of detecting the said end data. The data distribution apparatus described.   2. The first data and the second data reproduced by the first reproducing means are continuously recorded on the same storage medium in near video on demand. The data distribution apparatus described.   By first reproduction means for starting reproduction of the first data at a first time, second reproduction means for starting reproduction of the first data at a second time, and by the first reproduction means A reproduction time adjusting means for matching the reproduction time of the first data and the reproduction time of the first data by the second reproduction means; and after the reproduction time of the first data coincides, A data distribution apparatus comprising: a control unit that merges the reproduction of the first data into either the reproduction unit or the second reproduction unit.   When the first time is earlier than the second time, the reproduction time adjustment means inserts second data into the reproduction data of the first reproduction means, so that the first data 8. The data distribution apparatus according to claim 7, wherein the reproduction time points are matched.   A media server composed of an arbitrary number of stream reproduction units and an arbitrary number of stream control units, a service reception side device having a number of stream service reception units, and a distribution network connecting the media server and the service reception side device; In addition to the contents of the service to be delivered, in the media stream system comprising: a waiting time section for adjusting the time is selectively inserted according to the stream or a pre-inserted one is sent out at a predetermined time A function for switching the media server, the distribution network, or the service receiving side device to a service having the same content as another stream that has started transmission at another time after the stream that has started transmission at each waiting time interval To replace the received stream contents and continue the service. Data distribution method, characterized in that to be able to.   After the transmission of the previous transmission data in the near video on demand, the previous transmission data and the subsequent transmission data are waited for reproduction of the previous transmission data until it coincides with the playback time of the subsequent transmission data. A data distribution method characterized by combining the two.

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