|Publication number||USRE42905 E1|
|Application number||US 11/481,391|
|Publication date||Nov 8, 2011|
|Filing date||Mar 28, 1996|
|Priority date||Mar 31, 1995|
|Also published as||CA2216282A1, DE69517795D1, DE69517795T2, EP0735763A1, EP0735763B1, US6760917, US20030110505, WO1996031057A1|
|Publication number||11481391, 481391, PCT/1996/1412, PCT/EP/1996/001412, PCT/EP/1996/01412, PCT/EP/96/001412, PCT/EP/96/01412, PCT/EP1996/001412, PCT/EP1996/01412, PCT/EP1996001412, PCT/EP199601412, PCT/EP96/001412, PCT/EP96/01412, PCT/EP96001412, PCT/EP9601412, US RE42905 E1, US RE42905E1, US-E1-RE42905, USRE42905 E1, USRE42905E1|
|Inventors||Johan De Vos, Claude Barraud|
|Original Assignee||Sony Europa B.V.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (54), Non-Patent Citations (14), Classifications (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Conventional cable tv systems deliver video data from a distribution company through a cable to monitors of a number of viewers. Although nowadays many programs are distributed through many channels by each cable tv company, the user or viewer has to wait until the desired program is started and transmitted through a selected channel.
Recently, also interactive video systems have been proposed. In such interactive video system a viewer can chose a desired movie to be displayed on the monitor of said viewer. In such video-on-demand system a direct connection to the monitor or end device of a user is established, whereafter a demanded movie can be viewed by the end user.
In this known system it is however virtually impossible to upscale the system after it has been established e.g. by a distribution company. When the number of members for such a system increases and the number of demanded videos is increased, a new interactive video system has to be built.
The present invention provides a system for serving information data to one or more end devices of one or more users, comprising:
This system according to the present invention provides a sort of platform and can operatively be connected to an end user through a public network, can operate as a stand alone system operatively connected to end devices, in which latter case the system according to the present invention is also provided with navigation devices for presenting possible choices for an end user entering the system.
Preferably the routing means comprise at least one ATM switch. The basics and standards of ATM (Asynchronous Transfer Mode) are laid down in recommendations 1.150 and 1.327 as published in March 1993 by the International Telecommunication Union. ATM is generally used for addressing a specific packet-oriented transfer mode which uses asynchronous time division multiplexing techniques. The multiplexed information flow is organized into blocks of fixed size, where said blocks are referred to as cells. A cell consists of an information field and a header. The primary role of the header is to identify cells belonging to the same virtual channel within the asynchronous time division multiplex.
Preferably said information data is video and/or audio data although the present invention is not limited to this application. A system according to the present invention may also comprise applications for video-games, library functions, databanks etc., although a first promising application field relates to video on demand services.
In case the information server system according to the present invention is connected to a public network, the demand data preferably includes a public address to be assigned to the selected information data.
Preferably the managing means provide program data for information retrieval to the end device, so that an end device will be downloaded with such program data from the system. This feature provides the additional advantage that the end device only needs to include very little software for starting up purposes etc.
Although in a small scale configuration, such as in an hotel accommodation or to like, the information services system according to the present invention may comprise only one storage medium unit (and even one end device), the system according to the present invention preferably comprises at least one second storage medium unit. In such a case the managing means comprise a table for storing data representing information data allocation to the first and second storage medium unit on basis of demand data from an end device. In this way the managing means manage the switching of the ATM switch for establishing virtual channels between the end device and the storage medium unit.
Preferably the storage medium unit according to the present invention comprises;
Preferably the information server system in a video and/or audio data application is capable of providing still mode, fast forwards mode, reverse mode, fast reverse mode as in VCR (video cassette recorder) and a mosaic mode operation.
To prevent time delay even in less agile memory means of the storage medium unit, preferably video and/or audio data is divided in a predetermined number of data groups arranged in a sequence different from the original sequence.
Further details, features and advantages of the present invention will be described in the following referring to the next drawings with shell diagrammatic representations of embodiments of the present invention, and wherein
The following description in which reference is made to the figures, describes a combination of hardware and software; it should be understood that some hardware components may be combined into a single hardware component such as a CPU where functions are time multiplexed. It should also be understood that connections between logic (software) units can be more complex than is shown schematically in the figures.
The interactive communication system will be explained below, specifically referring to the embodiment, where video-on-demand (VOD) service is supplied to users. It should, however, be noted here that other applications, such as teleshopping, games and other types of information exchange, are equally possible. Such services can be referred to as information-on-demand services in general.
In the interactive communication system shown in
Navigation devices 30 can provide information on available video programs to any one of the set top boxes 40. Such information can be represented on the monitor 43 of the set top box 40 in a graphical way or by text, or by a combination thereof. Available video programs are video programs which can be selected by a viewer. Such requestable information will hereinafter be referred to as service items. An embodiment of a navigation device 30 is described below in more detail.
The system manager 60 manages operation of the interactive communication system by managing the operation of the ATM switch 1. An embodiment of the system manager 60 will be described below in more detail.
A major feature of an interactive communication system according to this preferred embodiment of the present invention is, that there are no restrictions on the hardware used or the operating system installed. Each set of communication operations is preceded by transmission of a control software program dedicated to such set of operations to a receiving and/or transmitting component, so that the receiving and/or transmitting component can optimally handle the incoming and/or outgoing communication following this down-load of said control software program.
In the embodiment of
When the system manager 60 receives the demand data from an end device 40, the system manager 60 outputs to the ATM switch 1 distribution control data including information of virtual channels for the selected video data produced from the received demand data and an address of the end device 40. Next, the delivery SMU outputs the selected video data with the routing information for this end device 40. A software program for write-in operation is downloaded from the system manager 60 to the RAM 24 of the SMU 20 before copy operation of the video data is performed. The CPU 22 of the SMU 20 controls write-in operation of the physical storage medium, 21 according to the software program for write-in operation stored in the RAM 24. Then the software program for write-in operation in the RAM 24 is replaced with a software program for read-out operation by down-load from the system manager 60 before video service starts. The CPU 22 controls read-out operation of the physical storage medium 21 according to the software program for read-out operation in video service.
The interactive communication system preferably comprises a plurality of (delivery) SMU's. In the system, the necessary video and/or audio data of a particular video and/or audio program is only copied from the archive SMU to one of the delivery SMU's, if the number of end devices 40 with the possibility to select the particular video and/or audio program is smaller than a predetermined number. On the other hand, the necessary video and/or audio data is also copied from the archive SMU or from the above delivery SMU to one or more of the other delivery SMU's, if more than the predetermined number of end devices have the possibility to select the particular video or audio program. The predetermined number can be determined based on certain statistics or real time monitoring of the number of end devices 40 requesting the particular video and/or audio program at a specific point in time.
The preferred embodiment of the present invention provides for the possibility that the number of end users is monitored in run time and that the configuration will dynamically change to prevent the system from overloading. When the number of end users increases, a new delivery SMU can be loaded from the archive SMU or another delivery SMU.
The system manager 60 preferably outputs backup control data, for the situation that one of the delivery SMU's malfunctions. Selected video and/or audio data is then output by another delivery SMU, which is not malfunctioning and is selected according to said backup control data. The conversion table of virtual channels in the ATM switch 1 is updated by the system manager 60 so that the input virtual channel of a possibly malfunctioning delivery SMU is changed to the virtual channel of another delivery SMU to provide the same video and/or audio data from the second SMU.
A user selects the desired navigation service and connects the end device 40 to a navigation device 30 providing the desired navigation service. Navigation data including a software program for displaying a menu of service items and identification data corresponding to each service item is downloaded preferably beforehand from at least one navigation device 30 selected by the end device 40. The monitor 43 of end device 40 displays such a menu of the available service items and, if necessary, corresponding identification data thereof. A menu from navigation device 30 may comprise video and/or audio information and control data, either in graphical form, textual format or a combination thereof, to facilitate the choice for the end user.
If a user selects a video and/or audio program through the input device 44 from the menu by pointing the desired video program with a pointer in the monitor 43 or by entering the identification data corresponding to the desired program, if displayed on the monitor 43, the identification data is supplied to the system manager 60 by the end device 40 via ATM switch 1. Such identification data may be a public address in case that the system manager 60 is connected to public ATM network. The navigation data may further include video data obtained from SMU 20 or navigation device 30. The navigation data down-loaded from a navigation device 30 can also contain information on other selectable navigation devices 30.
In a not shown embodiment an end device 40 can be connected to a navigation device through a public ATM switch, in which case such a navigation device can be selected through a public address. Through such a public navigation device it would also be possible to choose other navigation devices via the first publication navigation device.
The system manager 60 down-loads a VOD-software program for end devices 40 corresponding to a selected video program to the end device 40, after the system manager 60 receives identification data from the set top box 40. The system manager 60 also downloads a VOD-software program for the SMU's 20 corresponding to the selected video program to the SMU 20 via the ATM switch 1, before VOD service starts. The system manager 60 selects the SMU 20 and the most appropriate service items according to data representing video program allocation, for example in the form of a table, in the SMU's 20 and provides distribution control data including the information of the channel and the routing information corresponding to the selected video program to the selected SMU 20 so that the SMU 20 operates to reproduce the selected video program.
A controller 26 in the SMU 20 controls the physical storage medium 21, so that the physical storage medium 21 reproduces selected video data in a play mode selected by the end device 40 as described below in more detail. The reproduced video and/or audio data is supplied to ATM interface 29.
As explained earlier the physical storage medium may comprise a hard disc, a MO disc or tape on which a video movie is recorded.
An ATM interface 29 combines the reproduced video 35 and/or audio data preferably divided into cells each containing 48 bytes with the routing information stored in the memory of the SMU 20 in the form of ATM packets and outputs the same to the ATM switch 1.
Control data from the controller 26 such as control information for the end device 40 is supplied to the end device via the ATM interface 29 and the ATM switch 1. Control data from the end device 40 such as a required play mode is received through the ATM switch 1 and the ATM interface 29.
The ATM switch 1 routes the ATM packets between the end devices 40, the SMU's 20 and the system manager 60 according to the routing information attached to the ATM packets. The conversion table of the private ATM switch 1 is updated by the system manager 60.
In the not shown embodiment wherein a public ATM switch is used in combination with the private ATM switch, the virtual channel connection of the public ATM switch is established by using a public address at the start of the service.
In VOD operation, an end device 40 outputs control data requesting a play mode, such as normal play, fast forward play, reversed play, fast reversed play, still picture mode or more vague mode, to the ATM switch 1 through an ATM interface 41 according to the mode selection on the input device 44 by the user. The ATM switch 1 then routes the control data to the system manager 60. The system manager 60 outputs control data requesting the selected play mode to the ATM switch 1 through the ATM interface. SMU 20 reproduces the selected video data in the selected play mode. As a variation, the control data requesting a play mode can be routed from the end device 40 directly to the SMU 20.
In case of VCR options, the physical storage medium is preferably a hard disc, as such hard disc is more agile than the other mentioned physical storage mediums. As an alternative an MO-disk can be used, on which information is recorded in a staggered fashion, which will be described hereinafter.
The system manager 60 functionally comprises one or more storage medium managers 62, a storage medium group 63 including one or more service item groups 64 and one or more service item providers 65, a service routing manager 66 and a program manager 67. Each storage medium manager 62 may contain static data and/or dynamic data with respect to each SMU 20 under its control. The static data may comprise for example type, costs or recording capacity of each storing medium unit 20. The dynamic data may for example include status information such as whether or not the SMU is occupied by video and/or audio data and whether or not it is being in use, or whether or not it is malfunctioning.
The storage medium group 63 outputs a request for assignment of a SMU 20 to the storage medium manager 62 on basis of the requirements from the end devices 40. Such requirement can be specified by the statistical information, such as potential number of the end devices 40 that can request service in a certain time frame or length of video program. Other possible requirements may be whether or not any end device 40 has a possibility to select the more complex play mode such as mentioned above and including fast forward, fast reverse etc. The storage medium manager 62 proposes a suitable SMU 20 or suitable storage medium in the SMU 20 to a storage medium group 63 for the video service to the end device 40, according to static data and/or dynamic data with respect to each SMU 20 contained therein, e.g. table means, and the request from the storage medium group 63. Further, storage medium group 63 controls down-load operation of software programs to one of the end devices 40 in response to a request from this end device 40.
In case of a plurality of storage medium managers 62, each storage medium manager 62 may propose a suitable SMU 20 belonging to each storage medium manager 62 for the video service to the storage medium group 63. A storage medium manager 62 will ask another storage medium manager 62 to propose a suitable SMU 20, requested by the storage medium group 63, if said storage medium manager 62 can not satisfy the request of the storage medium group 63. More specifically, the service item providers 65 request assignment of one of the SMU 20 to the storage medium manager 62 via the service item group 65. The service item group 65 also control the down-load operation of control software programs originally provided from the program manager 67, which manages all control software programs to be used in the system and delivers each devices updated, suitable, and effective programs.
The service item group 65 can down-load a suitable down-loadable software program to the set top box according to the table therein representing relationship between service item identification and service item provider. When the request is provided from the service item provider, the service item group 65 can decide which down-loadable software is suitable for subsequent operation of the set top box according to the table in the service item group.
Even if the storage medium manager 62 is malfunctioning, the malfunctioning storage medium manager 62 may be restored while the SMU 20 outputs video and/or audio data, as reproduced video and/or audio data is directly output to the ATM switch 1 without routing by the storage medium manager 62.
Next, full VCR functions, for example fast forward, reverse, fast reverse and still play mode will be explained. In the full VCR function, an agile storage medium, for example a hard disc, is used. The agile storage medium is installed in one or more of the SMU's. At the beginning of the video on demand service, the video and/or audio data of the selected video program or video program with possibilities of VCR functions from end device 40, is copied from the archive SMU or a delivery SMU to this agile storage medium. The agile storage medium outputs video and/or audio data in the play mode required by a set top box 40 under control of the system manager 60. The system manager 60 provides for changing the virtual channel, if the full VCR function is requested by the end user, so that such end user is connected to an SMU with a hard disc enabling the full VCR function through the virtual channel. In the case, where an end device 40 is supplied with information from an MO-disc on which this information is recorded in a staggered fashion, and the end device for example request a fast forward or fast reverse play mode, a separate SMU containing an agile hard disc can be employed. This may be advantageous, when time will lapse between the request and the moment another virtual channel delivering this play mode becomes available. When the agile disc is employed intermediately, this agile hard disc can be engaged at a time pointer, corresponding to the time pointer of the virtual channel in use at the time of the request, can be speeded up or slowed down, and can consequently be disengaged, when the time pointer and speed of the agile disc correspond to that of another virtual channel delivering information in the selected play mode from an MO-disc containing information recorded in a forward or reverse staggered fashion.
When a set top box 40 requires simple VCR functions such as stepwise fast forward mode or stepwise fast reverse mode, these simple VCR functions can be performed by another delivery SMU 20. In this case, the delivery SMU which does not include an agile storage medium, for example outputs video and/or audio data recorded in a certain format which will be described hereinafter in a number of virtual channels through the ATM interface with respective time delays between the virtual channels. ATM switch 1 then provides the video and/or audio data in the required play mode to the set top box 40 by changing the relationship between input virtual channels and output virtual channels under control by the system manager 60.
Some examples of communications established between the end devices 40, the system manager 60 and the SMU's 20 by using the table data shown in
The service item provider 64 (SIP-1) then checks the present time and obtains from the table therein the next available time point 0:10 as the starting time of the movie, distribution control data including the number “2” designating the SMU 20 storing the video and/or audio data if the movie and the number “2” designating one of the service item streams (SIS) from the SMU 20 making the movie available from the beginning at the time point 0:10, and the virtual channel number “21” for this stream, and supplies the SMU 20 designated by the end number “2” with the SIS number “2”, virtual channel number “21” and the end device number “STB-2”.
The service item provider 64 (SIP-1) up-dates the conversion table in the ATM switch 1 according to another table data available in the service item provider 64 (SIP-1) so that the relationship between input virtual channel number “21”, for the service item stream (SIS) and the output virtual channel number “21” for the end device 40 (STB-2) is established. Therefore, the data stream of the requested movie is provided to the end device 40 (STB-2) from the beginning at time 0:10.
If the end device 40 (STB-2) requests one of the service item providers 64 (SIP-1) for full VCR function, the service item provider 64 (SIP-1) obtains from the table therein distribution control data including the number “4” designating the SMU 20 having full VCR function capability and the number “1” designating one of the service item streams (SIS) from the SMU 20 designated by the number “4” with the SIS number “1”, virtual channel number “28” and the end device number “STB-1”.
The service item provider 64 (SIP-1) up-dates the conversion table in the ATM switch 1 according to another table data available in the service item provider 64 (SIP-1) so that the relationship between input virtual channel number “28” for the service item stream (SIS) and the output virtual channel “7” for the end device 40 (STB-1) is established. Therefore, the data stream of the requested movie is provided to the end device 40 (STB-1) with full VCR function.
Such an interactive communication system as outlined above is suitable to be used as a platform for a plurality of server-owners, navigation device owners, system manager owners and users simultaneously, where one party can for example exploit one or several SMU's 20, as well as a system manager 60 and/or one or several navigation devices 30.
Next, details of each device will be explained.
CPU 22 of controller 26 controls the storage medium 21 and other operations of the SMU 20 according to software programs stored in ROM 23 and an additional control software program downloaded into RAM 24 and table data stored in this memory of the SMU 20.
The physical storage medium 21 primary contains service items, but can also contain control software program to be down-loaded to the end device 40 or one or more of the SMU's 20 when required.
ROM 23 of the SMU 20 preferably contains a microkernel operating system and a storage medium interface resident software such as an ATM drive, an MO disc driver. The microkernel operating system functions as a basic set of instructions, capable only of the most elementary of communication operations, e.g. down-load of control software specifically tailored for subsequent communications to be performed by the SMU 20. The ATM driver is used for establishing communications through the ATM interface 29. The MO disc driver is responsible for the mode in which the physical storage medium 21 functions which will be described hereinafter. The controller 26 also contains a table 25, in which relationships between virtual channels and end devices 40 are established.
The ATM interface 29 may communicate with the ATM switch 1 in a full duplex mode, where the ATM interface 29 can simultaneously handle incoming and outgoing ATM packets 28. In
RAM 24 contains executable code in ROM 23, a downloadable module for optimum functionality as a server, and a buffer.
The video data recorded in the above manner is sequentially and cyclically reproduced from the storage medium 21. The n-th data groups of the respective T sentences are sequentially stored in the buffer 210 and output to respective different virtual channels through the ATM interface 29. After respective N data groups of T sentences are output, the virtual channels are switched over in the next and following cycles as shown in
Scene 5 appeared after scene 6 by switching from channel 3 to channel 1. Thus reverse skip play is performed.
Video data, which is to be recorded in a storage medium with a format described above, is reproduced from said storage medium 21, and output from the SMU 20 to the ATM switch 1 through the ATM interface 29 as three virtual channels.
In the first and second video data are encoded in accordance with MPEG standard, the second video data should be encoded in the reverse manner of the first video data. In such a case, it may not be possible to reproduce the second video data in the reverse direction as explained above. In the example of
Multi-cast functions will be explained, referring to
The sequence of communication, shown in
In step 5 navigation device 30 provides set top box 40 with a menu of selectable video services, to which the navigation device 30 can gain access. In said menu options can also be included, referring the set top box 40 to another navigation device 30, which can gain access to other video services. In the next step 6 set top box 40 passes the menu on to the user by display thereof on monitor 43. In step 7 the user enters his choice through his input device 44, which in this case is a request for a further menu. This request is relayed to navigation device 30 in step 8, whereupon navigation device 30 supplies a new menu of selections to set top box 40 in step 9. Steps 7-10 can be repeated a number of times, until, as is the case in step 10, a menu displayed on monitor 43 by set top box 40 contains an option for a video program the user wishes to select, which is represented by step 11. Set top box 40 in step 12 requests service item provider 64, denoted by SIP, to provide for a video stream to a top set box with a given public address, corresponding to the address of the service item provider 64. In step 13 service item provider 64 first request service item group 65, denoted by SIG, to provide set top box 40 with control data necessary for optimum handling by the set top box 40 of the video stream to be established, which control software is down-loaded into the set top box 40 in step 14. Now, set top box 40 is capable of issuing commands relating to VCR functions, where in step 15 the first play command is issued to the service item provider 64. In step 16 service item provider 64 locates the first available video stream for the request, which in this case originates from storage medium unit 40, denoted here by SMU1, and sets ATM switch 1, denoted by ATM SW to connect said storage medium unit 20 and set top box 40 by re-writing the virtual channel table in the ATM switch 1. In steps 17 and 18 the requested video stream is routed through ATM switch 1 to set top box 40, where the requested video program can now be displayed on monitor 43.
In the foregoing description a number of characteristics and details have been described with reference to preferred embodiments. It should however be understood that the present invention is not limited to the above description of such preferred embodiment. The requested rights are defined by the following claims.
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|U.S. Classification||725/94, 725/95|
|International Classification||H04N7/173, H04M11/08|
|Cooperative Classification||H04N7/17318, H04N7/17336|
|European Classification||H04N7/173B4, H04N7/173B2|