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Patent No. 5953046 Television system with multiple video presentations on a single channel

 

Patent No. 5953046

Television system with multiple video presentations on a single channel (Pocock, Sep 14, 1999)

Abstract

A system for providing, in a television system, the combination, transmission, and reception of multiple video presentations over a single channel of a television distribution system. Presentations may be concurrently broadcast for viewing by many users, as well as interactively requested for display by many (potentially one thousand or more) individual users. A presentation consists of a sequence of images which reproduce a motion or still image video presentation for the user when displayed. The signal is transmitted in a standard television format, and consists of a sequence of video images from the various presentations being transmitted. A user terminal receiving the transmitted signal is selectably operable to display one of the multiple transmitted presentations with accompanying audio. The terminal identifies the video images on an associated television receiver. The number of concurrent presentations, and the degree of motion in the presentations are variable. User requested Interactive instructions between a user at the terminal end and the presentation system are transmitted by an associated telephone line or other communications link. A selected group of continuously transmitted interactive information can also be accessed without the use of a communications link.

Notes:


FIELD OF THE INVENTION

The present invention is generally directed to a television system which is capable of concurrently distributing multiple video presentations having different video information content over a single television channel for receipt by different respective viewers. For example, a television system in accordance with the present invention can distribute a broadcast video presentation as well as a plurality of interactive presentations from a central presentation system, to respective viewers with associated television set and terminal, by means of a single television channel.

BACKGROUND OF THE INVENTION

An interactive still frame television distribution system is disclosed, for example, in the U.S. Pat. No. 4,734,764 and U.S. Pat. No. 4,924,303. Such systems are particularly suited for interactive video services such as home shopping, financial transactions, education and the like. Generally speaking, in this type of system a viewer sends an indication to a central location describing a video presentation which he desires to receive, e.g. houses being offered for sale by a real estate service. Video frames which show the available houses are individually retrieved from a suitable video presentation which enables it to be retrieved from a suitable video storage medium, and each frame is labelled with an identification code which enables it to be retrieved by the viewer who desires to see it. Other viewers can independently request other presentations available on the system. All of the frames selected by the various viewers are multiplexed onto a transmission medium, such as the trunk cable of a cable television system, and transmitted at the standard television frame rate, e.g. 30 frames per second under the NTSC standard, over a channel associated with the video presentation service. Frame stores are positioned at various locations along the length of the transmission medium, and each is provided with a match code, for example an address. When a video frame is labelled with the match code of a particular frame store, that frame store identifies the frame, stores it in a memory, and then continually retransmits the stored frame at the standard television frame rate to the viewer's television receiver. The continually transmitted frame appears as a still frame on the viewers's television receiver. When the next frame in the presentation is required, this frame is retrieved, labelled with the appropriate code, and transmitted to the frame store for display in the same manner. This process is repeated for all the frames in the still-frame presentation.

A sequence of frames may be sent for each still-frame presentation. If still frames are delivered at sufficient rate, the presentation takes on the appearance of reduced motion rather than distinct still frames. For example, if frames are sent at a rate of 6 per second, 5 concurrent user presentations are possible over a single television channel (having 30 frames per second capacity) with reduced motion. Additional processing within the frame store unit can interpolate several images to display additional images, with the object of producing the appearance of smoother motion.

With the increasing acceptance of the value of interactive television services, there is a clear benefit to the industry to provide an efficient transmission medium for these services. The interactive television systems as disclosed in the U.S. Pat. No. 4,734,764 and U.S. Pat. No. 4,924,303 require a dedicated television channel to offer interactive services. The high cost of dedicating a television channel solely to an interactive service is viable only for the largest of such services. The present invention enables interactive services to begin with a small amount of channel capacity at a fraction of the channel costs.

Additionally, many television telecasters such as cable, direct broadcast satellite (DBS) and wireless cable companies have reached the limit of their channel capacity and are unable to meet the demand of the proliferation of new programming sources. The result is that interactive service providers are unable to acquire the "full" channel required to offer their services. The present invention enables the sharing of channel capacity enabling an interactive medium for broadcasters and information providers. Furthermore, it is highly desirable to include interactive capabilities with many of these broadcast services. As an example, a Public Broadcast Service (PBS) educational video broadcast could simultaneously support a plurality of viewer requested interactive video presentations for example testing and additional information on a particular subject reviewed in the broadcast. Combining these applications onto one channel would save the cost of an additional channel while providing the benefits of interactivity.

Accordingly, it is an object of the present invention to provide a television system which expands the program capacity of each channel of the television system by distributing at least two distinct presentations concurrently on a single channel. It is a further object of the present invention to address the above-mentioned needs by providing a television system which is capable of distributing multiple interactive and broadcast video presentations, to different respective viewers by means of a single television channel, including the combination of full motion, reduced motion and still-frame video presentations. It is a further object of the present invention that the combination of presentations be dynamically variable so that the system can respond to changing presentation requests over time.

 

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The presently disclosed embodiments are therefore considered in all respects to be illustrative and not restrictive. The scope of the invention is indicated by the appended claims rather than the foregoing description, and all modifications that come within the meaning and range of equivalence thereof are intended to be embraced therein.

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