# Patent

## Title
Video on demand methods and systems

## Abstract

An entertainment head-end provides broadcast programming, video-on-demand services, and HTML-based interactive programming through a distribution network to client terminals in subscribers' homes. A number of different features are provided, including novel user interfaces, enhanced video-on-demand controls, a variety of interactive services (personalized news, jukebox, games, celebrity chat), and techniques that combine to provide user experiences evocative of conventional television.

## Background
RELATED APPLICATION DATA
This application is a continuation of U.S. patent application Ser. No. 10/941,168, filed Sep. 14, 2004, which is a continuation of U.S. patent application Ser. No. 09/870,267, filed May 29, 2001, which is a divisional of U.S. patent application Ser. No. 09/201,495, filed Nov. 30, 1998, now issued as U.S. Pat. No. 6,804,825. All are considered to be part of the disclosure of the application and are hereby incorporated by reference herein.
The subject matter of this application is generally related to that disclosed in the following applications:
U.S. patent application Ser. No. 09/201,484, filed Nov. 30, 1998, “Proxy for Video on Demand Server Control” (Bruck et al);
U.S. patent application Ser. No. 09/201,696, filed Nov. 30, 1998, “Method and System for Presenting Television Programming and Interactive Entertainment” (White et al); and
U.S. patent application Ser. No. 09/201,699, filed Nov. 30, 1998, “Interactive Video Programming Methods” (White et al).
The subject matter of this application is also generally related to the subject matter of application Ser. No. 09/153,577, filed Sep. 15, 1998, “Television/Internet Terminal User Interface” (Zigmond et al.).
The disclosures of all these related applications are incorporated by reference.


BACKGROUND AND SUMMARY OF THE INVENTION
Interactive video promises to be a major component of future home entertainment systems. One antecedent—hotel video-on-demand systems—illustrates some of the failings of the prior art.
In an exemplary hotel video-on-demand system, a user with a remote control tunes a television to a predetermined channel on which a menu of on-demand video services is presented. The menu typically solicits entry of a two-digit code, such as 30 for comedy movies, 40 for action movies, 50 for children's movies, etc. In response to user entry of a two-digit code, a further menu is presented detailing movies available under the selected category. The user is then prompted to enter a code corresponding to the desired movie (e.g. 51 for Anastasia, 52 for Antz, 53 for Snow White, etc.).
After entry of a movie selection code (and after confirmation of the video charge that will appear on the hotel bill at checkout), the movie begins playing. The movie thereafter plays continuously. If the viewer receives a telephone call, or wishes to tune the television briefly to another channel, there is no provision for interrupting the on-demand video delivery—the viewer simply misses part of the video. In most systems, if the television is tuned to another channel for more than a brief interval, the on-demand video is terminated. If the viewer wishes to continue viewing the video, it must be started again at the beginning, typically incurring another charge.
Various embodiments of the present invention redress these, and related failings of prior art on-demand video systems.
The foregoing and other features and advantages of the present invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of an interactive video system that can be used in accordance with the present invention.
FIG. 2 is a block diagram of the entertainment head-end of FIG. 1.
FIG. 3 is a block diagram of a client terminal of FIG. 1.
FIG. 3A is a block diagram of a video display screen with a programming guide and a program summary panel of the present invention for summarizing selected programming.
FIG. 4 is an illustration of a video-on-demand selection screen.
FIG. 4A is a plan diagram of a viewer control unit for providing viewer input to an interactive station controller.
FIG. 5 is an illustration of a user interface permitting a user to control playback of an on-demand video.
FIG. 5A is a flow diagram of an interactive method of summarizing selected programming according to the present invention.
FIG. 6 is an illustration of a screen display on a NEWS viewer channel.
FIG. 7 is an illustration of a screen display on a CELEBRITY CHAT viewer channel.



DETAILED DESCRIPTION
Referring to FIG. 1, an exemplary interactive video system 10 includes a entertainment head-end 12 and one or more client terminals 14 intercoupled through a network 16.
The network 16 typically comprises coaxial cable or optical fiber 18, extending from the head-end 12 to distribution nodes 20 within various neighborhoods. From the distribution nodes, further cables 22 couple to individual subscriber premises.
As detailed in the companion application entitled Proxy for Video on Demand Server Control, filed herewith, the network can include one or more proxy servers 24. These are computers interposed between the head-end 12 and the client terminals 14 to perform various system control and user interface (UI) functions.
The proxy server 24 is interposed in a logical TCP/IP control channel 27 between the head-end and clients. While the control signals and the entertainment are physically conveyed on the same cable 18, they are shown separately in FIG. 1 for conceptual clarity.
As shown in FIG. 2, the entertainment head-end 12 includes the components typically associated with a cable television head-end installation, e.g. satellite receivers 26 for receiving satellite broadcasts and producing corresponding baseband analog video signals. Additionally, head-end 12 includes fast digital disk arrays and/or optical storage 28 for storage of MPEG-encoded digital video for on-demand delivery. Head-end 12 also includes one or more interactive services servers 30, which output HTML-based programming (e.g. customized news, celebrity chat, interactive jukebox, and interactive games), as further detailed below. In systems not employing proxy servers 24, the head-end additionally includes a control computer 32 that receives and transmits control data relating to system administration (e.g. channel assignment data, billing information, etc.).
The transmission of these various forms of data from the head-end over the network 16 is straightforward. As is familiar to those skilled in the video arts, the analog video is commonly distributed on 6 MHz channels, beginning at 52 MHz and extending upwardly. The digital video can be encoded on a carrier for transmission within one of these conventional broadcast channels, or can be modulated at one or more other un-used frequencies. Statistical multiplexing is desirably employed to transmit plural channels of digitized video with reduced bandwidth. The HTML-based interactive services and the control data can be transmitted using a conventional protocol (e.g. TCP/IP) and modulated onto a suitable carrier frequency for distribution over the network. Or such data can be transmitted in the vertical blanking interval of analog video broadcasts, as is well known.
After modulation to appropriate distribution frequencies by modulators 34, the various signals from the head-end are combined by an RF combiner 36 for distribution over the network 16.
Each client terminal 14 is an enhanced WebTV terminal that includes a CPU 38, RAM memory 40, non-volatile memory 42, a display screen 44, display driver circuitry 46, a speaker 48 with an associated audio stage 50, a remote control 52, an infrared interface 54, a user interface (UI) 56, a dial-up interface 58, a cable interface 60, and an MPEG decoder 62 (FIG. 3). (The artisan is presumed familiar with WebTV terminals from their many descriptions in the patent and technical literature, and their widespread availability/use.)
The CPU 38 can be any of several microprocessors, e.g. those available from Intel, AMD, Cyrix, Motorola, etc. Alternatively, the CPU can be a custom device that optionally integrates one or more of the other components of terminal 14.
The RAM memory 40 typically comprises 8 or 16K of EDO memory, but more or less memory, and/or memory of differing type, can alternatively be used.
The non-volatile memory 42 in the illustrated embodiment includes a ROM, EEPROM, or flash memory in which certain components of the operating system and applications software are stored. Additionally, the illustrated non-volatile memory 42 includes 4 GB of magnetic disk storage.
Display screen 44 is a CRT of the type conventionally used in consumer televisions, and display driver circuitry 46 serves to provide the excitation signals needed by the CRT, in accordance with input video data provided thereto.
Speaker 48 and audio stage 50 are the audio counterparts to the video display screen and driver circuitry. Desirably, these stages comprise high fidelity speakers and a suitable amplifier, together with audio-synthesis circuitry corresponding to the digital data format by which audio data is transmitted. (For the JUKEBOX service, detailed below, the audio may be transmitted in the MPC3 format, in which case the MPEG decoder 62 may be employed for decoding.)
Remote control 52, and corresponding IR interface 54, are generally conventional, and serve to relay user commands to the terminal in accordance with user manipulation of buttons on the remote control 52.
The dial-up interface 58 in the illustrated embodiment is a modem, coupled to a telephone line. Various different modems and communication links can be used.
The cable interface 60 receives composite data signals from the network 16 and separates them into three general signal types: analog video (typically corresponding to broadcast television programming), digital video (typically corresponding to on-demand video programming), and HTML/control instructions (the former typically corresponding to other interactive services, the latter being instructions exchanged between the client terminal 14 and the head-end 12, a proxy server 24, or a neighborhood node 20). Included in the cable interface 60 is an RF tuner section controlled by the CPU. The illustrated MPEG decoder 62 is an application-specific integrated circuit that converts the MPEG video stream into successive frames of video data.
The user interface 56 in the illustrated embodiment refers to various on-screen visual displays through which—in conjunction with the remote control 52—the user can effect various choices. One of these is switching viewing channels. (As detailed below, switching viewing channels does not necessarily effect a corresponding retuning of the RF tuner portion of the cable interface 60.) Although illustrated separately for clarity, those skilled in the art will understand that the user interface 56 is typically realized as instructions stored in RAM memory 40
The operation of the system is first described with reference to the video-on-demand service. To view an on-demand video, the user first tunes the client terminal 14 to a predetermined channel, the “VIDEO channel.”
Here a distinction should be drawn between two types of “channels.” The first, termed a “transmission channel,” refers to an actual frequency channel (e.g. 52-58 MHz) that is used to relay programming from the head-end 12 to the client terminal 14 over the network 16. The second, termed a “viewer channel,” refers to the moniker (e.g. MSNBC, CNN, GAME, CHAT, VIDEO, FAVORITES) by which a user distinguishes different programming. The mapping between viewer and transmission channels is determined by the system (e.g. by the terminal 14, the head-end 12, or a proxy server 24).
The VIDEO channel is a viewer channel—it is the channel to which the viewer switches to receive video on demand programming. The frequency over which this programming is delivered is not important to the viewer. Different transmission channels may be available for use at different times, depending system resource usage (e.g. other viewers' video-on-demand usage). One day the 108-114 MHz transmission channel might be used to relay on-demand video to a subscriber. The next day, the 114-120 MHz transmission channel might be used instead. Data indicating the assignment of transmission channels-to-viewer channels is periodically relayed as control data among the components of the system 10.
On the VIDEO channel, the user is presented an introductory UI screen 64 of the sort shown in FIG. 4. This screen includes four components: a topical listing of movie categories 66; a feature 68 permitting the user to search a database of available videos by title, actor, director, keywords, etc; a promotion 70 of one of more featured video titles; and other advertising 72. This screen is defined by HTML primitives sent over the network 16, as rendered by the client terminal 14. In the illustrated embodiment, the HTML primitives associated with the video selection screen 64 are sent from the proxy server 24.
The viewer manipulates arrow keys on the remote control 52 to highlight the feature of interest, e.g. a particular topical category. (Highlighting here refers to a visual indicia showing that a particular screen feature, or hyperlink, has been selected for execution. Various forms of highlighting can be used, e.g. a change in color of the feature, a colored box surrounding the feature, etc.) After a desired feature has been selected, a “Go” button on the remote control is pressed, signaling the user's selection to the terminal 14.
If the “KIDS” category was highlighted, the system next presents a screen listing available children's movies (again defined by HTML from the proxy server). Again, the viewer manipulates the remote control to select a particular choice, and then presses “Go.” At this point, an optional screen can be presented confirming billing arrangements (if any).
Once a final video selection has been made, a video control panel UI 74 (FIG. 5) is presented on the screen. In the illustrated embodiment, this panel is translucent, permitting the viewer to perceive imagery “behind” the overlaid panel. (That is, the panel is rendered as a change in luminance of the underlying imagery.) The exemplary video control panel 74 of FIG. 5 includes PLAY, STOP, REWIND, FAST FORWARD, and PAUSE buttons 76A-E. (Additionally, the panel can have a textual or graphical indication 78 of the time remaining in the selected video.) The PLAY button is initially highlighted.
While the control panel is being rendered at the client (from HTML primitives stored in the non-volatile memory 42), the head-end queues the selected MPEG video for playback, and the system (either the head-end 12 or a proxy server 24) selects an available transmission channel. Data indicating the selected channel is relayed to the client terminal 14, which tunes the RF tuner in the cable interface 60 without any user action. The viewer channel, in contrast, remains unchanged at the VIDEO channel.
To play the selected video, the user simply presses the “Go” button on the remote control 52, activating the initially-highlighted PLAY button 76A on the control panel 74. A corresponding instruction is sent to the head-end 12, and video delivery commences. The on-screen video control panel 74 disappears.
If, during playback, the user wishes to stop or pause delivery of the on-demand video (e.g. to answer the telephone, or get a snack from the kitchen), a “Menu” button on the remote control is pressed. The video control panel 74 reappears, this time with the STOP button highlighted. If the user wishes to stop playback, the “Go” button on the remote is pressed. If the user wishes to pause playback, the highlighting on the control panel is moved to the PAUSE button using arrow keys on the remote control, and the “Go” button is then pressed. A corresponding stop or pause instruction is then sent to the head-end 12 from the client terminal 14, interrupting MPEG delivery.
A data record is stored—either at the client, at the head-end, or at a proxy server—indicating the point of video interruption (e.g. by SMPTE code, disk address, time offset, etc.) so that playback can be resumed from that point (or shortly before that point, to provide context).
When either the STOP or PAUSE button is activated on the panel 74, the panel 74 persists on the screen, but the highlighting is switched back to PLAY. (If the PAUSE button is used to resume playback following a pause instruction, and the user activates the PAUSE button to interrupt the video, the highlighting can remain at the PAUSE button.) This arrangement permits the viewer to resume playback simply by pressing “Go” on the remote, since the button that resumes playback is already highlighted. (The panel similarly persists on-screen if the REWIND or FAST FORWARD buttons is activated, with PLAY next highlighted.)
The screen can be put to various uses while the video is interrupted. Examples include presentation of quizzes and other entertainment to viewers who may still be in the viewing room. An indication of waiting email, or commercial or promotional messages, can similarly be presented.
If the stop in playback is brief, the system 10 maintains the assignment of the transmission channel to that video on demand client 14, despite the interruption in video delivery. However, if the interruption period exceeds a threshold value (e.g. ten minutes), the system returns the assigned transmission channel back to the system's pool of available transmission channels. The channel may then be assigned to another use. If the user thereafter resumes playback by pressing “Go” on the remote (PLAY was already highlighted), the system responds by dynamically assigning a new transmission channel, retuning the client's RF tuner and the head-end's modulator accordingly, and resuming playback from (or just before) the point of interruption.
A similar sequence occurs if the user changes to another viewer channel during playback of an on-demand video (e.g. changing to MSNBC to check a sports score). The system interrupts delivery of the on-demand video (e.g. in response to an instruction or notification sent by the client), and a record indicating the point of MPEG interruption is stored. If the user returns to the VIDEO viewer channel within a predetermined period (e.g. 24 hours), the system resumes transmission of the video from the point of interruption. (No user action, e.g. pressing PLAY, is required—no video control panel is presented in this scenario.) Again, the resumed transmission may occur over a different transmission channel, but this detail is transparent to the user.
The illustrated system includes an electronic program guide that can be selectively displayed on-screen to facilitate viewer program selection. Electronic program guides are familiar to those skilled in the art, so are not belabored here. Exemplary program guides are shown, e.g., in U.S. Pat. Nos. 5,758,258, 5,585,838, 5,654,748, 5,526,036, Ser. No. 08/969,979, now U.S. Pat. No. 5,907,323 and Ser. No. 08/968,386, now U.S. Pat. No. 5,874,985 (the disclosures of which are incorporated by reference). Desirably, when an on-demand video is selected, the title of the video appears in the electronic program guide, in association with the VIDEO viewer channel. Additionally, an indication of the time-remaining in the selected video can also be displayed, e.g. as a numeric hour:minute representation, or as a block that extends in a gridded program guide for a distance corresponding to the remaining time. (Data specifying the selected video title and the remaining time is stored in one or more of the components of system 10 and can be inserted into the program guide as appropriate.)
FIG. 3A shows a display screen 78A of one of video display sets 18A with a program summary panel 80A of the present invention rendered thereon. Program summary panel 80A preferably is displayed in conjunction with a programming guide 82A that displays programming available for a particular date over a selected time range. Programming guide 82A includes a channel panel 84A identifying multiple particular channels or services (e.g., four channels or services), a time panel 86A listing particular times (e.g., a two hour time period in 30 minute increments), and a program grid 87A of program tiles 88A listing titles of programming on the identified channels at the listed times.
Referring to FIG. 4A, A directional control keypad 90A allows a viewer to transmit signals for moving a cursor (i.e., an indication of position) between tiles 88A on programming grid 86A.
The cursor may be rendered on display screen 78A as a graphic character or icon or by changing the graphic characteristics of the program tile 88A where the cursor is positioned. The programming identified in a program tile 88A to which a viewer moves the cursor indication is referred to as being focused upon by the viewer or as focused programming. The viewer may initiate or activate selections by depressing an action key 91A and may enter numeric values with numeric key pad 92A.
An interactive station controller generates a program summary panel 80A of the present invention for the programming focused upon by a viewer. Program summary panel 80A includes a preview display window 94A within which the interactive station controller renders display imagery relating the focused programming. The display imagery may include currently available video programming, an on-demand video clip or segment, or a still image.
A text description window may 96A display a program title (preferably of a distinct font), a text description of the program, and one or more information icons relating to selected characteristics of the programming. Preferably, a station controller also provides an audio segment related to the selected programming.
FIG. 5A is a flow diagram showing an interactive method of displaying a summary of programming available on an IT system.
In some embodiments, process block 100A indicates that program schedule information for a predetermined period is retrieved by an interactive station controller from an electronic programming guide (EPG) database 102A in a central control node. The program schedule information includes, for example, program titles, broadcast times, and assigned channels, for a period of, for example, twenty-four hours. An interactive station controller stores the program schedule information in the memory system such as the non-volatile store 42 or RAM 40. The interactive station controller may retrieve the program schedule information upon startup and at periodic intervals after startup.
Process block 104A indicates that the interactive station controller displays a programming guide 82A on video display set 44. Preferably, central processing unit 38 cooperates with a graphics subsystem and the program schedule information stored in memory to render a graphic programming guide 82A of the type shown in FIGS. 3A and 3B.
Process block 108A indicates that a viewer selects or focuses upon a program tile 88 in programming guide 82A as described above, for example.
Process block 110A indicates that interactive station controller 20 accesses summary information about the programming focused upon by the viewer.
Process block 114A indicates that a summary text description of the selected programming and pointers to icons summarizing any selected information about the programming is retrieved from a memory included in the IT system.
Preferably, station controller 20 periodically (e.g., daily or weekly) receives from EPG database 102A summary text descriptions and related icon bitmaps for a predetermined time period and stores them in memory system 42, 40. The Station controller may retrieves from the memory system summary text descriptions and related bitmaps of any icons pointed to and displays the icons and summary text description for the viewer.
Alternatively, the station controller can retrieve from EPG database 102A the summary text descriptions and related bitmaps of icons that are not available in local memory 42, 40 for the program tile 88A selected or focused upon by the viewer. Circumstances in which the summary text descriptions and related bitmaps of icons would not be available in local memory 42, 40 include, for example, the viewer selecting a program tile 88A outside the predetermined time period for which the information is stored in memory 42, 40, a video, graphic, or audio segment being associated with the information, or the information in memory 42, 40 requiring an update or correction.
Decision block 116A represents an inquiry as to whether the selected programming is currently being broadcast and available to the user. Availability of the selected programming relates, for example, to whether the viewer is a subscriber to the selected programming. Decision block 116A proceeds to process block 118A whenever the selected program is currently being broadcast and available to the user and otherwise proceeds to process block 120.
Process block 118A indicates that communication system 62 tunes to the selected programming and displays it on video display set 18 within preview display window 94 of program summary panel 80. A Video processor subsystem may function to size and position the selected programming within preview display window 94.
Process block 122A indicates that a central control node may retrieve preview media information from EPG database 102 or, alternatively, from memory of a station controller. The preview media information indicates whether the preview or display imagery available for the selected programming includes a video clip or segment of or relating to the selected program or a still image of or relating to the selected programming.
Decision block 128A represents an inquiry as to whether a digitized preview video clip or segment is available for the selected programming. Decision block 128 proceeds to process block 130 whenever a digitized video clip or segment is available and otherwise proceeds to process block 132.
Process block 130A indicates that the digitized video clip or segment is cued from an electronic programming guide (EPG) preview server computer at the central control node and transmitted to the interactive station controller for display to the viewer.
Preferably, the digitized video segment relates to the specific episode of the selected programming. If an episode-specific segment is not available, the digitized video segment preferably relates to any program series of which the selected programming episode is a part. If a series-specific segment is not available, the digitized video segment preferably relates to the channel carrying or broadcasting the selected programming.
Process block 132A indicates that a digitized still image is retrieved from EPG database 102 and transmitted to the interactive station controller for display to the viewer. Preferably, the still image relates to the specific episode of the selected programming. If an episode-specific still image is not available, the digitized still image preferably relates to any program series of which the selected programming episode is a part. If a series-specific still image is not available, the digitized still image preferably relates to the channel carrying or broadcasting the selected programming.
Decision block 134A represents an inquiry as to whether the viewer has selected or focused on a different program tile 88A. Decision block 134A returns to process block 110A if the viewer has selected or focused on a different program tile 88A and otherwise proceeds to end block 136A.
A digitized audio segment may be retrieved from EPG database 102A for playing with each digital video segment or still image. The audio segment may include one or more of a voice announcement, an audio portion of the selected programming, or music. The accessing and retrieval of audio segments would be substantially the same as the accessing and retrieval of still images or digitized video segments.
Preferably, the audio segment relates to the specific episode of the selected programming. If an episode-specific segment is not available, the digitized audio segment preferably relates to any program series of which the selected programming episode is a part. If a series-specific segment is not available, the digitized audio segment preferably relates to the channel carrying or broadcasting the selected programming.
The method described above is directed to an IT system in which selected information is stored at and retrieved from EPG database 102A or EPG preview server 131A at a central control node. The benefits of the present invention could also be achieved in IT systems having some or all of the selected information stored at and retrieved from interactive station controllers.
The availability of text description, information icons, and display imagery for use in program summary panel 80A is based upon an electronic programming guide (EPG) database. The EPG database preferably includes the following tables:
i) an episode table containing records for each interactive or broadcast televideo episode;
ii) a series table containing records for each interactive or broadcast series;
iii) a still image table comprising bitmaps or vector graphic definitions of still-image previews or pointers to computer files containing such still image previews;
iv) an audio table containing digitized audio digital wave synthesis definitions or MIDI (Musical Instrument Digital Interface) note and timing definitions of music and voice-over previews or pointers to computer files containing such audio previews;
v) an audio/video table containing digitized video and audio, either in MPEG, AVI, Quicktime or other digital video format for full-motion video and audio storage, or pointers to computer files containing such video previews;
vi) a tuning information table containing broadcast, cablecast or satellite transmission tuning information for channel lineups available to viewers, including network and affiliation information; and
vii) a programming characteristic table containing broadcast properties or characteristics such as closed captioning and viewer discretion advised, which include pointers to image definitions of associated descriptive icons.
Within the EPG database, each programming event or episode record is linked to a parent series record. One-time programming events or specials have a single episode record linked to a single series record. Each episode record can have pointers to episode preview or display imagery in still image, audio, or multi-frame digital video format. Each episode may also be linked to selected broadcast properties that identify selected characteristics of the episode.
Similarly, each series record may have pointers to previews or display imagery relating to the series in still image, audio, or multi-frame digital video format, or selected broadcast properties that identify selected characteristics of the series Also, each channel record may have pointers to previews or display imagery relating to the channel in still image, audio, or multi-frame digital video format, or selected broadcast properties that identify selected characteristics of the channel. The term channel refers to a provider of programming and can include, for example, a broadcast network or an application provider.
Retrieval of text description, information icons, and preview display imagery entails correlating the programming selected or focused upon by the viewer with the corresponding episode record. Any pointers in the record to program summary information are tracked and the information is retrieved. If no pointers to program summary information are associated with the episode, the programming selected by the viewer is correlated with the corresponding series record in the series table. Any pointers to series-specific program summary information are tracked and the information is retrieved.
If the series record contains no pointers to program summary information, a default still image or graphic retrieved for rendering within preview window 94A. The default still image may be a channel-specific image or graphic for the channel carrying or transmitting the selected programming or a predetermined IT system or EPG image or graphic.
This listing of an on-demand video amidst broadcast television programming in an electronic program guide contributes to user perception of on-demand video as just another channel. It is desirable to present all video services in this television-like paradigm so as to present a seamless, familiar experience to new users.
Providing a television-like interaction for on-demand video is one thing; extending that experience to HTML-based video services is another. In the following discussion, several different HTML-based services are described. Various techniques are employed in such services to contribute to a television-like experience.
One technique is to make the screen look like a television screen. Computer displays typically have an image area bounded by straight edges. Since the edge of the CRT tube is typically not straight but is slightly curved, there is commonly a thin black margin at some or all of the edges of computer monitors. The display does not extend into this marginal area lest it render another part of the image off-screen. Television displays, in contrast, are not so concerned with rendering accuracy. Instead, the emphasis is on providing the largest apparent image size. Accordingly, the screen is typically overscanned—with at least certain scan line ends extending beyond the visible portion of the screen. Accordingly, one technique to yield a more television-like experience when displaying HTML-rendered graphics is to deliberately overscan the screen.
A related technique is to avoid displays that are larger than the viewing screen. Many “pages” on the world wide web require “scrolling” to view portions extending off the bottom of the screen. While this is a familiar operation for web-surfers, it is wholly foreign to television viewers and is desirably avoided.
Another technique for enhancing the television-like appearance of HTML graphics is to employ production techniques and values evocative of television programming. For example, fades, dissolves, and wipes are video transition effects that viewers routinely encounter in television programming. However, they are used rarely—if at all—in HTML productions. Their use in the interactive services detailed below contributes to a television-like experience.
Yet another integrating technique is to list the interactive services (e.g. GAMES, CELEBRITY CHAT, JUKEBOX, NEWS) in the system's electronic program guide simply as additional channels, amidst the other channels familiar to viewers (e.g. network broadcast channels and cable channels).
By techniques such as these, viewers encounter interactive video entertainment and conventional television programming in a seamless, familiar context. This is important because, as will be evident from the following discussion, interactive video entertainment itself can be quite different from conventional TV.
Interactive entertainment encompasses a wide range of content. Some forms have antecedents in other contexts or media. Other forms are wholly new. A few examples will serve to illustrate the wide range of possibilities.
A first exemplary interactive video service is a jukebox. When a user first switches to the JUKEBOX viewer channel, a user interface akin to the video selection UI 74 is presented on-screen. However, instead of permitting selection of movies, it permits selection of music (e.g. by genre, artist, title, etc.). Selected music can then be played through the terminal's audio speakers 48 using similar procedures and playback UI as detailed earlier for playback of on-demand video. As before, if the user switches away from the JUKEBOX viewer channel, playback of the selected audio is interrupted and a pointer is stored indicating the point at which the selection should be resumed.
During playback, rather than let the display screen 44 sit idle, it is desirably used in conjunction with the selected music. It may, for example, present a music video to accompany the selected audio recording. Or it may present information related to the selection, e.g. artist biography, critic reviews, listings of other recordings of the same selection by different artists, the artist's upcoming concert schedule, etc. It may also allow the user to purchase the music, whether on CD or otherwise. (All such options can be hot-linked to other screens of HTML data, as is conventional on the world wide web.)
Desirably, the system monitors the user's musical selections, and automatically compiles a profile of the user's preferences (e.g. by genre, artist, etc.). Alternatively, the user can explicitly define his or her preferences. (As with other data stored in distributed system 10, the user's jukebox preferences can be stored in the client terminal, at a proxy server, or at the head-end, or distributed therebetween.) When the user thereafter returns to the JUKEBOX viewer channel, a selection menu configured to focus on these preferences can be presented. (The focused selection menu also includes the option of returning to the general, all-encompassing music selection screen.)
A second exemplary interactive service is NEWS. This viewer channel delivers personalized news information in a television-like format. The channel is organized like CNN Headline News, with a small number of news categories that are continuously cycled-through several times an hour. Categories can include, e.g., headlines, sports, weather, traffic, and financial. The presentations in each category can be static (e.g. text articles), but more typically include streaming video excerpts.
An exemplary presentation of NEWS is shown in FIG. 6. In addition to showing part of the current Headline category, the screen 80 gives the user the option of switching immediately to any other category (sports, weather, or stocks in the illustrated screen). Again, such selection is made by the user with arrow keys on the remote control, by moving highlighting to the desired choice and pressing the “Go” button.
As with the JUKEBOX channel, the NEWS channel allows the viewer to define and store personal news preferences (e.g. a selected ticker of stock prices, Chicago Cubs news, weather for Chicago, etc.). If local client disk storage permits, all news is downloaded and stored, in a FIFO basis, in disk storage allocated thereto. This locally-stored news is then filtered in accordance with the viewer's preferences for display. This arrangement allows the user to change preferences and apply the new preferences to recently downloaded news.
As in the earlier-described embodiments, state data indicating the status of the NEWS channel can be stored whenever the user switches to another viewer channel, so that the NEWS channel can resume at the point of interruption.
A third illustrated interactive channel is CELEBRITY CHAT. This viewer channel presents different celebrities with which participants can chat in a moderated dialog. The celebrities are scheduled at specific times, much like conventional TV talks shows.
In the illustrated arrangement, viewers compose typed questions on a keyboard optionally provided with the client terminal, and send them e-mail fashion to a moderator of the CELEBRITY CHAT channel. The moderator (human or automated) selects questions of widespread appeal and poses them to the celebrity. The posed questions, and the celebrity's responses, are distributed to all viewers of the CELEBRITY CHAT channel over the cable network. (By this arrangement, the dial-up telephone link is activated only briefly—when the user-composed question is emailed to the moderator—saving dial-up charges.)
A user interface 82 associated with the CELEBRITY CHAT channel is shown in FIG. 7. In this embodiment, the chat is presented in typed form. (In other embodiments, of course, streaming audio/video can be employed to present the moderator and the celebrity in their dialog. This can be supplemented by other textual or multi-media presentations related to the celebrity, e.g. music video, movie clips, biographical data, etc.) At the bottom of the screen is an Ask Question feature 84 that can be activated (as before, with arrow keys and the “Go” button on the remote control) to permit entry of the e-mail question in a box 86. After typing the question, the user hits Return on the keyboard. This terminates entry of the question, and activates the dial-up connection through which the question is transmitted to the moderator. After the question has been transmitted, the dial-up link is automatically terminated. If the viewer's question is selected by the moderator, it will eventually appear in the typed transcript of the interview—together with the celebrity's response.
Due to the involvement of other viewers in the CELEBRITY CHAT channel, it is difficult to suspend the state of the channel if the viewer switches to another channel and later returns. In the illustrated embodiment, a viewer returning to the CELEBRITY CHAT channel sees only the last screenful of question-and-answer dialog.
A fourth interactive channel is GAMES. A viewer tuning to this channel is presented with a menu of game options—typically topically arranged. Some games are single player. Other games involve a community of players who are participating in the game. The latter are typically scheduled at prearranged times like television programs (e.g. Dungeons and Dragons, 9:00 p.m. every evening).
Contests and tournaments can be conducted on the GAMES channel, with sponsors awarding prizes (e.g. a free month of WebTV) to high-scorers—either of a single session or over a given period (e.g. a month).
Some games may require execution of software applets on the client terminals, rather than just the rendering of HTML primitives. Such software can be downloaded to the terminal as necessary, or just in advance of scheduled multi-player games. Since some games require relatively large blocks of instructions or data on relatively short notice (depending on the turn of events in the game), same is desirably downloaded in anticipation of likely use, rather than when needed.
If the selected game is of the single-player variety, then state data memorializing the status of the game can be stored if the viewer turns to another channel. When the viewer thereafter returns to the GAMES channel, the game can be resumed at the point of interruption. (Again, due to the involvement of other participants in multi-player games, it is generally impractical to try and permit the viewer to resume an interrupted multi-player game at the point of interruption.)
A further feature of the illustrated client terminal is to automatically record favorite broadcast television programs. The client monitors the user's viewing habits to determine favorite shows (e.g. StarTrek Voyager, Wednesdays, 6:00 p.m., viewer channel FOX). Thereafter, if the terminal is not activated by the user to watch one of these favorites, the terminal notices the event and automatically copies the program onto disk, to the extent storage space permits. (MPEG compression—either software-based, or employing a dedicated MPEG compressor ASIC—is typically employed.) This stored program is then listed by title and length in the electronic program guide, as available for viewing on the FAVORITES channel. If the viewer switches to this channel, the recorded program is played back automatically. The playback UI of FIG. 5 is selectively presented (e.g. by pressing the Menu button on the remote control) to allow the viewer to control playback. If several favorite programs have been stored, the viewer is first presented with a menu screen on the FAVORITES channel by which the desired program can be selected.
Recorded programs are not deleted after viewing. However, their storage space may be overwritten by other recordings. Recorded programs that have not been viewed are overwritten as needed, oldest first. Viewed programs are overwritten before non-viewed programs. (Programming implementing a variety of more complex rules and policies is typically provided to govern which recorded programs are deleted to provide storage for new programs.)
Video storage at the client terminal also permits a viewer to take a break from broadcast programming without missing anything (as would otherwise occur). When a viewer wants to take a break, a Delay Program button is selected from an Options menu that is controllably presented on the screen in response to a button on the remote control. When the Delay Program button is activated, the then-tuned program is routed to the MPEG compressor and copied to disk. When the viewer thereafter returns, the viewer activates a Resume Program button on the Options menu. Copying of the incoming broadcast continues, but simultaneous playback of the earlier recorded portion commences and is displayed on the screen. The disk thus acts as a circular buffer.
Yet another feature of the illustrated embodiment is an arrangement by which the system can suggest programming that may be enjoyed by different users. The system compiles profiles of each user's viewing habits (e.g. Viewer A's favorite shows appear to be (a) 60 Minutes, (b) StarTrek Voyager, and (c) Dharma and Greg; the profile includes less-frequently viewed programs as well). Each such profile is correlated with other viewers' profiles to find affinity groupings of users with similar profiles. Viewing suggestions can then be made based on the system's determination of other programming that is popular among other members of the group. For example, from an analysis of the profiles of viewers most closely correlated with Viewer A, the system may note that a significant number also watches Third Rock From the Sun. System records may show that Viewer A has never watched this program and the system may thus propose (either in response to a viewer's query or autonomously) that Viewer A may enjoy Third Rock From the Sun.
Desirably, the profiles are based on more than a single favorite program for each viewer. Although a single favorite program could serve as the basis for affinity grouping, this is generally too clumsy a metric (e.g. many viewers of Seinfeld have otherwise divergent viewing preferences).
The profiles need not be based on favorite programming alone. Many other factors can be considered in forming affinity groupings, e.g. time-of-day viewing habits, zip code, game/chat/interactive news/jukebox preferences/habits, etc.
From the foregoing it will be recognized that the illustrated system redresses many shortcomings of the prior art, and provides a great number of features not previously available.
Having described and illustrated the principles of our invention with reference to a preferred embodiment and various alternatives, it should be apparent that the invention is not limited to the detailed arrangements.
For example, while the disclosure particularly considered use of visual user-interfaces, many of the principles detailed above can be applied equally-well to user interfaces employing other techniques, e.g. gesture-interfaces, audio interfaces, tactile interfaces, etc.
Some embodiments include a preview display window 94A. Video clips or segments of multiple frames would preferably be rendered in preview display window 94A for future non-pay per view broadcasts, interactive services such as news-on-demand or an interactive game service, past broadcast services, video-on-demand (VOD) services, and if, bandwidth is available on network 16, audio-on-demand and current or future pay per view broadcasts.
Similarly, while the detailed embodiment employed certain UI conventions (e.g. the video control panel disappears after PLAY is activated), other embodiments can employ other UI conventions (e.g. the control panel persists, or is minimized, or becomes more transparent, etc.)
Several references were made to HTML. This term is meant to include not just Hypertext Markup Language per se, but also to encompass other graphical and/or video representation systems by which primitives can be combined to yield desired static or moving displays.
The illustrated embodiment employed a wired link to the interactive network, but other distribution arrangements (e.g. direct satellite broadcast, with telephone return channel) can likewise by used. Similarly, the dial-up link is not exclusive; other arrangements (e.g. MetroCOM, etc.) can be used, depending on the needs of the particular application.
Moreover, even a “wired” link to the interactive network needn't be of the sort particularly illustrated. With enhanced compression techniques and delivery technologies, other arrangements—including plain old telephone service—can alternatively be employed.
To provide a comprehensive disclosure without unduly lengthening this specification, applicants incorporate by reference the disclosure of U.S. Pat. No. 5,648,824, which discloses additional details related to video-on-demand systems and related user interfaces.
While the foregoing discussion has detailed a complete system, it employs many inventive concepts—each of which is believed patentable apart from the system as a whole.
In view of the many different embodiments to which the above-described inventive concepts may be applied, it should be recognized that the detailed embodiments are illustrative only and should not be taken as limiting the scope of our invention. Rather, we claim as our invention all such modifications as come within the scope and spirit of the following claims, and equivalents thereto.

## Claims

1. A method of presenting entertainment comprising:
receiving composite video signals from a network;
separating the composite signals into analog video, digital video, and HTML primitives/control instructions, the composite signals including plural transmission channels;
displaying, on a screen, a selection of on-demand videos, the screen display defined by at least a portion of the HTML primitives;
rendering a control panel on the screen using at least a portion of the HTML primitives;
receiving a request to display an on-demand video from the displayed selection of on-demand videos;
converting the digital video into successive frames of video data, the successive frames of video data comprising a portion of the on-demand video;
receiving an indication of a waiting email message;
displaying the portion of the on-demand video on the screen;
receiving a request to pause display of the portion of the on-demand video;
in response to the request, resumably interrupting display of the portion of the on-demand video; and
during the resumably interrupted display of the portion of the on-demand video, displaying an indication of the waiting e-mail message, wherein the indication of the waiting e-mail message is in response to receiving a request to pause the display portion of the on-demand video;
monitoring a length of time that the pause request has been pending and dynamically reassigning a new transmission channel if the pause request has been pending for longer than a predetermined threshold period.

2. The method of claim 1 wherein after receiving the request to pause display of the portion of the on-demand video, a data record is stored at a head-end indicating a point of interruption of the received video signals.

3. The method of claim 1 wherein after receiving the request to pause display of the portion of the on-demand video, a data record is stored at a proxy server indicating a point of interruption of the portion of the on-demand video.

4. The method of claim 1 wherein after receiving the request to pause display of the received video signals, a data record is stored in memory indicating a point of interruption of the portion of the on-demand video.

5. The method of claim 4 wherein the portion of the on-demand video is recorded during the interruption.

6. A method of presenting entertainment comprising:
receiving video signals a composite signal comprising plural transmission channels modulated onto separate carrier frequencies;
on at least one of the transmission channels, receiving video on demand programming;
on at least one of the transmission channels, receiving HTML-based content including existence of a waiting message;
mapping the video on demand programming transmission channel to a viewing channel;
displaying, on a display screen turned to the viewing channel, the received video on demand programming;
receiving a request from a user to pause display of the received video on demand programming;
in response to the request, resumably interrupting display of the received video on demand programming;
during the interruption, displaying an indication of the waiting message, the indication being displayed in response to the request from the user to pause the display;
removing a control panel from the display screen if a first on-screen control is actuated;
and maintaining the control panel on the display screen if a second on-screen control is actuated;
wherein the second on-screen control is a PAUSE button;
monitoring a length of time that the interruption is pending and dynamically remapping the video on demand programming transmission channel if the interruption has been pending for longer than a predetermined threshold period.

7. The method of claim 6 further comprising resuming display of the received video on demand programming on a different transmission channel.

8. The method of claim 6 wherein the message is a chat message.

9. The method of claim 6 wherein the message is an electronic mail message.

10. The method of claim 6 wherein the message is a promotional message.

11. The method of claim 6 wherein the message is a commercial message.

12. A system for providing entertainment, the system comprising:
a display device;
a remote control;
a digital processor;
volatile and non-volatile memory;
a network connection; and
digital processor executable instructions stored in memory for performing a method comprising,
receiving from the network a composite signal comprising plural transmission channels modulated onto separate carrier frequencies;
on at least one of the transmission channels, receiving video on demand programming;
on at least one of the transmission channels, receiving television programming;
on at least one of the transmission channels, receiving HTML-based content;
mapping the video on demand programming transmission channel to a viewing channel;
displaying, on the display device turned to the viewing channel, the received video on demand programming;
receiving, in the HTML-based content, existence of a waiting email;
receiving a request from a user to pause display of the received video on demand programming;
in response to the request, resumably interrupting display of the received video on demand programming; and
displaying an indication of the waiting e-mail while the display of the received video on demand programming is resumably interrupted, the indication of the waiting e-mail being displayed in response to the request from the user to pause the display;
monitoring a length of time that the interruption is pending and dynamically remapping at least one of the transmission channels.

13. The system of claim 12 wherein after receiving the request, a pause instruction is sent out on a network connection and a data record is stored at a head-end indicating a point of MPEG interruption.

14. The system of claim 12 wherein after receiving the request, a pause instruction is sent out on a network connection and a data record is stored at a proxy server indicating a point of MPEG interruption.

15. The system of claim 12 wherein after receiving the request, a data record is stored in memory indicating a point of display interruption.

16. The system of claim 12 further comprising resuming display of the received video on demand programming.

17. The system of claim 12 which includes removing a displayed user interface if a first control on the user interface is selected and maintaining the displayed user interface if a second control on the user interface is selected.

18. A system for providing entertainment, the system comprising:
a display screen;
a remote control;
a digital processor;
volatile and non-volatile memory; and
digital processor executable instructions stored in memory for performing a method comprising,
receiving a composite signal comprising plural transmission channels modulated onto separate carrier frequencies;
on at least one of the transmission channels, receiving video on demand programming;
on at least one of the transmission channels, receiving television programming;
on at least one of the transmission channels, receiving HTML-based content including indication of a waiting email;
mapping the video on demand programming transmission channel to a viewing channel;
displaying, on the display screen, the received video on demand programming on the viewing channel;
receiving a request from a user to pause display of the viewing channel;
in response to the request, resumably interrupting display of the viewing channel;
displaying the indication of waiting e-mail while the display of the viewing channel is resumably interrupted the indication of the waiting e-mail being displayed in response to the request from the user to pause the display; and
removing a displayed user interface from the display screen if a first control on the user interface is selected and maintaining the displayed user interface if a second control on the user interface is selected, the displayed user interface created from HTML primitives received from the HTML-based content, the HTML primitives stored in the non-volatile memory;
wherein the second control is a PAUSE button;
monitoring a length of time that the interruption is pending and dynamically remapping the video on demand programming transmission channel if the interruption has been pending for longer than a predetermined threshold period.

19. A computer executable method comprising:
receiving a composite signal comprising plural channels modulated onto separate carrier frequencies;
on at least one of the plural channels, receiving on-demand video programming;
on at least one of the plural channels, receiving television programming;
on at least one of the plural channels, receiving HTML-based content including an email waiting indication;
storing the HTML-based content in a local storage device;
displaying the on-demand video programming on a display device;
receiving a request from a user to delay the on-demand video programming display;
resumably interrupting display of the on-demand video programming responsive to the request; and
maintaining a current channel for the on-demand video programming despite the request from a user to delay;
if the delay exceeds a predetermined threshold, returning the current channel to a system pool and reassigning the channel if playback resumes;
while the video programming display is resumably interrupted, displaying an indication of the waiting e-mail message on the display device, the indication of the waiting e-mail message being displayed in response to the request from the user to delay the on-demand video programming display.

20. The computer executable method of claim 19 wherein in response to the request to delay the on-demand video programming, a data record is stored at a proxy server indicating a point of video programming interruption.

21. The method of claim 19 wherein in response to the request to delay the on-demand video programming, a data record is stored in memory indicating a point of video programming interruption.

22. The method of claim 19 wherein the request from a user to delay the on-demand video programming display is indicated by a gesture interface.