US20080184319A1

Movatterモバイル変換

Info

Publication number: US20080184319A1
Application number: US12/058,900
Authority: US
Inventors: Roy J. Mankovitz
Original assignee: Gemstar Development LLC
Current assignee: Adeia Guides Inc
Priority date: 1997-04-21
Filing date: 2008-03-31
Publication date: 2008-07-31
Also published as: US9113122B2; US20060271980A1

Abstract

A television system allows a viewer of a text-enhanced television program to pause the program at a particular frame, browse the enhancements at his or her leisure, and then resume viewing the program from that frame, without losing continuity of the video and enhancement portions of the program, or program content. This is accomplished by time-shifting the television program for later playback. Time-shifting is accomplished through the use of mass storage devices such as semiconductor memory, optical disks, magnetic storage and other FIFO data storage structures. Markers are available that allow the viewer to return to the program at the point that he stopped watching, replaying the program from that point. Text enhancements are provided through the VBI present in a conventional television broadcast signal, through an Internet connection, or by a wireless means such as a pager or cordless telephone. Additionally a back link may be utilized to allow the viewer to summon the text enhancements or interact with the enhancements already present.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. application Ser. No. 09/297,151, filed Apr. 26, 1999, which is a §371 application of PCT/US98/08305; U.S. Provisional Application Ser. No. 60/044,161, filed Apr. 21, 1997; and U.S. Provisional Application Ser. No. 60/052,248, filed Jul. 11, 1997, the disclosures of which are all hereby fully incorporated by reference.

This application is also a continuation-in-part of U.S. application Ser. No. 10/047,940, filed Oct. 25, 2001, which is a continuation of U.S. application Ser. No. 09/369,755, which claims the benefit of U.S. Provisional Application Ser. No. 60/095,740, filed Aug. 7, 1998; PCT Application No. PCT/US98/08305, filed Apr. 20, 1998; and U.S. Provisional Application Ser. No. 60/052,248, filed Jul. 11, 1997, the disclosures of which are all incorporated herein by reference.

BACKGROUND

The present invention is a system wherein television program-related information (PRI) is embedded in the vertical blanking interval (VBI) of a television signal for display on a viewer's television screen at the same time as the television program. The PRI is typically contained in an Internet site, the addresses for which are embedded in the television signal. The Internet site addresses may also be transmitted synchronously with, but separate from the video portion, e.g., via an interface device such as a telephone or cable modem. Typically such an “enhanced” television program consists of a display with the video portion of the program in a picture-in-picture (PIP) window and the PRI in the remaining portion of the display area of the television screen.

This PRI may be any textual or graphic information associated with the current television program. The PRI may consist of a textual display of a World Wide Web (WWW) or other Internet site address to which the viewer can choose to link to through a connection with an Internet Service Provider. Alternatively, the PRI may be contained in one or more Web pages, the addresses of which are inserted into the vertical blanking interval (VBI) and are automatically retrieved by the user's terminal and displayed on the display screen. Some examples of PRI are cast members' biographies, trivia about the show, information relating to the particular episode or scene, and closeups of information that cannot be readily seen or is hidden in the video portion of the program. Some of the PRI may be time dependent on the program. For example, the PRI may change to correspond to a particular scene or frame of the television program.

With so much information on the screen, some of which may be changing at a fairly rapid pace, it is desirable to provide the viewer the option of pausing a particular frame of a text-enhanced program display and then resume viewing the program without losing continuity of the video and PRI portions of the program or program content.

In the past fixed delays have been generated to allow broadcast editing. This has been accomplished with video recording. With the increasing availability of low cost semiconductor memory it is desirable to utilize this as a method of variability time-shifting a program. Concurrently other erasable storage means such as magnetic bubble semiconductor memory, erasable optical disks economically provide FIFO storage of large quantities of data that are advantageously utilized in the embodiments of the invention.

According to one embodiment of the invention, a television system is provided which allows a viewer of a PRI-enhanced television program to pause the program at a particular frame, examine the PRI at his or her leisure, perhaps browse through other, linked Web pages, and then resume viewing the program from that frame, without losing continuity of the video and PRI portions of the program or program content.

SUMMARY

According to one embodiment of the invention, an apparatus for time-shifting video and program related information (PRI) in an enhanced television program is provided which includes a display screen, a tuner for receiving a television signal with embedded data representative of an address for an Internet site including PRI, means for extracting the embedded data from the television signal, a memory for storing the embedded data, input means for inputting viewer commands, a time-shifting apparatus capable of simultaneously storing the television signal as it is received and outputting the stored television signal for display, means for communicating with an Internet service provider to retrieve information from the Internet site including the PRI, and a microcontroller.

The microcontroller is configured to retrieve the Internet site address from memory and retrieve the PRI from the Internet site in response to a first viewer command, generate a composite display including a television program contained in the television signal in a first portion of the display and the PRI in a second portion of the display in response to the first viewer command, control the time-shifting apparatus to store the television signal as it is received and display a still frame from the stored television signal in a first portion of the display screen in response to a second viewer command, and control the time-shifting apparatus to output the portion of the stored television signal subsequent to the still frame for display in the first portion of the display in response to a third viewer command.

According to another embodiment, a method for time-shifting video and program related information (PRI) in an enhanced television program is provided which includes the steps of receiving a television signal with embedded data representative of an address for an Internet site including PRI, extracting the embedded data from the television signal, storing the embedded data in a memory, selecting an Internet mode in response to a first viewer command, communicating with an Internet service provider to retrieve information from the Internet site including the PRI, displaying a television program contained in the television signal in a first portion of a display screen and the PRI in a second portion of the display screen, storing the television signal in a time-shifting apparatus and continuously displaying a still frame from the stored television signal in response to a second viewer command, and simultaneously displaying the television program subsequent to the still frame from the stored television signal and continuing to store the television signal as it is received in response to a third viewer command.

According to an alternate embodiment, one or more suspend flags are embedded in the television signal, and the “pause” operation wherein the television signal is stored in the time-shifting apparatus and the still frame displayed in response to detection of such a suspend flag. This feature may be deactivated such that the “pause” operation is only performed in response to a viewer command.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing features and advantages of the invention will be better understood by referring to the following drawings:

FIG. 1 is a schematic block diagram of a time-shifting apparatus according to one embodiment of the invention;

FIG. 2 is a display screen in an Internet mode of the time-shifting apparatus;

FIG. 3 is a display screen accessed by the viewer from the display screen ofFIG. 2;

FIG. 4 is an alternate layout of the display screens ofFIGS. 2 and 3;

FIG. 5 is an exemplary screen of an enhanced television program;

FIG. 6 is the exemplary screen ofFIG. 5, but at a later time;

FIG. 7 is a block diagram of an apparatus that implements the time shifting of a television program and PRI;

FIG. 8 is a time plot illustrating an exemplary pause operation;

FIG. 9 is a time plot illustrating systems operation at a later time; and

FIG. 10 is a time plot illustrating all enhancement information being extracted from the VBI and stored in RAM regardless of time-shifting apparatus operation.

DETAILED DESCRIPTION

InFIG. 1, the reference numerals refer to the same elements described in application Ser. No. 08/475,395 filed on Jun. 6, 1995, the disclosure of which is incorporated fully herein by reference. In addition, the system includes 1) anInternet service provider33 connected tomicroprocessor24 by atransmission link34 such as a telephone network or a television cable, 2) aVBI decoder35, 3) a website data memory36 (memory36 could be part of the RAM ofmicroprocessor24 or in terms of the disclosure of the '395 application, memory22), and 4)a digital Storage Device52 with associate analog-to-digital and digital-to-

analog converters

50,54. An interface device such as a telephone or cable modem (not shown) couples transmission link34 tomicroprocessor24, if necessary.Internet service provider33 is connected to an Internet backbone in well known fashion to access data at any site on the WWW.

Storage device52 is a television signal time-shifting apparatus. One such time-shifting apparatus is disclosed in U.S. patent application Ser. No. 08/388,345 to Russo, et al. filed Feb. 14, 1995, which is fully incorporated herein. Such a time-shifting apparatus includes an optical disc for storage of video programs and separate READ and WRITE heads which operate simultaneously such that real time program information can be stored on the disc while previously stored information on the disc can be read and output to the television signal for display. Other storage media which are capable of rapidly storing extremely large amounts of information may also be used, including magnetic tape, optical disk, magneto-optical disk, or solid state memory (i.e., a high capacity charge coupled device), video RAM, etc.

The Storage Device52 holds a large video data buffer (not shown) for storing the television program in digital form. Preferably, the Storage Device is a random access storage medium allowing concurrent reading and writing operations, so that the incoming television signal data may be written to the Storage Device while earlier stored television signal data is being read out for display on TV20 (that is, time-shifting of the television signal data is performed). The Storage Device52 has two heads that are separately positionable. When display of the television program is to be suspended, the read head is kept in the same position until a resume command is received. The write head, however, keeps moving to record the incoming television signal data.

To enable a television viewer to access information about a television program that the viewer is watching, PRI is embedded in the VBI of the television signal carrying the television program. For example, the PRI may be textual information regarding actors and actresses in the show, advertisements of program-related merchandise, brief descriptions of the plot of future episodes of the television program, or any other text regarding the television program, or the PRI may be text representing web pages containing such information.

According to a preferred embodiment, the PRI is contained on a web page, the address for which is embedded in the VBI of the television signal. When the television signal carrying the program being watched is captured bytuner11, the website data embedded in its VBI is stripped out byVBI decoder35 and sent tomicroprocessor24 for storage inwebsite data memory36. The memory addresses of the website names are linked to the website addresses inmemory36. An icon appears on the screen oftelevision20 when the television program is displayed full screen, i.e., in the TV mode, to inform the viewer that website data accompanies the television signal and is stored in memory22. If the viewer wishes to access a website in connection with the television program, the viewer presses a button on aviewer input device28 such as a remote controller, which introduces the Internet mode of operation shown inFIG. 2 and described below.Microprocessor24 is programmed to carry out this operation. By repeatedly pressing a button on the viewer input device, the viewer can toggle back and forth between the TV mode and the Internet mode. Although viewer inputs are discussed herein as initiated by buttons on a remote controller, other input devices can also be used. For example, a cursor could be displayed on the television screen which is movable around the screen and a selection can be made (i.e., “clicked”) when the cursor is in a desired location of the screen.

In the Internet mode, the video portion of the television program last viewed in the TV mode is displayed inarea42. As an option, a textual description of the program is displayed in anarea44 and information about the television program, i.e., program title, station name, and channel number are displayed in abanner49 underneath

areas

42 and44. A message is displayed at the top of anarea46 to prompt the viewer to select from a number of website names displayed inarea46 by moving acursor48 with arrow keys on the viewer input device. For example, if the television program is a serial television show, for example, “Married With Children,” the website names could be information related to the show. After a website name is selected, the viewer presses a button on the viewer input device. As a result, the website address to which the selected website name is linked is retrieved frommemory36 bymicroprocessor24 and sent through the telephone or cable interface toInternet service provider33. (If desired, this function ofmicroprocessor24 could be carried out by commercial equipment sold under the trademark WEB TV.) The information at the addressed website is downloaded fromInternet service provider33 overlink34 tomicroprocessor24 and then displayed on the screen simultaneously with the television program to which the information relates, as illustrated inFIG. 3, after being composed byvideo processor30. As illustrated inFIG. 3, the name of the website can be displayed above the text of the information from the website. If the television program is a serial television show, as previously stated, the displayed information could include information about the episode, cast biographies, and trivia related to the show. The viewer then navigates about the website in the manner dictated by the viewer's software to find the desired information.

An alternative layout of the television screen for the present invention is shown inFIG. 4. In this layout, the television program is displayed in amajority portion60 of the screen while the PRI is displayed along twoborder regions62. The Web page including the PRI can be specifically configured to display the PRI in the border regions and an area designated for the real time image in the PIP. ThePIP circuitry19 is specially configured to a smaller reduction ratio, for example 1.5:1 rather than 3:1 for a standard PIP, in order to produce the larger PIP display.

Thescreen portion60 displays a television program consisting of moving images. Referring back toFIG. 1, when the viewer interacts with the website data or other PRI displayed on the television screen, the viewer's attention is diverted from the television program being shown to the website data. The viewer is then missing what is happening in the television program until the viewer's interaction with the PRI is concluded. To overcome this situation, an additional component, Storage Device52, described above, is added to the system to “time-shift” the display of the television program. As the television signal is being received byTuner11, the signal is forwarded throughIF Amp12 andPicture DET13 toVCR17. The VCR sends the signal through an analog to digital converter (A/D)50 to Storage Device52. The Storage Device is under the control of theMicroprocessor24 and is capable of storing the incoming television signal in real-time as digital information for future use.

As the television signal is being stored, if a viewer wants to interact with the PRI such as website data or other textual information being displayed on the television screen, the viewer sends a command to themicroprocessor24 via theviewer input device28. The viewer action to send the command could, for example, consist of pushing a button on the viewer input device. In response, themicroprocessor24

controls VCR

17 to output the television signal to the Storage Device52 which begins storing the television signal, including the PRI information embedded in the VBI. The Storage Device52 simultaneously outputs the first stored frame of the video signal to the signal processing unit for extended display ontelevision32. Thetelevision32 continues to display this frame until controlled by the viewer to continue without effect on any viewer activity with the PRI shown in the remainder of the display screen. The viewer then interacts with the PRI as described above.

When the viewer is done interacting with the PRI, the viewer sends a command to themicroprocessor24 to resume display of the television program. However, instead of displaying the incoming television signal fromTuner11, the VCR directs the delivery of the stored television signal data output from the READ head of Storage Device52 through Digital-to-Analog Converter (D/A)54 andSW18 toPIP19 for display onTV20. The data displayed is that part of the television program immediately subsequent to the point of suspension. That is, it has been time-shifted. The incoming television signal data continues to be stored by the WRITE head of the Storage Device52 in a time-ordered manner regardless of the functioning of the READ head. In other words, when display of the television program is to be suspended, the READ head is kept in the same position until a resume command is received. The WRITE head, however, keeps moving to record the incoming television signal data. Hence, at this time the data being stored is not the same data that is being displayed; there is a time lag between the two sets of data. In this manner, the viewer may continue watching the program without losing continuity of the program or PRI content. The viewer can position a cursor and enter input to freeze the display of the television program image on command.

In another embodiment, the PRI is contained on several web pages, each corresponding to a particular portion of the program and transmitted chronologically throughout the duration of the program. The television signal including the embedded website addresses is stored on the Storage Device52 and hence the corresponding Web pages remain linked to the appropriate portion of the television program as the signal is read out from the Storage Device52 after a “pause” operation. In this manner, the viewer may continue watching the program without losing continuity of the program or PRI content.

The audio portion of the television signal is also stored in the Storage Device along with the video portion. When the live television program is put into a “freeze” frame state, the audio portion of the television program is also suspended and not transmitted to the viewer. Instead, the audio portion is stored. When display of the suspended television program is resumed, the audio data is obtained from the Storage Device along with the video portion and forwarded byVCR17 throughSound Amp15 andloudspeaker16 to the viewer.

In another embodiment, the television signal is already in digital form, such as for high-definition digital television (HDTV). Therefore, an analog to digital conversion is unnecessary. The Storage Device continuously stores the television signal in a wraparound fashion whenever the system is operational, overwriting the oldest previously stored television signal data when the Storage Device becomes full. The Storage Device should be large enough to hold two to three hours of television programming before overwriting earlier broadcast television signal data.

The present invention allows a viewer to interrupt his or her viewing of a television program to interact with PRI carried in the VBI of the television signal and displayed on the television screen, and yet rejoin the television program at a later point in time without missing any of the program.

In another embodiment, the display of the incoming television signal may be suspended automatically by inserting a suspend flag into the VBI, rather than by an explicit action by the viewer. When the suspend flag is detected by themicroprocessor24 after decoding byVBI decoder35, the microprocessor instructs the VCR via a control link (not shown) to suspend the current display of the television signal. Resumption of display of the television program is commenced by viewer input. The viewer could also override the automatic suspension feature provided by the suspend flag by setting a predetermined control value to override all automatic suspend flags, or by entering viewer input when the suspension activity occurs in order to rapidly rejoin the television program in progress. Alternatively, a resume flag is inserted into the VBI at a predetermined time after the suspend flag. When the resume flag is received, the microprocessor automatically controls the VCR to resume display of the television program.

According to yet another embodiment, the viewer may access the information as any other storage media, such as a video tape, and pause, rewind, or fast forward to different portions of the program stored on the disc after the initially “pause” command. It may be desirable to continuously record the program on the time-shiftingapparatus46 regardless of a viewer “pause” command to allow for these functions over a period of time, limited only by the storage capacity of the time-shifting device.

Text-enhanced television programs incorporate program-related information (PRI) consisting of text and graphics which may be displayed simultaneously with the regular video portion of the television program in an enhancement mode. For example, the enhancement mode of one type of text-enhanced television program consists of a display with the video portion of the program in a picture-in-picture (PIP) window and textual information and/or graphics, also referred to as the “enhancements,” in the remaining portion of the display area of the television screen.

Typically, the enhancements are inserted into the vertical blanking interval (VBI) of the television signal and transmitted simultaneously with the video signal. The enhancements may also be transmitted synchronously with, but separate from the video portion, e.g., via an interface device such as a telephone or cable modem. The enhancements may include cast members' biographies, trivia about the show, information relating to the particular episode or scene, and closeups of information that cannot be readily seen or is hidden in the video portion of the program.

To provide maximum flexibility in the use of the invention with various hardware configurations various embodiments of the invention incorporate menu selection. Enhanced information displayed with a video signal that utilizes picture in picture technology requires a more sophisticated and flexible programming interface than is typically available on the front panel of the television or through the remote control device. Such a enhanced display is particularly amenable to the use of an interface such as an electronic program guide (EPG). EPGs are used to view program listings, supplemental information and to facilitate the recording of television broadcasts as well as any other function that may be programmed into the guide. These guides provide a flexible means of implementing the features of the present invention in addition to the other functions enumerated. Such a guide is described in PCT Publication No. WO 99/04561, published Jan. 28, 1999, the disclosure of which is incorporated fully herein by reference.

Enhancements that convey information may be taken directly from the Internet, such as in WebTV. WebTV allows the enhancements to be displayed on the screen as previously described. However, the enhancements are web pages that are taken from the Internet and displayed on the television screen in coordination with the televised programming. These enhancements may be automatically displayed when triggered by the television program, or they may remain hidden until the viewer initiates their display. The web pages displayed may remain in place till the viewer makes a new selection, or the web pages displayed may change when triggered by a new web page address sent along with the video signal.

Some enhancements may be time dependent on the program. For example, the enhancements may change to correspond to a particular scene or frame of the television program, such as in the exemplary screen of an enhanced television program shown inFIG. 5. The display includes avideo portion510 in a PIP window514, depicting a scene in which two characters are playing poker, and anenhancement portion516. The enhancement portion includes aquery518 about the rules of poker and acloseup520 showing each player's hand at that particular time, which is shown on aclock522 to be 8:40 pm.

FIG. 6 shows a later frame of the same scene, 8:43 pm according toclock522. The players have exchanged cards and their new card hands are shown incloseup area520. Theenhancement portion516 also includes ananswer524 to query518 ofFIG. 5.

With so much information on the screen, some of which is changing at a fairly rapid pace, it is desirable to provide the viewer the option of pausing a particular frame of a text-enhanced program display and then resume viewing the program without losing continuity of the video and enhancement portions of the program or program content.

For example, if the viewer desires to spend some time viewing the web page information displayed it is desirable to freeze the television program being viewed in the PIP window, while the viewer peruses the web information on the main screen. However, in the current state of the art if the viewer freezes the frame, or closes the PIP window, of the television program he will miss programming broadcast during the time he spent viewing the web pages. Thus, it is desirable to provide a buffer circuit that will store the received broadcast from the time the frame was frozen. The result is that the viewer will resume viewing a time shifted program from the point where he became distracted.

FIG. 7 shows an apparatus that will implement time-shifting of the television program and PRI. If the PRI automatically triggers the display of a web page it is desirable to delay the triggering of this data's display so as not to disturb the viewers perusal of the web page currently displayed. InFIG. 7 the time-shiftingapparatus746 receives the composite video signal containing supplemental data or web page locations to control sequencing and accessing web data through theInternet access provider760. In the normal viewing mode the time-shifting apparatus is either bypassed with aswitch740 or, alternatively by passing the data through the time-shifting device without delay being introduced.

The time-shifting apparatus is typically configured as a first-in first-out (FIFO) buffer. FIFO buffers are readily available as semiconductor devices. The state of the art in FIFO design has advanced to such a point where large quantities of data may be stored economically in the semiconductor devices. Up to seven hours of video data may be stored in this manner.

A FIFO memory chip stores data in binary form. A digital television signal is easily and directly stored in a FIFO memory buffer without additional signal processing. The FIFO of the time-shifting apparatus is configured such that each picture frame is stored at an address location in the buffering chip. When the readout of the memory is commanded this occurs frame-by-frame.

In the case of the television signal being a conventional analog or NTSC signal the time-shifting apparatus must first digitize the received channel so that it may be stored in digital form. Digitization is accomplished with A/D converters that convert an analog signal to a series of samples whose magnitudes are quantified as a number, typically binary. However, the quantification may be done in any convenient base, as will be appreciated by those skilled in the art

In alternative embodiments of the invention multiple tuners and time-shifting apparatus may be provided so that a user may program several alternatives for an evening's viewing of different channels, and view them in an uninterrupted manner when switching among channels. In this manner if the next show to be viewed that has been time shifted proves uninteresting, one or more time shifted alternative programs is available. If multiple time shift devices are available for each programed channel the viewer can back up to the beginning of the tine slot and switch to an alternate program without missing the beginning. Alternatively, a signal tuner may be preprogrammed to tune to various channels at various times thus providing a continuous signal to a single time-shifting apparatus for time shifted viewing of a preprogrammed series of programs.

In an embodiment of the time-shifting apparatus the FIFO may consist of EEPROMS. These are memory chips that are electrically erasable programmable read-only memories (EEPROMS). These memory devices have an internal switch on the chip that permits the user to electrically rewrite new contents into the memory when desired. These circuits provide nonvolatile and re-programmable random word access memory.

In alternative embodiments of the invention the time-shifting apparatus may also supplement its memory capacity by using secondary memory. High capacity memory that has a slower access speed has been traditionally provided by disk drives and tape drives as secondary memory. These secondary memory options may be used alone to provide time-shifting of programming or may be used in conjunction with semiconductor buffers. The semiconductor buffers may be used to provide a small time period of storage with the secondary memory being used to augment the capacity of the semiconductor memory. The amount to which secondary memory use is desirable in a system is dependent upon the cost and performance trade offs required in the design, and will be readily appreciated by those skilled in the art of electronic design.

Recently optical recording has been replacing magnetic storage media. They may be used as a disposable media. Once the disk is full it is discarded. A laser beam is used to burn pits in the recording media that represent bits of information. A lower power laser beam is used to sense the presence or absence of pits in reading the disk. However, this media is not inherently erasable and discarding the disk is undesirable, unless one is provided with large capacity.

Alternative embodiments utilize erasable optical disks. These disks utilize magneto optic technology. In this technology a magnetic domain of approximately 1 μm in diameter is switched up or down by an external magnetic field after application of a laser beam that heats the domain reducing its coercivity, thus allowing the domain to flip state. The disk is read by a low power polarized laser beam that is rotated slightly depending upon whether the domain is magnetized up or down.

FIFOs may be alternatively provided by semiconductor bubble memory devices. These are chips but differ from other semiconductor memories by utilizing magnetic devices. In these devices the presence of absence of a magnetic domain is the basis for reading a binary 1 or 0. These memories are compact and extremely fast.

According to one embodiment of the invention, a television system is provided which allows a viewer of a text-enhanced television program to pause the program at a particular frame, browse the enhancements at his or her leisure, and then resume viewing the program from that frame, without losing continuity of the video and enhancement portions of the program or program content.

When viewing a time shifted program that is being played back through the buffer a subscriber may wish to fast forward through the time shifted program so that its ending time will roughly correspond to the end time that was originally scheduled. This may be achieved in several ways. To do this an embodiment allows the frames to be played back at a faster rate than is normal is utilized, with or without audio. In a further alternate embodiment the rate of frame playback is kept the same. However one or more frames are skipped during the playback. When skipping frames the supplemental data or web addresses that correspond to a skipped frame are either assigned to the previous or preceding frame, so that the web address is not lost. In a further alternate embodiment play back is sped up by eliminating commercials and station breaks that are provided with markers that indicate when skipping should occur.

The viewer may also introduce markers in alternative embodiments of the invention. By pushing a button on the remote a marker is introduced where the viewer desires, such as where he desires to begin perusing web information. A marker may also be introduced when he finishes to mark where the viewer's attention returned to the television program. Rapid frame advance may be used between these markers to determine if anything good has been missed, or to go back to where the viewer lost the plot and begin watching from that point.

In an embodiment illustrated inFIG. 7, the enhancements are inserted into the VBI of the television signal and are synchronized with the video portion of the signal. Amicroprocessor730 controls a signal processing unit for extracting the enhancement information from the VBI and processing both the video signal and enhancement information for display on atelevision732. The signal processing unit includes a VBI decoder/slicer734, an IFamp736, and aPIP generator738.

The microprocessor also controls aswitch740. The television signal is input to the switch directly from atuner744. The microprocessor controls the switch to route the television signal directly to the signal processing unit, or to a time-shiftingapparatus746.

An exemplary time-shifting apparatus is described in application Ser. No. 08/475,395 filed on Jun. 6, 1995, and PCT Publication No. WO 98/48566 published Oct. 20, 1998, the disclosures of which are incorporated fully herein by reference.

One such exemplary time-shifting apparatus is disclosed in U.S. patent application Ser. No. 08/388,345 to Russo, et al. filed Feb. 14, 1995, which is fully incorporated herein. Such a time-shifting apparatus includes an optical disc for storage of video programs and separate READ and WRITE heads which operate simultaneously such that real time program information can be stored on the disc while previously stored information on the disc can be read and output to the television signal for display.

Another type of time-shifting apparatus is disclosed in U.S. Pat. No. 5,241,428 to Goldwasser, which is also fully incorporate herein. Any time-shifting apparatus capable of simultaneously storing new information and outputting previously stored information for display is acceptable for use with the various embodiments of the invention.

When the viewer presses a “PAUSE” button (not shown) on aremote controller748, theremote controller748 sends a command signal via anIR transmitter750 to theIR receiver752 ofmicroprocessor730.

In response, themicroprocessor730 controls switch740 to output the television signal to time-shiftingapparatus740 which begins storing the television signal, including the enhancement information embedded in the VBI. The time-shifting apparatus simultaneously outputs the first stored frame of the video signal to the signal processing unit for extended display ontelevision732. Thetelevision732 continues to display this frame until controlled by the viewer to continue. When the viewer wishes to resume viewing the program, the viewer presses a “PLAY” button (not shown) on the remote controller which in turn commands the micro-controller to control the time-shifting apparatus to begin reading the stored program from the point of the paused frame, while simultaneously continuing to record the real time broadcast television signal. In this manner, the viewer may continue watching the program without losing continuity of the program or program content.

FIG. 8 is a time plot illustrating an exemplary “pause” operation.FIG. 8 represents system operations from 8:30 pm to 8:45 pm. From 8:30 pm to 8:40 pm, the viewer watches a text-enhanced television program in real time. At 8:40 pm, the viewer pauses the program, at which time the time-shifting apparatus begins recording the real time broadcast signal and outputs the first stored frame for display on thetelevision32. At 8:45 pm, the viewer controls the system to resume the program at which time the first frame is played back at the desired rate. As shown inFIG. 9, which depicts systems operations from 8:30 pm to 8:50 pm. between 8:40 pm and 8:50 pm, the television has displayed the portion of the program broadcast between 8:40 and 8:45 and the time-shifting apparatus has stored the portion of the program broadcast between 8:40 pm and 8:50 pm.

In another embodiment, the microprocessor is connected to an Internet access provider760 (FIG. 7). According to this embodiment, the enhancement portion of the television signal includes an Internet site and/or world wide web site addresses which may be displayed on the screen and accessed in an interactive manner by the viewer. The actual Internet site address may be displayed on the screen or a representative icon or name for the site. In this manner, the enhancement information transmitted with the video portion of the program may be linked to related Internet sites. The viewer may access such Internet links from the enhancement portion of the television display at any time the link is shown, even while paused. The Internet sites accessed from the enhancements may be themselves linked to other Internet or web sites.

In a further embodiment, the enhancement information includes internal links. For example, inFIG. 6, answer524 may be linked to query518 such that when the viewer selectsanswer524 with a cursor (not shown),query518 would reappear, e.g., in order to remind the viewer what the question was. In this embodiment, themicroprocessor730 is connected to a RAM762 (FIG. 7). The real time broadcast signal is continuously routed to the microprocessor and all enhancement information extracted from the VBI is stored in the RAM, regardless of whether or not the time-shiftingapparatus746 is operating, as illustrated inFIG. 10. Thus, while watching a time shifted text-enhanced program, the viewer is able to link to enhancement information broadcast prior or subsequent to the particular frame currently displayed.

Alternatively, all enhancement information may be transmitted en masse at the beginning of the program and stored in the RAM for future reference.

In alternative embodiments the enhancements to the television signal may be transmitted by other means than the vertical blanking interval (VBI). The television signal would contain a trigger signal to initiate the transmission of information. Such a signal typically consists of pilot tones in the case of analog transmission, or a digital preamble in the case of a HDTV signal being digitally modulated. This information thus triggered may be transmitted over a modem connected to the microprocessor or via a wireless communications link, such as by a pager, cellular telephone, or cordless telephone. Additionally the supplemental information may be stored in thememory762 for use at a later time.

In alternative embodiments the television signal may be provided by an Internet access provider. Such an Internet service provider (ISP) may also include supplemental information in the form of web addresses. In this case a back-link may be provided through a modem, cordless telephone, pager, or cellular telephone to control time shifted playback of the television signal.

When an ISP is part of the system configuration the ISP's server may be utilized as a primary or secondary storage location of time shifted programming. Received programming that has been digitized may be sent over a back link to the ISP for storage and subsequent retrieval by the viewer from the server.

In an alternative embodiment, if streaming video is being broadcast over the Internet then the bit stream may be routed through the time-shifting buffer to realize the same benefits as previously described. In this embodiment the shifting of the buffer is used to augment the time-shifting capabilities of the streaming technology.

Although the present invention has been described with respect to particular embodiments, those skilled in the art will appreciate that the present invention may be modified without departing from the scope of the invention. Accordingly, all such modifications are intended to be included within the scope of the invention as defined by the following claims.

Claims

1-31. (canceled)

32. A method comprising:

displaying a video received over a video signal on a user device;

receiving a trigger over the video signal; and

launching an application related to the video on the user device in response to receiving the trigger.

33. The method ofclaim 32 wherein the video signal is a television signal, and wherein the trigger is received in the VBI of the television signal.

34. The method ofclaim 32 further comprising pausing the video in response to receiving the trigger.

35. The method ofclaim 34 wherein the video is a real-time program.

36. The method ofclaim 35 wherein pausing the video comprises:

receiving a first plurality of portions of the real-time program that are later in time relative to the paused real-time program location; and

storing the first plurality of portions as they are received.

37. The method ofclaim 36 further comprising:

receiving an unpause command;

retrieving the first plurality of stored portions of the real-time program that are later in time relative to the paused real-time program location; and

displaying the first plurality of retrieved stored portions.

38. The method ofclaim 37 further comprising:

storing a second plurality of portions of the real-time program that are later in time relative to the first plurality of retrieved portions, wherein the first plurality of stored portions is retrieved simultaneously with the storing of the second plurality of portions.

39. The method ofclaim 34 further comprising:

receiving another trigger in the video signal;

resuming playback of the paused video in response to receiving the other trigger, wherein playback is resumed from a point in time at which the video was paused; and

terminating the launched application in response to receiving the other trigger.

40. The method ofclaim 32, further comprising accessing a webpage that includes information about the video in a web browser, wherein launching the application comprises launching the web browser on the device.

41. The method ofclaim 40 wherein the video is a television program and the webpage information comprises at least one of cast members' biographies, trivia about the program, information relating to a particular episode or scene of the program, and close-ups of information that are hidden in the displayed program.

42. The method ofclaim 32 wherein launching the application comprises providing access to the application simultaneously while displaying the video.

43. The method ofclaim 42 wherein information associated with the application and the video are displayed in separate screens on the user device.

44. The method ofclaim 43 wherein the video is a real-time program, further comprising:

pausing the real-time program in response to receiving the trigger,

wherein access to the application is provided simultaneously while displaying a single frame of the real-time program.

45. The method ofclaim 32 wherein launching the application comprises:

establishing an Internet connection with a remote host;

receiving information related to the real-time video from the remote host over the Internet connection; and

displaying the information received from the remote host.

46. A system comprising:

a display screen for displaying a video received over a video signal on a user device; and

control circuitry configured to:

receive a trigger over the video signal; and

launch an application related to the video on the user device in response to receiving the trigger.

47. The system ofclaim 46 wherein the video signal is a television signal, and wherein the trigger is received in the VBI of the television signal.

48. The system ofclaim 46 wherein the control circuitry is further configured to pause the video in response to receiving the trigger.

49. The system ofclaim 48 wherein the video is a real-time program.

50. The system ofclaim 49 wherein the control circuitry is further configured to:

receive a first plurality of portions of the real-time program that are later in time relative to the paused real-time program location; and

store the first plurality of portions as they are received.

51. The system ofclaim 50 wherein the control circuitry is further configured to:

receive an unpause command;

retrieve the first plurality of stored portions of the real-time program that are later in time relative to the paused real-time program location; and

display on the display screen the first plurality of retrieved stored portions.

52. The system ofclaim 51 wherein the control circuitry is further configured to:

store a second plurality of portions of the real-time program that are later in time relative to the first plurality of retrieved portions, wherein the first plurality of stored portions is retrieved simultaneously with the storing of the second plurality of portions.

53. The system ofclaim 48 wherein the control circuitry is further configured to:

receive another trigger in the video signal;

resume playback of the paused video in response to receiving the other trigger, wherein playback is resumed from a point in time at which the video was paused; and

terminate the launched application in response to receiving the other trigger.

54. The system ofclaim 46, wherein the control circuitry is further configured to:

access a webpage that includes information about the video in a web browser; and

launch the web browser on the device.

55. The system ofclaim 54 wherein the video is a television program and the webpage information comprises at least one of cast members' biographies, trivia about the program, information relating to a particular episode or scene of the program, and close-ups of information that are hidden in the displayed program.

56. The system ofclaim 46 wherein the control circuitry is further configured to provide access to the application simultaneously while displaying the video.

57. The system ofclaim 56 wherein information associated with the application and the video are displayed in separate screens on the display screen.

58. The system ofclaim 57 wherein the video is a real-time program, and wherein the control circuitry is further configured to:

pause the real-time program in response to receiving the trigger; and

provide access to the application simultaneously while displaying a single frame of the real-time program.

59. The system ofclaim 46 wherein the control circuitry is further configured to:

establish an Internet connection with a remote host;

receive information related to the real-time video from the remote host over the Internet connection; and

display on the display screen the information received from the remote host.