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WO1998008340A1 - Procedes de diffusion d'evenements de programmation de television - Google Patents

Procedes de diffusion d'evenements de programmation de television Download PDF

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Publication number
WO1998008340A1
WO1998008340A1 PCT/US1997/014867 US9714867W WO9808340A1 WO 1998008340 A1 WO1998008340 A1 WO 1998008340A1 US 9714867 W US9714867 W US 9714867W WO 9808340 A1 WO9808340 A1 WO 9808340A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
programming event
presentation
format
television
Prior art date
Application number
PCT/US1997/014867
Other languages
English (en)
Other versions
WO1998008340A9 (fr
Inventor
Mark F. Guntrum
Original Assignee
Guntrum Mark F
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guntrum Mark F filed Critical Guntrum Mark F
Priority to AU42348/97A priority Critical patent/AU4234897A/en
Publication of WO1998008340A1 publication Critical patent/WO1998008340A1/fr
Publication of WO1998008340A9 publication Critical patent/WO1998008340A9/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H04N7/0117—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal
    • H04N7/0122—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving conversion of the spatial resolution of the incoming video signal the input and the output signals having different aspect ratios
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/002—Special television systems not provided for by H04N7/007 - H04N7/18
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof

Definitions

  • the invention pertains to the field of television programming distribution.
  • a variety of methods and technologies are known for originating electrical signals which represent the sounds and images of television programming events.
  • Prerecorded programming events stored on storage media such as video tape, computer disk or laser disc may be played using known production equipment to generate signals representing the stored programming event.
  • the sounds and images of live programming events may be translated into electrical signals using cameras and associated known production equipment.
  • Current technology offers the ability to synchronize the origination of multiple signals which represent the same programming event .
  • Current known representation formats include NTSC, PAL and SECAM (standard analog formats) , HDTV (a standard high definition television format) , and MPEG2 (standard digital video encryption format) .
  • Current technology further includes a variety of methods and technologies for distributing television programming events to television receivers. Electrical signals representing television programming events may be distributed to receivers through a variety of known distribution means which may be categorized as either broadcast transmission, wherein a signal is made available for all receivers having broadcast receiving capability, or direct transmission, where a signal is specifically provided only to selected receivers . Examples of broadcast transmission include television band broadcast, satellite broadcast, cable broadcast, and wireless cable broadcast . Examples of direct transmission included transmission over dedicated lines such as telephone lines, and direct transmission in a connectionless environment such as a client/server data distribution network.
  • the invention in general terms employs known signal origination and distribution technology in a novel manner to facilitate comparative viewing of a programming event in alternative "presentation formats". In general terms, this is achieved by providing synchronized or chronologically continuous presentations of a single programming event in alternative presentation formats such that a television viewer can alternately receive and view the programming event in each of the alternative presentation formats. The viewer may thus alternate his viewing to make a comparison between the alternative presentation formats, for example, by alternating the channel of reception of his receiver.
  • presentation format is one which originates with the applicant.
  • Presentation formats are to be understood as ways of presenting a programming event. More specifically, a presentation format is a manner of presenting a programming event using a combination of presentation format variables.
  • presentation format variable which will be used to exemplify the invention further below is the aspect ratio of the field of view.
  • a feature-length cinematic production may have been originally produced using one of the many various "wide screen” cinematic aspect ratios. The production may thus be stored on video tape in a "letter box" format which reproduces the aspect ratio of the original production.
  • the movie may be stored in a "panned and scanned" format which reduces the aspect ratio to 4:3 (the aspect ratio of NTSC television) by omitting content at the right and/or left edges of the picture .
  • these two presentations of the programming event employ alternative presentation formats which differ with respect to the aspect ratio of the field of view.
  • a "live" programming event may similarly be originated and stored or distributed using a 16:9 aspect ratio (the proposed aspect ratio for HDTV) or a 4:3 aspect ratio (the aspect ratio of NTSC television) , depending upon the choice of camera and other production equipment.
  • presentation format variables include color (black and white, color, or “colorized”), dimensional presentation (two- dimensional or three-dimensional) , and audio presentation (monophonic, stereophonic, "surround- sound,” etc.) .
  • color black and white, color, or "colorized”
  • dimensional presentation two- dimensional or three-dimensional
  • audio presentation monoophonic, stereophonic, "surround- sound,” etc.
  • Figure 1 depicts first and second substantially synchronized signals representing a programming event in alternative presentation formats transmitted from a signal originator to a signal distributor;
  • Figure 2 depicts first and second substantially synchronized signals representing a programming event in alternative presentation formats transmitted from a signal distributor to a television receiver over two separate channels of a common transmission medium;
  • Figure 3 depicts the transmission over a single channel of a signal which alternately represents a programming event in a first and then a second presentation format such that the alternative presentations are provided so as to be substantially chronologically continuous.
  • PROGRAMMING EVENT A programming event is a collection of images and sounds associated with an occurrence .
  • a presentation format is a manner of presenting a programming event to a viewer which is determined by a combination of presentation format variables.
  • a presentation format variable is an aspect of a presentation format which may be varied to take one of alternative forms.
  • the specific value of a presentation format variable in a given presentation of a programming event is determined by the equipment and processes used to translate the sounds and images of the programming event into an electrical signal, the equipment and processes used to store the signal, and/or the equipment and processes used to originate the signal for distribution.
  • presentation format variables include aspect ratio, color (black and white, color, tinted, or "colorized"), dimensional presentation (two-dimensional or three- dimensional) and audio presentation (monophonic, stereophonic, "surround sound,” etc.).
  • SIGNAL ORIGINATOR A signal originator is a combination of devices and associated processes used to generate signals for distribution to receivers.
  • SIGNAL DISTRIBUTOR A signal distributor is a combination of devices and associated processes used to distribute signals over a transmission medium to receivers.
  • SUBSTANTIALLY SYNCHRONIZED Multiple presentations of a programming event are substantially synchronized when a given point within the programming event is represented in each of the multiple presentations at the same time, such that a meaningful comparison may be made between the portions of the programming event surrounding that point in each of the multiple presentations when the presentations are viewed alternately or simultaneously.
  • substantial synchronization may be achieved through reference to time codes associated with the presentation, such that the presentations may be commenced from the same point at the same time and presented at equal speeds. It will be recognized by those of ordinary skill in the art that the synchronization produced through this and other known methods may not be exact, but rather will be approximate within a range dictated by known and quantifiable variables.
  • the presentations would by nature be considered substantially synchronized absent the introduction of atypical delay into one or both of the signals.
  • a receiver receives a first signal presenting a programming event in a first presentation format, and then a second signal presenting the same programming event in a second presentation format
  • the presentation in the second presentation format is considered to be substantially chronologically continuous with the presentation in the first presentation format where the portion of the programming event represented by the second signal follows chronologically the portion of the programming event represented by the first signal such that the chronological shift between the portions represented by the respective signals is insubstantial, allowing a meaningful comparison to be made between the presentation formats of each presentation.
  • TELEVISION RECEIVER The term "television receiver” is broadly used to encompass known equipment for receiving signals representative of programming events transmitted to the receiver from a remote point of origin and for facilitating the display of the programming event represented by the received signal .
  • a television receiver may for example comprise a standard NTSC television, a personal computer, or a set top processor used as an interface for receiving and translating incoming signals (commonly referred to as a "set top box”) .
  • Television receivers are characterized by a user interface through which a user controls the display of programming events.
  • a representation format is a standardized signal and/or storage format for representing programming conten .
  • a representation format may produce an analog representation, such as the existing NTSC, SECAM and PAL formats, or a digital representation such as the HDTV or MPEG2 formats.
  • CHANNEL The term "channel" is broadly used to describe one of alternative carrier wave bands within a broadcast spectrum which is recognized by a television receiver as a band which is designated for conveying single programming events .
  • Figure 1 illustrates a first example of a method embodying the invention in which a signal originator provides television programming signals to a signal distributor 106 for distribution to television viewers.
  • the signal originator 100 originates first 102 and second 104 continuous signals which each represent the same programming event.
  • the signal originator may be a combination of equipment and processes used by a single entity such as a television broadcasting company to produce the two illustrated signals.
  • the signal originator may be the combination of equipment and processes used by two separate entities such as two independent television broadcasting companies which together result in the production of the two illustrated signals.
  • the signals 102 and 104 are provided to the distributor 106 in the same representation format, which may for example be NTSC, PAL, SECAM, HDTV, or MPEG2.
  • the signals may be originated from prerecorded sources such as video tape or laser disc, or from cameras if the programming event is occurring live.
  • the first signal 102 and the second signal 104 both represent the same programming event but present the programming event in alternative presentation formats .
  • the first signal presents the programming event with a field of view 108 having a 4:3 aspect ratio
  • the second signal presents the programming event with a field of view 110 having an aspect ratio of 16:9.
  • the presentations are substantially synchronized. Specifically, by comparing the image represented by a portion A of the first signal and a portion B of the second signal, where each portion exists at the same period along a programming event transmission time line, it is seen that the portions of the programming event represented by portions A and B are essentially the same. Thus the two presentations are substantially synchronized.
  • Figure 2 illustrates a second example of a method embodying the invention in which a signal distributor 106 provides television programming signals to a television receiver 200 at a remote location for viewing by a television viewer.
  • the signal distributor 106 provides first 202 and second 204 continuous signals which each represent the same programming event.
  • the signal distributor 106 may for example be a television broadcast tower, a cable head end, or a broadcast satellite .
  • the illustrated signals 202 and 204 are provided in the same representation format, which may for example be NTSC, SECAM, PAL, HDTV, or MPEG2.
  • the signals may simply be relayed from a signal originator as described above.
  • the signal distributor 106 may also perform the function of signal originator, in which case the signals may be provided from prerecorded sources such as video tape or laser disc, or from cameras if the event is occurring live.
  • the first signal and the second signal represent the same programming event but present the programming event in alternative presentation formats.
  • the first signal presents the programming event with a field of view 206 having a 4:3 aspect ratio
  • the second signal presents the programming event with a field of view 208 having an aspect ratio of 16:9.
  • the presentations are substantially synchronized. Specifically, by comparing the image represented by a portion A of the first signal and a portion B of the second signal, where each portion exists at the same period along the programming event transmission time line, it is seen that the portions of the programming event represented by portions A and B are essentially the same. Thus the two presentations are substantially synchronized.
  • the signals of Figure 2 are provided on different channels 210 and 212 of a common communication medium 214.
  • the communication medium could be the television broadcast band, the satellite broadcast band, a cable broadcast system, a wireless cable broadcast system, or another similar medium.
  • the signals may be received and decoded by a television receiver having the capability of receiving and decoding signals provided through that medium.
  • Figure 3 illustrates a third example of a method embodying the invention involving a direct signal distributor 106 such as an interactive cable provider or a computer data server.
  • the signal distributor 106 must be capable of providing a first signal 300 and a second signal 302 which each represent a programming event.
  • the distribution is direct, only one of the signals needs to be provided to the receiver 304 at a time.
  • the signals 300 and 302 may be in either analog or digital form, using any of the many known presentation formats such as NTSC, PAL, SECAM, HDTV or MPEG2.
  • the signals may simply be relayed from a signal originator as described above.
  • the signal distributor may also act as signal originator, in which case the signals may be provided from prerecorded sources such as video tape or laser disc, or from cameras if the event is occurring live.
  • the signal distributor 106 initially provides a first signal 300 representative of the programming event in a first presentation format. However, responsive to a receiver command to provide alternate programming, the signal distributor 106 substitutes for the first signal 300 a second signal 302 which presents the programming event in a second presentation format.
  • the signal 302 representing the programming event in the second presentation format is provided in such a manner that the presentation of the first signal and the presentation of the second signal are substantially chronologically continuous.
  • the first signal presents the programming event with a field of view having a 4:3 aspect ratio
  • the second signal presents the programming event with a field of view having an aspect ratio of 16:9.
  • the presentations are substantially chronologically continuous. Specifically, by comparing the image represented by a portion A of the first signal and a portion B of the second signal, where portion B follows portion A along the programming event transmission time line, it is seen that the portions of the programming event represented by portions A and B are essentially the same. Thus the two presentations are substantially chronologically continuous .
  • the signal distributor produces two substantially synchronized signals representing the programming event in two alternative presentation formats but only distributes one at a time in accordance with a viewer selection, a change from one signal to the other will provide a substantially chronologically continuous presentation unless substantial delay is introduced.
  • substantial chronological continuity may be achieved through reference to the time codes which are included in the representation format.
  • multiple presentations will by default be substantially chronologically continuous absent the introduction of substantial delay into one or both of the signals.
  • the invention in general terms involves providing substantially synchronized or substantially chronologically continuous presentations of a single programming event in alternative presentation formats such that a television viewer can alternately view the programming event in each of the alternative presentation formats, such as by switching the channel of reception of his receiver.
  • the invention may be employed to facilitate contemporaneous reception and comparative viewing of a wide range of alternative presentation formats, and may be practiced in association with various known production techniques to illustrate the comparative ability of various presentation formats to enhance the range of production options made available by each presentation format.
  • the following examples illustrate various manners in which the invention may be practiced.
  • Example 1 The programming event is a cinematic production.
  • a first version of the programming event is stored on video tape in an NTSC "letter box” presentation format which preserves the 2.35:1 "Cinemascope" aspect ratio of the original production.
  • a second version of the programming event is stored on video tape in a "panned and scanned" NTSC presentation format which limits the aspect ratio to 4:3 (1.33:1) by omitting content from the right and/or left edges of the original field of view.
  • First and second signals are originated by playing the two versions of the programming event simultaneously and substantially in synchronization using known devices and methods. The resulting signals are routed through standard production and transmission equipment to broadcast transmitters which transmit on different channels within the television broadcast band.
  • the two alternative presentations of the programming event are therefore receivable on a standard NTSC television receiver.
  • a viewer using the receiver may view each presentation of the programming event alternately by switching the reception of his receiver between the channels on which the presentations are transmitted, or may view the alternative presentation formats together if two television receivers are available or if the viewer's receiver has "picture-in-picture" capability.
  • Example 2 The programming event is a live ice hockey game.
  • a single camera positioned above and to the side of the playing surface at approximately center ice follows the play from side to side and captures the event in a 16:9 aspect ratio format .
  • Standard production equipment processes the signal from the camera to originate a first signal in an NTSC "letter box" format which preserves the 16:9 aspect ratio of the field of view.
  • a second signal in a 4:3 NTSC format is originated by omitting content from the right and/or left edges of the original 16:9 field of view.
  • the two signals are routed through standard production and transmission equipment to a cable systems operator who distributes each of the signals on separate standard cable television channels in NTSC format.
  • the two alternative presentations of the hockey game are therefore receivable by a standard cable-ready NTSC television receiver or a standard cable reception decoder box.
  • a viewer using such receiving equipment may view each presentation of the game alternately by switching between the two channels, thus comparing the respective fields of view provided by the 4:3 and 16:9 aspect ratios.
  • Example 3 The programming event is a live baseball game.
  • a first camera captures the event from behind the pitcher such that the pitcher, catcher, and batter are visible.
  • a second camera captures the event from the side of the field near first base looking towards second base and will follow the motion of a base runner on first base who is expected to attempt to steal second base.
  • the first and second cameras capture the event in a 4:3 aspect ratio and the signals from the cameras are combined using known production techniques to originate a traditional "split-screen" view showing both the pitcher and the base runner.
  • a third camera captures the event from the side of the field at a point midway between first base and the outfield wall.
  • the third camera captures the event in a 16:9 aspect ratio which allows the pitcher, batter, catcher, base runner, and first and second bases to be shown across the width of the field of view.
  • the signal from the third camera is processed using known production equipment such that a signal is originated which provides a "letter box” presentation containing the entire field of view captured by the third camera.
  • First and second signals representing the "split-screen” and “letter box” views are routed through standard production and transmission equipment to a cable systems operator who distributes each of the signals on separate standard cable television channels. The two alternative presentations of the game are therefore receivable on a standard NTSC television receiver.
  • a viewer using the receiver may view each alternative presentation of the programming event alternately by switching between the two channels, thus comparing the respective fields of view provided by the 4:3 and 16:9 aspect ratios and the enhanced production options facilitated by the 16:9 aspect ratio.
  • the aspect ratio is a presentation format variable which serves to define alternative presentation formats.
  • the use of different cameras having different vantage points is considered to be a production variable, rather than a presentation variable.
  • the distinction is that the different camera angles represents ones of a continual stream of aesthetic choices as to how the programming event will be portrayed, whereas the presentation format is a static manner of presenting the sounds and images chosen in the course of production.
  • Example 4 Several broadcasters are presenting a Presidential debate for which several 30 second "commercial breaks" have been scheduled at predetermined times. Because the debate is a live event, the commercial breaks taken by each broadcaster will be substantially synchronized.
  • An advertiser provides a 30 second commercial advertisement to two broadcasters who are presenting the debate in the same representation format, for example, NTSC.
  • the commercial advertisement is the programming event.
  • the version of the advertisement given to a first broadcaster presents the advertisement in color in a 16:9 "letterbox format" with stereo surround sound.
  • the version of the advertisement given to a second broadcaster presents the advertisement in black and white in a 4:3 aspect ratio with monophonic sound.
  • Each broadcaster presents the advertisement during the same commercial break.
  • the two alternative presentations of the advertisement are therefore receivable by receivers capable of receiving the broadcaster's respective signals.
  • a viewer may view each of the advertisements alternately by switching between the channels of each broadcaster, thus comparing the respective fields of view provided by the 4:3 and

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Graphics (AREA)
  • Television Systems (AREA)

Abstract

Certains objectifs avantageux peuvent être atteints par la fourniture ou la mise à disposition, à des fins de comparaison, de présentations multiples d'un seul évènement de programmation qui sont fournies dans la même tranche de temps. Des technologies de production et de diffusion de signaux connus sont mises en oeuvre pour faciliter un visionnement comparatif d'un évènement de programmation dans différents formats de présentation (300 et 302). En général, cela est possible par la fourniture de présentations synchronisées ou chronologiquement continues d'un seul évènement de programmation dans différents formats de présentation (300 et 302) de sorte qu'un télespectateur puisse au choix recevoir et visionner l'évènement de programmation dans chacun des différents formats de présentation (300 et 302). Le télespectateur peut ainsi alterner son visionnement pour faire une comparaison entre les différents formats de présentation (300 et 302), par exemple en commutant la réception de son récepteur (304) entre les différents canaux sur lesquels les présentations sont émises, ou en visionnant les différents formats de présentation ensemble s'il dispose de deux récepteurs de télévision ou si son récepteur (304) permet l'incrustation d'une image.
PCT/US1997/014867 1996-08-23 1997-08-22 Procedes de diffusion d'evenements de programmation de television WO1998008340A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42348/97A AU4234897A (en) 1996-08-23 1997-08-22 Methods for distribution of television programming events

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69737896A 1996-08-23 1996-08-23
US08/697,378 1996-08-23

Publications (2)

Publication Number Publication Date
WO1998008340A1 true WO1998008340A1 (fr) 1998-02-26
WO1998008340A9 WO1998008340A9 (fr) 1998-04-23

Family

ID=24800915

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/014867 WO1998008340A1 (fr) 1996-08-23 1997-08-22 Procedes de diffusion d'evenements de programmation de television

Country Status (2)

Country Link
AU (1) AU4234897A (fr)
WO (1) WO1998008340A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2348586A (en) * 1997-03-11 2000-10-04 Actv Inc A digital interactive system for providing full interactivity with live programming events
GB2355136A (en) * 1997-03-11 2001-04-11 Actv Inc A switching unit for switching between received video signals
US7075899B2 (en) 2002-05-21 2006-07-11 Actv, Inc. System and method for providing private in-band data to digital set-top boxes in a broadcast environment
US7079176B1 (en) 1991-11-25 2006-07-18 Actv, Inc. Digital interactive system for providing full interactivity with live programming events
US7249365B1 (en) * 2002-01-31 2007-07-24 Keen Personal Media, Inc. System and method for ensuring presentation of embedded rich media across station boundaries
DE102006018251A1 (de) * 2006-04-15 2007-10-18 Wolfram Wagner System zur parallelen Wiedergabe von mehreren Filmen
US7305691B2 (en) 2001-05-07 2007-12-04 Actv, Inc. System and method for providing targeted programming outside of the home
US7448063B2 (en) 1991-11-25 2008-11-04 Actv, Inc. Digital interactive system for providing full interactivity with live programming events

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5231494A (en) * 1991-10-08 1993-07-27 General Instrument Corporation Selection of compressed television signals from single channel allocation based on viewer characteristics
US5631693A (en) * 1993-10-25 1997-05-20 Antec Corporation Method and apparatus for providing on demand services in a subscriber system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5231494A (en) * 1991-10-08 1993-07-27 General Instrument Corporation Selection of compressed television signals from single channel allocation based on viewer characteristics
US5631693A (en) * 1993-10-25 1997-05-20 Antec Corporation Method and apparatus for providing on demand services in a subscriber system

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7079176B1 (en) 1991-11-25 2006-07-18 Actv, Inc. Digital interactive system for providing full interactivity with live programming events
US7448063B2 (en) 1991-11-25 2008-11-04 Actv, Inc. Digital interactive system for providing full interactivity with live programming events
GB2355135A (en) * 1997-03-11 2001-04-11 Actv Inc A reception unit for switching between received video signals
GB2348586A (en) * 1997-03-11 2000-10-04 Actv Inc A digital interactive system for providing full interactivity with live programming events
GB2355137A (en) * 1997-03-11 2001-04-11 Actv Inc An interactive program reception unit for receiving and displaying video signals
GB2355136B (en) * 1997-03-11 2001-06-06 Actv Inc A switching unit for switching between received video signals
GB2355135B (en) * 1997-03-11 2001-06-06 Actv Inc A reception unit for switching between received video signals
GB2355137B (en) * 1997-03-11 2001-06-06 Actv Inc An interactive program reception unit for receiving and displaying video signals
GB2355136A (en) * 1997-03-11 2001-04-11 Actv Inc A switching unit for switching between received video signals
GB2348586B (en) * 1997-03-11 2001-03-07 Actv Inc A reception unit for switching between received video signals
US7305691B2 (en) 2001-05-07 2007-12-04 Actv, Inc. System and method for providing targeted programming outside of the home
US7249365B1 (en) * 2002-01-31 2007-07-24 Keen Personal Media, Inc. System and method for ensuring presentation of embedded rich media across station boundaries
US7075899B2 (en) 2002-05-21 2006-07-11 Actv, Inc. System and method for providing private in-band data to digital set-top boxes in a broadcast environment
DE102006018251A1 (de) * 2006-04-15 2007-10-18 Wolfram Wagner System zur parallelen Wiedergabe von mehreren Filmen

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