EP0672326A1 - Systemes de distribution d'emissions de television - Google Patents

Systemes de distribution d'emissions de television

Info

Publication number
EP0672326A1
EP0672326A1 EP94927757A EP94927757A EP0672326A1 EP 0672326 A1 EP0672326 A1 EP 0672326A1 EP 94927757 A EP94927757 A EP 94927757A EP 94927757 A EP94927757 A EP 94927757A EP 0672326 A1 EP0672326 A1 EP 0672326A1
Authority
EP
European Patent Office
Prior art keywords
outstation
distribution system
tuner
signals
cabling
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP94927757A
Other languages
German (de)
English (en)
Inventor
Anthony John Mullett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amulet Electronics Ltd
Original Assignee
Amulet Electronics Ltd
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
Priority claimed from GB939320367A external-priority patent/GB9320367D0/en
Application filed by Amulet Electronics Ltd filed Critical Amulet Electronics Ltd
Publication of EP0672326A1 publication Critical patent/EP0672326A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
    • H04N21/4143—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance embedded in a Personal Computer [PC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/025—Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/106—Adaptations for transmission by electrical cable for domestic distribution

Definitions

  • This invention relates to systems for distributing general-broadcast television and/or teletext signals to one or more remote viewing locations (referred to below as outstations) .
  • PCs to allow broadcast television programmes to be viewed on the computer monitor, usually via Windows
  • Such cards accept a broadband aerial feed at the broadcast frequencies, which may carry up to 1,000 or more different TV transmissions.
  • These can be selected by the user using, in most cases, a tuning application window which is generated in Windows and displayed on the monitor screen.
  • the application window may depict a keypad of which various keys can be selected using a keyboard or a displayed pointer (cursor) controlled by a mouse. Clicking the mouse with the pointer on selected keys causes the chosen station to appear on the screen.
  • Some of the existing tuner cards have a baseband output which allows a composite TV signal (e.g. PAL, SECAM or NTSC) to be sent via suitable cabling, e.g. 75 ohm TV coax, to a remote outstation employing a computer and monitor.
  • a composite TV signal e.g. PAL, SECAM or NTSC
  • suitable cabling e.g. 75 ohm TV coax
  • An audio output may also be provided so that accompanying mono or stereo sound can also be sent to the outstation.
  • An aim of the present invention may be viewed as being to provide the facility of channel switching at the outstation whilst allowing the use of inexpensive data grade distribution cabling and without the disadvantages of digitising the video signals.
  • the present invention proposes a television broadcast distribution system comprising:
  • a base station comprising a tuner for receiving broadcast television signals from a wide-band input and having a tuning control input for controlling said tuner to select said broadcast signals, the tuner being arranged to provide a signal output which is derived from said selected broadcast signal;
  • an outstation including:
  • the manual input control means may comprise a keyboard, mouse or trackball.
  • Figure 1 is a schematic diagram of a simple form of television broadcast distribution system of the invention
  • Figure 2 is a schematic diagram of a second form of television broadcast distribution system of the invention for use by a single remote user
  • Figure 3 is a further schematic diagram of a multiple-user form of the system of Fig. 2.
  • a host PC personal computer
  • a tuner card 2 which receives broadband input of a number of satellite and/or terrestrial broadcast television signals via an appropriate antenna system 3.
  • the PC controls the card 2 via a local bus 4 to tune in and process a selected television signal which is sent via bus 5 to be displayed by the PC.
  • a control application image generated by the card 8 or in the PC in Windows is displayed by the PC.
  • the displayed image may typically represents a simple numeric keypad.
  • the card 2 has outputs for low frequency, broadband composite video 6, demodulated audio signals 7 which accompany the broadcast television signals, and the control application image signal 8.
  • a simple image signal generated by the card 2 could be sent down the composite video feed 6, but is shown as a separate feed for purposes of illustration.
  • a separate feed 8 is, however, preferable when the application image is generated in Windows for example, since a more complex signal is generated.
  • the outputs 6-8 are fed via a suitable matching network 9 and twisted pair or other data grade cabling 10, which may be up to 250 metres or more in length.
  • a further matching network 11 at a remote outstation the three signals are fed to a simple video capture card 12 installed in a terminal PC 13.
  • the PC 13 again operates under Windows, through which the received composite video signals are displayed.
  • the received application image signal 8 is overlaid on the main picture displayed on the PC monitor screen, but can be displayed or removed (i.e. reduced to an icon) using a mouse 15 which is used to control operation of the terminal PC in the usual way.
  • a second mouse 16 at the remote terminal can be used to send control signals along a control line 18 in cabling 10 to move a displayed pointer 17 which is generated in the host PC 1 or tuner card 2 and displayed as part of the control application image.
  • the pointer 17 can be used to select channel numbers on the application image which in turn signals the tuner card to receive the selected stations.
  • the received sound can be fed to a conventional sound card installed in the outstation PC.
  • a single terminal mouse 15 could be used to control the application image 14 using a suitable switching arrangement.
  • a switching arrangement may be a simple manual switch to transfer mouse control from the terminal PC to the host PC and back, or an electronic switch which is controlled either from the host or terminal mouse by a predetermined combination of mouse clicks.
  • Decoded teletext data could also be sent from the tuner card 2 along, the cabling 10 to be displayed at the remote outstation. The preferred manner in which this is achieved is described more fully below with reference to Fig. 2.
  • the teletext page which is sent can again be controlled by the mouse 16 via control line 18.
  • a base station 31 includes a teletext decoder and tuner 32 which receives broadband input of satellite and/or terrestrial television signals via an antenna system 33.
  • the tuner 32 is controlled by a microcontroller 34 to tune in a selected television signal which is demodulated and sent to an interface 35 to produce outputs for low frequency composite video 36 and demodulated audio 37.
  • Decoded raw teletext data is also taken from the decoder 32 via a separate output 39.
  • the outputs 36, 37 and 39 are fed via a suitable matching network 38 along twisted pair or other data grade cabling 40, which may be up to 250 metres or more in length.
  • the signals pass via a further matching network 39 to a capture card for sound and video which is installed in a terminal PC 41.
  • the PC 41 operates under Windows or other graphical user interface software, through which the received video and teletext signals are displayed in separate television and teletext windows on the PC monitor 42.
  • the PC includes a mouse 45 which can be used to move a pointer 47 on the PC screen.
  • the teletext data is extracted and sent along line 39 to the remote PC 41 separately from the audio and composite video signals.
  • the data enters the PC through a serial port for processing by the PCs software.
  • An error- checking protocol is used to detect any errors in blocks of received data (conveniently at the end of each line of data) re-transmission of the block is requested if required.
  • an error-free text page is received the page can be stored in PC memory so that it can be called up instantly and displayed when required.
  • changed text pages are broadcast only the changed data blocks are transmitted and re-written into memory at the receiving PC.
  • Each complete received page is interpreted as visual graphics by the PC software, for display on the PC screen. By this means, high resolution error-free text pages can be displayed separately from the television images, and can be called up instantly when required.
  • the PCs operating software allows a tuning application image 44 to be brought up on the monitor screen.
  • the application image, television and teletext windows can be displayed or reduced to icons by pointing and clicking the mouse 45.
  • the mouse and pointer can also be used to select channel numbers in the control application image, which in turn produces digital control signals at a serial port 48.
  • the signals are then fed via the cabling 40 and matching networks 38, 39 to the base station 31.
  • the control signals pass via an input 49 to the microcontroller 34, which in turn controls the tuner 32 to tune in and receive the selected station.
  • the mouse and pointer can be used to click on a teletext control application causing signals to be sent to the microcontroller 34 via cabling 40 to select teletext pages sent to the outstation PC.
  • the received sound is used to drive a sound card in the PC 41.
  • Fig. 3 shows a further development of the system of Fig. 2, in which a single aerial system 3 is fed via a splitter 20 to a number of tuner cards 43. Respective video, teletext and audio outputs from each card are fed via matching networks 29 to a patching frame 21 which sends the signals via twisted pair data grade cabling 40 to separate remote terminal PCs 41 which again control the tuning of the respective tuner cards 43 via the cabling 40 as described.
  • Fig. 3 also shows that one or more of the outputs from the tuner cards 43 could be fed to a video splitter 22 at the remote end of the cabling to feed a number of PCs or dumb monitors 24. These monitors will thus all display the same received signal which is, again, remote-tuned via the cabling 40.
  • the video, audio, teletext and digital control signals from the mouse could be sent along separate or common feed lines depending on the frequency band of the signals.
  • the feed lines could travel in the same or different cabling runs.
  • a pre-existing local area network cabling infrastructure e.g. Ethernet or Token Ring
  • Ethernet or Token Ring could conveniently be used.
  • a trackball or keyboard could be used instead of a mouse, in known manner.
  • a Windows environment is convenient to use the display and control could be implemented in DOS based software if desired.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Television Systems (AREA)

Abstract

Une station de base comprend un syntoniseur ainsi qu'un décodeur (32) de télétextes qui émet des données composites vidéo, audio et de texte brute en (36, 37 et 39), en passant par une infrastructure de câbles (40). Un ordinateur personnel (41) situé à distance est muni d'une carte de saisie afin de recevoir et d'afficher l'image vidéo et d'assembler les données du texte dans une image qui est stockée et affichée à la demande. Cet ordinateur personnel affiche également une fenêtre de fonction de commandes qui, lorsqu'on déplace le curseur avec une souris (45) sur cette fenêtre et clique sur la souris, permet l'envoi de signaux de commande au syntoniseur (32) afin de choisir les chaînes de télévision ainsi que les pages du télétexte via un microrégisseur (34). L'information sous forme de texte est soumise dans l'ordinateur personnel à un protocole de vérification d'erreurs et de retransmission.
EP94927757A 1993-10-02 1994-09-30 Systemes de distribution d'emissions de television Withdrawn EP0672326A1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
GB939320367A GB9320367D0 (en) 1993-10-02 1993-10-02 Television broadcast distribution systems
GB9320367 1993-10-02
GB9325066 1993-12-07
GB939325066A GB9325066D0 (en) 1993-10-02 1993-12-07 Television broadcast distribution systems
GB9404873 1994-03-14
GB9404873A GB9404873D0 (en) 1993-10-02 1994-03-14 Television broadcast distribution systems
PCT/GB1994/002133 WO1995010156A1 (fr) 1993-10-02 1994-09-30 Systemes de distribution d'emissions de television

Publications (1)

Publication Number Publication Date
EP0672326A1 true EP0672326A1 (fr) 1995-09-20

Family

ID=27266875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94927757A Withdrawn EP0672326A1 (fr) 1993-10-02 1994-09-30 Systemes de distribution d'emissions de television

Country Status (3)

Country Link
EP (1) EP0672326A1 (fr)
GB (2) GB9404873D0 (fr)
WO (1) WO1995010156A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2316563A (en) * 1996-08-13 1998-02-25 Apricot Computers Ltd Computer able to Receive Broadcasts or Transmissions
BR9713597A (pt) * 1996-12-19 2000-04-04 Index Systems Inc Epg com suplementos de anúncio
US5982363A (en) * 1997-10-24 1999-11-09 General Instrument Corporation Personal computer-based set-top converter for television services
US20030106072A1 (en) * 2001-12-05 2003-06-05 Koninklijke Philips Electronics N.V. Multimedia storage and control system
KR100621177B1 (ko) 2004-08-03 2006-09-19 삼성전자주식회사 멀티미디어시스템

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3177228D1 (de) * 1980-03-31 1990-12-06 Gen Instrument Corp Fernseh uebertragungsanordnung zum uebertragen von datensignalen.
GB2117210A (en) * 1982-01-26 1983-10-05 Kenneth James Fenning Video transmission system
GB8328601D0 (en) * 1983-10-26 1983-11-30 Givertz M J Data retrieval system
NL8400860A (nl) * 1984-03-16 1985-10-16 Nl Standard Electric Mij B V Kabeltelevisienetwerk.
DE3823219C1 (fr) * 1988-07-08 1989-05-18 Telenorma Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt, De
FR2649846A1 (fr) * 1989-07-17 1991-01-18 Monier Ste Civile Reseau de distribution par commutation de signaux video avec modules individuels d'amplification, de selection et de reception de la telecommande
GB8922702D0 (en) * 1989-10-09 1989-11-22 Videologic Ltd Radio television receiver
US5119319A (en) * 1989-12-14 1992-06-02 Options Unlimited Research Corp. Full-duplex video communication system
FR2656188B1 (fr) * 1989-12-18 1996-10-18 Telediffusion Fse Installation a reseau filaire de distribution de programmes et de communication numerique et terminal pour une telle installation.
US5193208A (en) * 1990-05-14 1993-03-09 Sony Corporation Signal transmission system
US5249164A (en) * 1990-06-27 1993-09-28 Koz Mark C Digital color tv for personal computers
EP0491068A1 (fr) * 1990-12-18 1992-06-24 International Business Machines Corporation Adaptateur récepteur de diffusion de données sélectives pour des ordinateurs personnels
GB9121203D0 (en) * 1991-10-04 1991-11-20 D2B Systems Co Ltd Local communication bus system and apparatus for use in such a system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9510156A1 *

Also Published As

Publication number Publication date
WO1995010156A1 (fr) 1995-04-13
GB2283399B (en) 1996-01-03
GB9419867D0 (en) 1994-11-16
GB9404873D0 (en) 1994-04-27
GB2283399A (en) 1995-05-03

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