BE1003363A5 - Reseau de television cable bidirectionnel. - Google Patents

Reseau de television cable bidirectionnel. Download PDF

Info

Publication number
BE1003363A5
BE1003363A5 BE8900433A BE8900433A BE1003363A5 BE 1003363 A5 BE1003363 A5 BE 1003363A5 BE 8900433 A BE8900433 A BE 8900433A BE 8900433 A BE8900433 A BE 8900433A BE 1003363 A5 BE1003363 A5 BE 1003363A5
Authority
BE
Belgium
Prior art keywords
upstream
cable television
television network
way cable
order
Prior art date
Application number
BE8900433A
Other languages
English (en)
Inventor
Michel Dufresne
Samir Sammoun
Alain Tessier
Francois Methot
Original Assignee
Videotron 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
Application filed by Videotron Ltd filed Critical Videotron Ltd
Application granted granted Critical
Publication of BE1003363A5 publication Critical patent/BE1003363A5/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

Dans le réseau de télévision câble bidirectionnel, on utilise, dans les lignes de distribution (3) et/ou le tronc (2), des filtres (9) amont à bandes étroites comprenant chacun une porte afin de réduire sensiblement les bruits collectés transmis vers l'amont. Dans chaque filtre amont (9), on prévoit un détecteur qui détecte l'énergie du signal amont et ouvre la porte du filtre (9) quand cette énergie dépasse un seuil prédéterminé. On prévoit également que les portes peuvent être sélectivement ouvertes sur ordre de la tête de réseau (1).
BE8900433A 1988-04-21 1989-04-20 Reseau de television cable bidirectionnel. BE1003363A5 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA000564762A CA1327238C (fr) 1988-04-21 1988-04-21 Reseau stac filtre

Publications (1)

Publication Number Publication Date
BE1003363A5 true BE1003363A5 (fr) 1992-03-10

Family

ID=4137884

Family Applications (1)

Application Number Title Priority Date Filing Date
BE8900433A BE1003363A5 (fr) 1988-04-21 1989-04-20 Reseau de television cable bidirectionnel.

Country Status (7)

Country Link
US (1) US4982440A (fr)
JP (1) JPH0221789A (fr)
BE (1) BE1003363A5 (fr)
CA (1) CA1327238C (fr)
DE (1) DE3913207C2 (fr)
FR (1) FR2630609B1 (fr)
GB (3) GB2218308B (fr)

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US3886454A (en) * 1973-08-13 1975-05-27 Rca Corp Control apparatus for a two-way cable television system
US3924187A (en) * 1974-05-14 1975-12-02 Magnavox Co Two-way cable television system with enhanced signal-to-noise ratio for upstream signals

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Also Published As

Publication number Publication date
CA1327238C (fr) 1994-02-22
US4982440A (en) 1991-01-01
GB9218083D0 (en) 1992-10-14
GB2256998A (en) 1992-12-23
GB2255698B (en) 1993-02-10
GB2218308B (en) 1993-02-10
GB8908183D0 (en) 1989-05-24
GB2218308A (en) 1989-11-08
GB2256998B (en) 1993-05-05
GB2255698A (en) 1992-11-11
GB9214583D0 (en) 1992-08-19
FR2630609A1 (fr) 1989-10-27
DE3913207A1 (de) 1989-11-16
JPH0221789A (ja) 1990-01-24
DE3913207C2 (de) 1996-07-04
FR2630609B1 (fr) 1996-06-28

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Legal Events

Date Code Title Description
RE Patent lapsed

Owner name: VIDEOTRON LTEE

Effective date: 19990430