FR2271727A1 - Cable television distribution system - has separate return channel from subscriber on telephone line to reduce noise - Google Patents

Cable television distribution system - has separate return channel from subscriber on telephone line to reduce noise

Info

Publication number
FR2271727A1
FR2271727A1 FR7403981A FR7403981A FR2271727A1 FR 2271727 A1 FR2271727 A1 FR 2271727A1 FR 7403981 A FR7403981 A FR 7403981A FR 7403981 A FR7403981 A FR 7403981A FR 2271727 A1 FR2271727 A1 FR 2271727A1
Authority
FR
France
Prior art keywords
subscriber
distribution system
cable television
television distribution
telephone line
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.)
Granted
Application number
FR7403981A
Other languages
French (fr)
Other versions
FR2271727B1 (en
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.)
RADIO DIFFUSION TV FRANCAISE
Original Assignee
RADIO DIFFUSION TV FRANCAISE
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 RADIO DIFFUSION TV FRANCAISE filed Critical RADIO DIFFUSION TV FRANCAISE
Priority to FR7403981A priority Critical patent/FR2271727A1/en
Publication of FR2271727A1 publication Critical patent/FR2271727A1/en
Application granted granted Critical
Publication of FR2271727B1 publication Critical patent/FR2271727B1/fr
Granted legal-status Critical Current

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
    • H04N7/17309—Transmission or handling of upstream communications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • 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
    • H04N2007/17372—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal the upstream transmission being initiated or timed by a signal from upstream of the user terminal
    • 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
    • H04N2007/1739—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal the upstream communication being transmitted via a separate link, e.g. telephone line

Abstract

The cable television distribution system comprises principle cables, from a distribution centre to which connections are made. Transmission is by frequency multiplex and return information from the subscriber is via a separate return cable which permits a reduction in noise level. The distribution centre comprises transmission units including round and vision modulation units whose output frequencies are frequency transposed into bands. A multiplexer outputs these transmitted programmes onto principle cables through amplifiers. A digital information carrier is also provided by an interrogator. Return channels (54, 154, 254) pass through amplifiers (160-162) to memory circuits (163-165) into a calculator which classifies the information. A terminal connected to the calculator determines the programme choice depending on outputs from the interrogator.
FR7403981A 1974-02-06 1974-02-06 Cable television distribution system - has separate return channel from subscriber on telephone line to reduce noise Granted FR2271727A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7403981A FR2271727A1 (en) 1974-02-06 1974-02-06 Cable television distribution system - has separate return channel from subscriber on telephone line to reduce noise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7403981A FR2271727A1 (en) 1974-02-06 1974-02-06 Cable television distribution system - has separate return channel from subscriber on telephone line to reduce noise

Publications (2)

Publication Number Publication Date
FR2271727A1 true FR2271727A1 (en) 1975-12-12
FR2271727B1 FR2271727B1 (en) 1979-05-25

Family

ID=9134562

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7403981A Granted FR2271727A1 (en) 1974-02-06 1974-02-06 Cable television distribution system - has separate return channel from subscriber on telephone line to reduce noise

Country Status (1)

Country Link
FR (1) FR2271727A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2415404A1 (en) * 1978-01-23 1979-08-17 Communications Patents Ltd IMPROVEMENTS RELATED TO OR RELATED TO CABLE BROADCASTING DEVICES
EP0094794A2 (en) * 1982-05-14 1983-11-23 Communications Patents Limited Communications system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2415404A1 (en) * 1978-01-23 1979-08-17 Communications Patents Ltd IMPROVEMENTS RELATED TO OR RELATED TO CABLE BROADCASTING DEVICES
EP0094794A2 (en) * 1982-05-14 1983-11-23 Communications Patents Limited Communications system
EP0094794A3 (en) * 1982-05-14 1987-05-20 Communications Patents Limited Communications system

Also Published As

Publication number Publication date
FR2271727B1 (en) 1979-05-25

Similar Documents

Publication Publication Date Title
IL64100A0 (en) Analogue/digital telecommunications subscriber station
ES8105910A1 (en) Service integrated information transmission and switching system for sound, picture and data.
ES8201378A1 (en) Digital message transmission system.
GB1406754A (en) Cable television system
GB1304606A (en)
GB1521340A (en) Digital data communication network
JPS6411430A (en) Radio communication system
FR2412994A1 (en) Multiplexing system in two-wire telephone subscriber network - allows independent subscribers to send data and voice signals via same two-wire telephone line
DE3067181D1 (en) Telecommunication system
JPS57107664A (en) Electronic button telephone set
ES8304737A1 (en) Digital two-to-four wire converter for full duplex signals
FR2271727A1 (en) Cable television distribution system - has separate return channel from subscriber on telephone line to reduce noise
US3435148A (en) Time division multiplex pulse code modulation communication system by pulse distribution transmission
SE7502806L (en)
ES395670A1 (en) Time-sharing subscriber communications system
US3022504A (en) Two-way radio telephone system utilizing frequency subbands to provide transmitter-receiver isolation
US2421333A (en) Multiplex carrier current communication system with transmission line impedance control means
GB1393777A (en) Telecommunications exchange systems
GB1043297A (en) A multiplex voice frequency band compression system
US3023276A (en) Communication system
US3835244A (en) Wired broadcasting systems
JPS57206145A (en) End office device for transport of cable telephone
GB1372905A (en) Apparatus for tesring data modems which simultaneously transmit and receive freuquency multiplexed signals
US2585058A (en) Telephone radio link termination
GB1023662A (en) Improvements in or relating to two-wire carrier multichannel communication systems

Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse