FR2271727B1 - - Google Patents

Info

Publication number
FR2271727B1
FR2271727B1 FR7403981A FR7403981A FR2271727B1 FR 2271727 B1 FR2271727 B1 FR 2271727B1 FR 7403981 A FR7403981 A FR 7403981A FR 7403981 A FR7403981 A FR 7403981A FR 2271727 B1 FR2271727 B1 FR 2271727B1
Authority
FR
France
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.)
Expired
Application number
FR7403981A
Other languages
French (fr)
Other versions
FR2271727A1 (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.)
Telediffusion de France ets Public de Diffusion
Original Assignee
Telediffusion de France ets Public de Diffusion
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 Telediffusion de France ets Public de Diffusion filed Critical Telediffusion de France ets Public de Diffusion
Priority to FR7403981A priority Critical patent/FR2271727A1/fr
Publication of FR2271727A1 publication Critical patent/FR2271727A1/fr
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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
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 FR2271727A1 (en) 1975-12-12
FR2271727B1 true FR2271727B1 (https=) 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 (https=)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1586543A (en) * 1978-01-23 1981-03-18 Communications Patents Ltd Wired broadcasting systems
GB2121656B (en) * 1982-05-14 1986-08-20 Communications Patents Ltd Communications system

Also Published As

Publication number Publication date
FR2271727A1 (en) 1975-12-12

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Legal Events

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