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 noiseInfo
- 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
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)
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.
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)
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 |
-
1974
- 1974-02-06 FR FR7403981A patent/FR2271727A1/en active Granted
Cited By (3)
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 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property | ||
ST | Notification of lapse |