IL40808A - Wired broadcasting systems - Google Patents
Wired broadcasting systemsInfo
- Publication number
- IL40808A IL40808A IL40808A IL4080872A IL40808A IL 40808 A IL40808 A IL 40808A IL 40808 A IL40808 A IL 40808A IL 4080872 A IL4080872 A IL 4080872A IL 40808 A IL40808 A IL 40808A
- Authority
- IL
- Israel
- Prior art keywords
- signals
- subscriber
- data
- broadcasting system
- wired broadcasting
- Prior art date
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
- 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
1412586 Wired broadcasting systems COMMUNICATIONS PATENTS Ltd 7 Nov 1972 [25 Nov 1971] 54822/71 Heading H4R A broadcasting system of the type disclosed in Specification 1,272,594 has associated therewith a central data processing station 24, e.g. a computer, which communicates with the subscriber stations 8-15 by feeding binary shift data signals into vision circuits at a frequency outside that used for the vision transmission and the signals are transmitted to every sub. scriber station via their respective twisted pair of high frequency conductors. The signals are modified at each subscriber station and are fed, doubled in frequency, via a buffer and the interstitial pair of control wires back to a programme exchange where the signals for groups of 28 subscribers are fed in tdm. manner back to the central data processing station 24, via continuously driven switches 27, 28 and cables 25, 26 connecting each programme exchange with the central data processing station. Each exchange has 12 groups of 28 subscribers and the cables 25, 26 may be 12 pair cables or each group of 28 subscribers may be allotted a carrier frequency on a single cable. A group identification label is added to each returning data message at the programme exchange before multiplexing. The arrangement may be used for billing purposes, for determining which programme a subscriber is watching, for educational purposes, i.e. to enable a subscriber to freeze the picture in a visual teaching system, &c. An overriding alarm facility to warn of damage to the cable in burglary or fire may be provided which operates automatically if a subscriber station fails to respond to a data message. (From GB1412586 A) [FR2161122A1]
Claims (11)
1. A wired broadcasting system in which each of a group of subscribers stations is connected to a programme exchange through a signal path which comprises a twisted pair of conductors suitable for the transmission of high frequency television signals having associated therewith an intersticial pair of conductors suitable for the transmission of audio frequency and control signals for controlling switch means at the programme exchange whereby a subscriber may apply to his high frequency conductor pair any of a number of programmes comprising a central information processing equipment arranged to apply data signals to each programme channel so that each of the subscriber stations receives the same data signals, means associated with each of the subscriber stations for modifying data signals received from said central equipment, and means for returning the individual modified data signals from the subscriber stations to the central processing station.
2. A wired broadcasting system as claimed in claim 1 wherein separate signals paths are provided for returning information or data from each programme exchange to the central data station.
3. A wired broadcasting system as claimed in claim 2, wherein the return signal paths between the programme exchange and central data station are shared between a plurality of subscriber stations each of which is arranged to be connected thereto in sequence.
4. A wired broadcasting system as claimed in any one of the preceding claims which includes means for transmitting the information or data as binary representative frequency shift signals .
5. A wired broadcasting system as claimed in claim 4, wherein the frequency of said signals is arranged to lie outside the frequency band or bands occupied by vision signals on the trunk and subscriber circuits.
6. A wired broadcasting system as claimed in any on© of the preceding claims, wherein the transmission of information or data is effected by the repeated transmission of a train of signals.
7. A wired broadcasting system as claimed in claim 6, wherein said signals are modified by information or data responsive equipment at each subscriber s.tation. n
8. A wired broadcasting system as claimed in claim 7» wherein means are provided at each subscriber station-to store information or data signals received from the central data station until a signal path is available for returning said stored information in modified form to said central data station. i' n
9. A wired broadcasting system as clajimed in claim 4 or any one of claims 5 to 8 when apendant thereto, wherein the frequency shift signals have frequencies of 110 KHz and IkO KHz respectively.
10. A wired broadcasting system as claimed in claim 9» wherein the information or data equipment at the .subscriber station is effective to double the frequency of the data signals · prior to their return to the central data station.
11. A wired broadcasting system substantially as described
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5482271A GB1412586A (en) | 1971-11-25 | 1971-11-25 | Wired broadcasting systems |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IL40808A0 IL40808A0 (en) | 1973-01-30 |
| IL40808A true IL40808A (en) | 1976-08-31 |
Family
ID=10472182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL40808A IL40808A (en) | 1971-11-25 | 1972-11-12 | Wired broadcasting systems |
Country Status (14)
| Country | Link |
|---|---|
| JP (1) | JPS4864802A (en) |
| AU (1) | AU467268B2 (en) |
| BE (1) | BE791941A (en) |
| CH (1) | CH552316A (en) |
| DE (1) | DE2257644C3 (en) |
| ES (1) | ES408940A1 (en) |
| FR (1) | FR2161122B1 (en) |
| GB (1) | GB1412586A (en) |
| IL (1) | IL40808A (en) |
| IT (1) | IT973721B (en) |
| MT (1) | MTP730B (en) |
| NL (1) | NL7215797A (en) |
| SE (1) | SE387027B (en) |
| ZA (1) | ZA728024B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2917978C2 (en) * | 1979-05-04 | 1983-12-22 | Volker Joachim 4400 Münster Remme | Cable communication system |
| ATE16548T1 (en) * | 1982-04-29 | 1985-11-15 | Deltavisie Bv | SYSTEM FOR TRANSMISSION OF PROGRAM OR DATA SIGNALS. |
| DE3382546D1 (en) * | 1982-05-14 | 1992-05-27 | Communications Patents Ltd | COMMUNICATION SYSTEM. |
| GB2164229B (en) * | 1982-05-14 | 1986-08-20 | Communications Patents Ltd | Communications system |
| US4605958A (en) * | 1983-04-14 | 1986-08-12 | Control Data Corporation | Method and apparatus for detecting the channel to which an electronic receiver system is tuned |
| US4789860A (en) * | 1985-03-12 | 1988-12-06 | U.S. Philips Corp. | Interface between a receiver and a sub-system |
| US4896209A (en) * | 1987-02-10 | 1990-01-23 | Sony Corporation | Passenger vehicle polling system having a central unit for polling passenger seat terminal units |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1409479A (en) * | 1963-07-24 | 1965-08-27 | Skiatron Elect & Tele | slave transceivers called transponders retransmitting signals produced by the central station |
-
0
- BE BE791941D patent/BE791941A/en not_active IP Right Cessation
-
1971
- 1971-11-25 GB GB5482271A patent/GB1412586A/en not_active Expired
-
1972
- 1972-11-11 MT MT730A patent/MTP730B/en unknown
- 1972-11-12 IL IL40808A patent/IL40808A/en unknown
- 1972-11-13 ZA ZA728024A patent/ZA728024B/en unknown
- 1972-11-16 SE SE7214883A patent/SE387027B/en unknown
- 1972-11-20 CH CH1687272A patent/CH552316A/en not_active IP Right Cessation
- 1972-11-22 NL NL7215797A patent/NL7215797A/xx not_active Application Discontinuation
- 1972-11-23 AU AU49200/72A patent/AU467268B2/en not_active Expired
- 1972-11-24 ES ES408940A patent/ES408940A1/en not_active Expired
- 1972-11-24 IT IT54267/72A patent/IT973721B/en active
- 1972-11-24 FR FR7242698A patent/FR2161122B1/fr not_active Expired
- 1972-11-24 DE DE2257644A patent/DE2257644C3/en not_active Expired
- 1972-11-25 JP JP47117710A patent/JPS4864802A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB1412586A (en) | 1975-11-05 |
| IT973721B (en) | 1974-06-10 |
| AU467268B2 (en) | 1975-11-27 |
| CH552316A (en) | 1974-07-31 |
| JPS4864802A (en) | 1973-09-07 |
| MTP730B (en) | 1973-08-10 |
| SE387027B (en) | 1976-08-23 |
| DE2257644B2 (en) | 1979-05-17 |
| AU4920072A (en) | 1974-05-23 |
| ES408940A1 (en) | 1975-10-16 |
| IL40808A0 (en) | 1973-01-30 |
| BE791941A (en) | 1973-03-16 |
| NL7215797A (en) | 1973-05-29 |
| FR2161122B1 (en) | 1978-03-03 |
| DE2257644C3 (en) | 1980-01-17 |
| DE2257644A1 (en) | 1973-05-30 |
| FR2161122A1 (en) | 1973-07-06 |
| ZA728024B (en) | 1973-07-25 |
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