GB1369463A - Communications systems - Google Patents

Communications systems

Info

Publication number
GB1369463A
GB1369463A GB5439771A GB5439771A GB1369463A GB 1369463 A GB1369463 A GB 1369463A GB 5439771 A GB5439771 A GB 5439771A GB 5439771 A GB5439771 A GB 5439771A GB 1369463 A GB1369463 A GB 1369463A
Authority
GB
United Kingdom
Prior art keywords
data
line
sync
video
stations
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.)
Expired
Application number
GB5439771A
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.)
PROCESS PERIPHERALS Ltd
Original Assignee
PROCESS PERIPHERALS 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 PROCESS PERIPHERALS Ltd filed Critical PROCESS PERIPHERALS Ltd
Priority to GB5439771A priority Critical patent/GB1369463A/en
Publication of GB1369463A publication Critical patent/GB1369463A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0489—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using dedicated keyboard keys or combinations thereof
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/153—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using cathode-ray tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
    • H04N7/0888—Subscription systems therefor
    • 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
    • H04N7/17345—Control of the passage of the selected programme
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Television Systems (AREA)

Abstract

1369463 Video distribution systems PROCESS PERIPHERALS Ltd 8 Jan 1973 [23 Nov 1971] 54397/71 Heading H4R In a communication system in which a central station is connected by individual cable conductors to outer stations so as to transmit video information with line and frame sync intervals to raster-type displays, the outer stations respond to the incoming information to transmit data to the central station over the same distribution conductor during the frame or line sync interval. At each outer station the video sync signals are separated at 15 and fed to timing generator 16, control logic 24 and remixed at 30 with the separated video before passing to the display monitor. The timing generator 16 detects the first broad pulse of the sync signals, counts nine pulses from the second, then produces an output trigger pulse at the start of each of the following nine line periods corresponding to the flyback period over which data is to be transmitted back to the central station. A blanking signal is generated during this whole period and mixed with the video at 19 to prevent the data appearing at the monitor. The data is entered via keyboard 20 (or tape reader), stored 22, then transferred by byte to store 23 which is controlled by timing pulse generator 16 and keyboard strobe signal to gate the data to driver 25 and thence back along the line. The data is in the form of 1 start, 1 parity and seven bits as positive pulses of 45 �sec. duration superposed on the 64 �sec negative line sync pulses. The stations may include a facility to display the output of store 22. At the central station (Fig. 4, not shown) data from any of 64 outer stations is stored 41, interrogated to see if the first data line is new and read-out accordingly to a unit (44) having direct memory access to computer. Address signals from unit (45) identify the station involved, and the whole operation is controlled (43) by a logic unit (43) according to line sync (46). In a modification (Figs. 5a, 5b, not shown) the sync pulse (14) in the sync interval (13) is short (500 n sec.) but is extended at the outer stations for display and is used to gate the data down the line as above.
GB5439771A 1971-11-23 1971-11-23 Communications systems Expired GB1369463A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5439771A GB1369463A (en) 1971-11-23 1971-11-23 Communications systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5439771A GB1369463A (en) 1971-11-23 1971-11-23 Communications systems

Publications (1)

Publication Number Publication Date
GB1369463A true GB1369463A (en) 1974-10-09

Family

ID=10470878

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5439771A Expired GB1369463A (en) 1971-11-23 1971-11-23 Communications systems

Country Status (1)

Country Link
GB (1) GB1369463A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0039102A1 (en) * 1980-04-25 1981-11-04 Koninklijke Philips Electronics N.V. Bidirectional information transmission via a long distance video interface (LDVI) cable
EP0043167B1 (en) * 1980-07-01 1985-01-02 ATELIERS DE CONSTRUCTIONS ELECTRIQUES DE CHARLEROI (ACEC) Société Anonyme Method of transmitting information via television networks
WO1985002742A1 (en) * 1983-12-09 1985-06-20 Zenith Electronics Corporation Upstream data packet time slot synchronization with downstream vbi for two-way catv system
EP0174099A2 (en) * 1984-08-06 1986-03-12 Texas Instruments Incorporated Fiber optic terminal interface

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0039102A1 (en) * 1980-04-25 1981-11-04 Koninklijke Philips Electronics N.V. Bidirectional information transmission via a long distance video interface (LDVI) cable
US4390900A (en) 1980-04-25 1983-06-28 U.S. Philips Corporation Bidirectional information transmission via a long distance video interface (LDVI) cable
EP0043167B1 (en) * 1980-07-01 1985-01-02 ATELIERS DE CONSTRUCTIONS ELECTRIQUES DE CHARLEROI (ACEC) Société Anonyme Method of transmitting information via television networks
WO1985002742A1 (en) * 1983-12-09 1985-06-20 Zenith Electronics Corporation Upstream data packet time slot synchronization with downstream vbi for two-way catv system
EP0174099A2 (en) * 1984-08-06 1986-03-12 Texas Instruments Incorporated Fiber optic terminal interface
EP0174099A3 (en) * 1984-08-06 1990-03-07 Texas Instruments Incorporated Fiber optic terminal interface

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees