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GB2222057A - Electro-magnetic broadcast access control method - Google Patents

Electro-magnetic broadcast access control method Download PDF

Info

Publication number
GB2222057A
GB2222057A GB8809244A GB8809244A GB2222057A GB 2222057 A GB2222057 A GB 2222057A GB 8809244 A GB8809244 A GB 8809244A GB 8809244 A GB8809244 A GB 8809244A GB 2222057 A GB2222057 A GB 2222057A
Authority
GB
United Kingdom
Prior art keywords
information
electro
control method
magnetic
landline
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
GB8809244A
Other versions
GB8809244D0 (en
GB2222057B (en
Inventor
Clive Vernon Smedley
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.)
CARRIDICE Ltd
Original Assignee
CARRIDICE 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 CARRIDICE Ltd filed Critical CARRIDICE Ltd
Priority to GB8809244A priority Critical patent/GB2222057B/en
Publication of GB8809244D0 publication Critical patent/GB8809244D0/en
Publication of GB2222057A publication Critical patent/GB2222057A/en
Application granted granted Critical
Publication of GB2222057B publication Critical patent/GB2222057B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/20—Countermeasures against jamming
    • H04K3/22—Countermeasures against jamming including jamming detection and monitoring
    • H04K3/224—Countermeasures against jamming including jamming detection and monitoring with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer
    • H04K3/228—Elimination in the received signal of jamming or of data corrupted by jamming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/10—Secret communication by using two signals transmitted simultaneously or successively

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

In an electro-magnetic broadcast access control method the information is split into separate parts and transmitted separately using electro-magnetic transmission and landline and re-assembled to reproduce the input information. Access is controlled by switching and metering of the landline part of the information. The electro-magnetically broadcast information may contain a jamming signal and a combination of the broadcast and landline signals is required to make the received signal intelligible. <IMAGE>

Description

ELECTRO-MAGNETIC BROADCAST ACCESS CONTROL METHOD This invention relates to an electro-magnetic broadcast access control method.
Electro-magnetic broadcasts are widely used to transmit information without the use of a physical connection between the transmitter and receiver.
Electro-magnetically broadcast information may be received without the knowledge or permission of the broadcaster.
According to the present invention there is provided an electromagnetic transmitter which broadcasts only part of the information. The other part of the information is transmitted over a landline. Only when both the electro-magnetically broadcast information and the landline information are present will the information be complete. Control of access to the landline by switches and metering therefore provides control over access to the complete information. Alternatively or also the electro-magnetically broadcast information may contain a jamming signal which renders the information un-intelligible unless combined with, modified by, replaced, reduced, removed and/or cancelled by a signal carried by landline.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing in which : Figure 1 shows a block diagram of the electro-magnetic broadcast access control method.
Referring to the block diagram the method comprises 1 Input information. 2 A splitter which separates the elements to be transmitted electro-magnetically part A and by landline part B. 3 An electro-magnetic transmitter. 4 A landline transmitter. 5 A Landline with switching and metering facilities. 6 A signal processor which assembles the electro-magnetically transmitted information and the landline information into a form which carries the complete information. 7 A receiver which converts the information into a useful form. 8 Output information which is a reproduction of the input information.

Claims (6)

1 An electro-magnetic broadcast access and control method comprising a system which splits information into two parts and transmits each part independently via electro-magnetic transmission and landline transmission. The separate transmissions are then re-assembled and used to reproduce the original information. Access control is provided by switching and metering of the landline carried part of the information.
2 An electro-magnetic broadcast access and control method as claimed in claim 1 above wherein the splitting of the information renders it un-intelligible until re-assembled.
3 An electro-magnetic broadcast access and control method as claimed in claim 1 and claim 2 above wherein multiple electromagnetic and landline transmissions are used to split and re-assemble the information.
4 An electro-magnetic broadcast access and control method as claimed in claims 1, 2 and 3 above wherein part or parts of the information are synthetized in order to reproduce the input information.
5 An electro-magnetic broadcast access and control method as claimed in claims 1,2,3 and 4 above wherein part of the information is transmitted in the form of data which is used to produce a signal which has the effect of rendering the other part or parts of the transmission complete.
6 An electro-magnetic broadcast access and control method as claimed in claims 1,2,3,4 and 5 above wherein the information reproduced is used to operate, activate, input to or effect a system or device.
GB8809244A 1988-04-19 1988-04-19 Electro-magnetic broadcast access control method Expired - Fee Related GB2222057B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8809244A GB2222057B (en) 1988-04-19 1988-04-19 Electro-magnetic broadcast access control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8809244A GB2222057B (en) 1988-04-19 1988-04-19 Electro-magnetic broadcast access control method

Publications (3)

Publication Number Publication Date
GB8809244D0 GB8809244D0 (en) 1988-05-25
GB2222057A true GB2222057A (en) 1990-02-21
GB2222057B GB2222057B (en) 1992-09-23

Family

ID=10635459

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8809244A Expired - Fee Related GB2222057B (en) 1988-04-19 1988-04-19 Electro-magnetic broadcast access control method

Country Status (1)

Country Link
GB (1) GB2222057B (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999034547A1 (en) * 1997-12-24 1999-07-08 Interactive Magazines Ltd. Secret communication method between three participants
EP0833285A3 (en) * 1996-09-27 2000-03-01 Xerox Corporation Method and product for generating electronic tokens
EP0993142A1 (en) * 1998-09-14 2000-04-12 Lucent Technologies Inc. Safe transmission of broadband data messages
WO2000049597A1 (en) * 1999-02-16 2000-08-24 Tuneto.Com, Inc. Audio synthesis using digital sampling of coded waveforms
US6633982B1 (en) * 1999-03-20 2003-10-14 Wayne Samuel Kurzeja Method and process for managing ultra secure electronic distribution of digital movies to commercial exhibitors
WO2003085871A1 (en) * 2002-04-04 2003-10-16 Telefonaktiebolaget Lm Ericsson (Publ) Arrangements and methods for secure data transmission
US6857106B1 (en) 1999-09-15 2005-02-15 Listen.Com, Inc. Graphical user interface with moveable, mergeable elements
US7099848B1 (en) 1999-02-16 2006-08-29 Listen.Com, Inc. Audio delivery and rendering method and apparatus
EP1696417A3 (en) * 1999-02-16 2007-01-17 Listen.Com, Inc. Audio synthesis using digital sampling of coded waveforms
US7565675B2 (en) 1999-12-08 2009-07-21 Listen.Com, Inc. Scheduled retrieval, storage and access of media data
DE102012216392A1 (en) * 2011-09-29 2013-04-04 Continental Teves Ag & Co. Ohg Method and system for the distributed transmission of a communication flow and use of the system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392241A (en) * 1981-04-30 1983-07-05 The United States Of America As Represented By The Secretary Of The Navy Digital interface system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392241A (en) * 1981-04-30 1983-07-05 The United States Of America As Represented By The Secretary Of The Navy Digital interface system

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0833285A3 (en) * 1996-09-27 2000-03-01 Xerox Corporation Method and product for generating electronic tokens
WO1999034547A1 (en) * 1997-12-24 1999-07-08 Interactive Magazines Ltd. Secret communication method between three participants
KR100593577B1 (en) * 1998-09-14 2006-06-28 루센트 테크놀러지스 인크 Secure transmission of broadband data messages
EP0993142A1 (en) * 1998-09-14 2000-04-12 Lucent Technologies Inc. Safe transmission of broadband data messages
US6377690B1 (en) 1998-09-14 2002-04-23 Lucent Technologies Inc. Safe transmission of broadband data messages
US7099848B1 (en) 1999-02-16 2006-08-29 Listen.Com, Inc. Audio delivery and rendering method and apparatus
WO2000049597A1 (en) * 1999-02-16 2000-08-24 Tuneto.Com, Inc. Audio synthesis using digital sampling of coded waveforms
EP1696417A3 (en) * 1999-02-16 2007-01-17 Listen.Com, Inc. Audio synthesis using digital sampling of coded waveforms
US6633982B1 (en) * 1999-03-20 2003-10-14 Wayne Samuel Kurzeja Method and process for managing ultra secure electronic distribution of digital movies to commercial exhibitors
US6857106B1 (en) 1999-09-15 2005-02-15 Listen.Com, Inc. Graphical user interface with moveable, mergeable elements
US7565675B2 (en) 1999-12-08 2009-07-21 Listen.Com, Inc. Scheduled retrieval, storage and access of media data
WO2003085871A1 (en) * 2002-04-04 2003-10-16 Telefonaktiebolaget Lm Ericsson (Publ) Arrangements and methods for secure data transmission
DE102012216392A1 (en) * 2011-09-29 2013-04-04 Continental Teves Ag & Co. Ohg Method and system for the distributed transmission of a communication flow and use of the system
US10015195B2 (en) 2011-09-29 2018-07-03 Continental Teves Ag & Co. Oh Method and system for the distributed transmission of a communication flow and use of the system

Also Published As

Publication number Publication date
GB8809244D0 (en) 1988-05-25
GB2222057B (en) 1992-09-23

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940419