SE9301236L - Method and apparatus for coordinated coding and decoding of a TV signal or other message signal - Google Patents

Method and apparatus for coordinated coding and decoding of a TV signal or other message signal

Info

Publication number
SE9301236L
SE9301236L SE9301236A SE9301236A SE9301236L SE 9301236 L SE9301236 L SE 9301236L SE 9301236 A SE9301236 A SE 9301236A SE 9301236 A SE9301236 A SE 9301236A SE 9301236 L SE9301236 L SE 9301236L
Authority
SE
Sweden
Prior art keywords
receiving unit
tref
signal
reference time
unit
Prior art date
Application number
SE9301236A
Other languages
Swedish (sv)
Other versions
SE9301236D0 (en
Inventor
Erik Rickard Soederqvist
Original Assignee
Erik Rickard Soederqvist
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 Erik Rickard Soederqvist filed Critical Erik Rickard Soederqvist
Priority to SE9301236A priority Critical patent/SE9301236L/en
Publication of SE9301236D0 publication Critical patent/SE9301236D0/en
Priority to PCT/SE1994/000338 priority patent/WO1994024825A1/en
Priority to AU65475/94A priority patent/AU6547594A/en
Publication of SE9301236L publication Critical patent/SE9301236L/en
Priority to SE9503590A priority patent/SE514480C2/en

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
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

A message signal (RFA, RFB) is transmitted from a transmitting unit (10) to at least one receiving unit (25) in a state coded by means of an encoder (13). Simultaneouly, a separate control signal (SD), generated by the transmitting unit (10), is transmitted and causes a decoder (28) in the receiving unit (25) to accomplish a coding operation on the received coded message signal (RFA', RFB'), timely coordinated with the coding operation. The control signal (SD) consists of a continous data stream, composed of frames (F) of equal length. Each frame (F) contains a predetermined frame synchronization word (FW) which defines a cyclically recurring reference time (Tref) for the transmitting unit (10) and which is utilized in receiving unit (25) to determine a corresponding cyclically recurring reference time (Tref') for this unit. At least some frames (F) also contain data which define the time (t2A, t2B) for an alteration of the operating mode of the encoder (13), related to said reference time (Tref) for the transmitting unit (10), and which are utilized in the receiving unit (25) to determine a time (t2A', t2B') for a corresponding alteration of the operating mode of the decoder (28), related to said reference time (Tref') for the receiving unit (25).
SE9301236A 1993-04-15 1993-04-15 Method and apparatus for coordinated coding and decoding of a TV signal or other message signal SE9301236L (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE9301236A SE9301236L (en) 1993-04-15 1993-04-15 Method and apparatus for coordinated coding and decoding of a TV signal or other message signal
PCT/SE1994/000338 WO1994024825A1 (en) 1993-04-15 1994-04-15 Coordinately coding and decoding a message signal
AU65475/94A AU6547594A (en) 1993-04-15 1994-04-15 Coordinately coding and decoding a message signal
SE9503590A SE514480C2 (en) 1993-04-15 1995-10-13 Coordinate coding and decoding method for message signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9301236A SE9301236L (en) 1993-04-15 1993-04-15 Method and apparatus for coordinated coding and decoding of a TV signal or other message signal

Publications (2)

Publication Number Publication Date
SE9301236D0 SE9301236D0 (en) 1993-04-15
SE9301236L true SE9301236L (en) 1994-10-16

Family

ID=20389571

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9301236A SE9301236L (en) 1993-04-15 1993-04-15 Method and apparatus for coordinated coding and decoding of a TV signal or other message signal

Country Status (3)

Country Link
AU (1) AU6547594A (en)
SE (1) SE9301236L (en)
WO (1) WO1994024825A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1061744A3 (en) * 1999-04-26 2003-05-14 Sarnoff Corporation Controlling access to a data stream

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789131A (en) * 1972-08-03 1974-01-29 Oak Industries Inc Selective coding system for subscription television
US3885089A (en) * 1973-02-16 1975-05-20 Hughes Aircraft Co Television scrambling system
US4590519A (en) * 1983-05-04 1986-05-20 Regency Electronics, Inc. Television signal scrambling/descrambling system
BE901468A (en) * 1985-01-09 1985-05-02 Belge Radio Television INFORMATION ENCODING AND DECODING METHOD AND APPARATUS FOR IMPLEMENTING IT.
DE3501178A1 (en) * 1985-01-16 1986-07-17 Blaupunkt-Werke Gmbh, 3200 Hildesheim METHOD AND CIRCUIT ARRANGEMENT FOR PREVENTING THE UNAUTHORIZED RECEPTION OF ENCRYPTED TELEVISION SIGNALS
US4817144A (en) * 1987-03-12 1989-03-28 Zenith Electronics Corporation Secure TV scrambling system using framing code switching

Also Published As

Publication number Publication date
WO1994024825A1 (en) 1994-10-27
SE9301236D0 (en) 1993-04-15
AU6547594A (en) 1994-11-08

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