MX171988B - AN IMPROVED SELF-CALIBRATION ENCRYPTION - Google Patents

AN IMPROVED SELF-CALIBRATION ENCRYPTION

Info

Publication number
MX171988B
MX171988B MX2051890A MX2051890A MX171988B MX 171988 B MX171988 B MX 171988B MX 2051890 A MX2051890 A MX 2051890A MX 2051890 A MX2051890 A MX 2051890A MX 171988 B MX171988 B MX 171988B
Authority
MX
Mexico
Prior art keywords
encryption
calibration
improved self
encryptor
video
Prior art date
Application number
MX2051890A
Other languages
Spanish (es)
Inventor
William T Murphy
James O Farmer
Lamar E West Jr
Original Assignee
Scientific Atlanta
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 Scientific Atlanta filed Critical Scientific Atlanta
Publication of MX171988B publication Critical patent/MX171988B/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
    • H04N7/171—Systems operating in the amplitude domain of the television signal
    • H04N7/1713—Systems operating in the amplitude domain of the television signal by modifying synchronisation signals
    • 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
    • H04N7/171—Systems operating in the amplitude domain of the television signal
    • H04N7/1716—Systems operating in the amplitude domain of the television signal by inverting the polarity of active picture signal portions

Abstract

La presente invención se refiere a un cifrador (codificador) para utilizarse en un sistema de video que emplea pulsos de sincronización y que comprende: medios para generar una señal de video que tiene una porción de video y una porción de sintonización; y medios para autocalibrar una salida del cifrador, basándose en una operación predeterminada que involucra a los pulsos de sintonización.The present invention relates to an encryptor (encoder) for use in a video system employing synchronization pulses and comprising: means for generating a video signal having a video portion and a tuning portion; and means for auto-calibrating an output of the encryptor, based on a predetermined operation involving the tuning pulses.

MX2051890A 1989-05-01 1990-04-30 AN IMPROVED SELF-CALIBRATION ENCRYPTION MX171988B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US34524089A 1989-05-01 1989-05-01

Publications (1)

Publication Number Publication Date
MX171988B true MX171988B (en) 1993-11-26

Family

ID=23354174

Family Applications (1)

Application Number Title Priority Date Filing Date
MX2051890A MX171988B (en) 1989-05-01 1990-04-30 AN IMPROVED SELF-CALIBRATION ENCRYPTION

Country Status (6)

Country Link
CN (1) CN1024622C (en)
AU (1) AU5534790A (en)
CA (1) CA2015392A1 (en)
GB (1) GB2247808B (en)
MX (1) MX171988B (en)
WO (1) WO1990013973A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998042130A1 (en) * 1997-03-17 1998-09-24 Macrovision Corporation Method and apparatus for adaptively enhancing a scrambled television signal

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075660A (en) * 1972-02-18 1978-02-21 Teleglobe Pay-Tv System, Inc. Pay television system with synchronization suppression
CA1016647A (en) * 1975-07-07 1977-08-30 Edward T. Ball Apparatus for scrambling and unscrambling an amplitude modulated signal
US4257065A (en) * 1979-12-17 1981-03-17 Pay Television Corporation Video clamp and inverter circuit
US4599648A (en) * 1983-05-24 1986-07-08 Nec Corporation Video signal transmission systems

Also Published As

Publication number Publication date
CN1049259A (en) 1991-02-13
GB2247808B (en) 1994-05-18
CN1024622C (en) 1994-05-18
AU5534790A (en) 1990-11-29
WO1990013973A1 (en) 1990-11-15
CA2015392A1 (en) 1990-11-01
GB2247808A (en) 1992-03-11
GB9123261D0 (en) 1991-12-18

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