CO4370139A1 - Sistema de modulacion y desmodulacion de imagenes de television codificada, que permite la compatibilidad con distintos sistemas de ese tipo - Google Patents

Sistema de modulacion y desmodulacion de imagenes de television codificada, que permite la compatibilidad con distintos sistemas de ese tipo

Info

Publication number
CO4370139A1
CO4370139A1 CO95033141A CO95033141A CO4370139A1 CO 4370139 A1 CO4370139 A1 CO 4370139A1 CO 95033141 A CO95033141 A CO 95033141A CO 95033141 A CO95033141 A CO 95033141A CO 4370139 A1 CO4370139 A1 CO 4370139A1
Authority
CO
Colombia
Prior art keywords
video signals
signals
demodulation
modulation
video
Prior art date
Application number
CO95033141A
Other languages
English (en)
Inventor
Martin Thomas Forde
Original Assignee
Gen Instrument Corp
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 Gen Instrument Corp filed Critical Gen Instrument Corp
Publication of CO4370139A1 publication Critical patent/CO4370139A1/es

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
    • H04N7/1716—Systems operating in the amplitude domain of the television signal by inverting the polarity of active picture signal portions
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

1. UN SISTEMA DE MODULACION Y DESMODULACION DE SE- NALES DE VIDEO, CARACTERIZADO POR: UN MECANISMO DE ENTRADA DE VIDEO, PARA PROPORCIO- NAR DE VIDEO A TRANSMITIRSE DESE UNA ESTACION CEN- TRAL A UNA PLURALIDAD DE LOCALIDADES DE ABONADOS; UN MECANISMO MODULADOR SITUADO EN LA ESTACION CENTRAL, PARA MODULAR SENALES DE VIDEO DE ACUERDO A MODALIDADES DE MODULACION Y DESMODULACION PREDE- TERMINADAS; UN MECANISMO DE SENALES PARA GENERAR SENALES INDI- CADORAS CODIFICADAS Y PARA INSERTAR LAS MISMAS EN POSICIONES ELEGIDAS DE LAS SENALES DE VIDEO DESDE EL MECANISMO DE ENTRADA DE VIDEO, Y PARA TRANSMI- TIR LAS SENALES DE VIDEO CON SENALES INDICADORAS INSERTADAS AL MECANISMO MODULADOR, UN MECANISMO PARA TRANSMITIR SENALES INDICADORAS Y DE VIDEO DESDE EL MECANIMSO MODULADOR EN LA ES- TACION CENTRAL HASTA LAS LOCALIDADES DE LOS ABONA- DOS; Y UN MECANISMO DESMODULADOR, SITUADO EN LA LOCALIDAD DE ABONADO Y ACOPLADO AL MECANISMO TRANSMISOR, PARA DETECTAR Y DECODIFICAR LAS SENA- LES INDICADORAS CODIFICADAS EN LAS SENALES DE VI- DEO, Y BAJO EL CONTROL DE SENALES INDICADORAS DECODIFICADAS, PARA DECODIFICAR LAS SENALES DE VIDEO EN FORMA INDEPENDIENTE, Y SIN TOMAR EN CUEN- TA LAS MODALIDADES DE DESMODULACION PREDETERMINA- DAS, Y PARA TRANSMITIR SENALES DE VIDEO DE TAL MA- NERA QUE EL MECANISMO DESMODULADOR SEA COMPATIBLE DENTRO DEL SISTEMA. 8. UN METODO PARA MODULAR Y DESMOLUDAR SENALES DE VIDEO EN UN SISTEMA DE TV, CON UNA ESTACION CEN- TRAL Y UNA PLURALIDAD DE LOCALIDADES RECEPTORAS, CARACTERIZADO POR LOS SIGUIENTES PROCEDIMIENTOS: LA TRANSMISION DE SENALES DE VIDEO QUE SERAN MODU- LADAS EN LA ESTACION CENTRAL, LA GENERACION DE SENALES INDICADORAS CODIFICADAS; LA INSERCION DE LAS SENALES INDICADORAS EN LINEAS SELECCIONADAS DE LAS SENALES DE VIDEO ANTES DE LA MODULACION; LA MODULACION, DE ACUERDO A MODALIDADES DE MODULA- CION Y DESMODULACION PREDETERMINADAS, DE LAS SENA- LES DE VIDEO CON LAS SENALES INDICADORAS INSERTA- DAS; LA TRANSMISION DE LAS SENALES DE VIDEO MODULADAS A UNA PLURALIDAD DE LOCALIDADES; Y LA DESMODULACION DE LAS SENALES DE VIDEO RECIBIDAS EN UNA PRIMERA LOCALIDAD, POR LA DETECCION Y DECO- DIFICACION DE LAS SENALES INDICADORAS PARA DETER- MINAR EN FORMA CONTINUA SI LAS SENALES DE VIDEO FUERON MODULADAS O NO, Y EL USO DE ESA INFORMACION PARA DECODIFICAR LAS SENALES DE VIDEO EN FORMA IN- DEPENDIENTE DE LA MODULACION Y DESMODULACION PRE- DETERMINADAS, DE TAL MANERA QUE HAYA UNA PLENA COMPATIBILIDAD DENTRO DEL SISTEMA, CUANDO SE DES- MODULA EN DISTINTAS LOCALIDADES CON UNA O MAS MO- DALIDADES DE DESMODULACION. FIGURA 1
CO95033141A 1994-07-27 1995-07-26 Sistema de modulacion y desmodulacion de imagenes de television codificada, que permite la compatibilidad con distintos sistemas de ese tipo CO4370139A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/281,415 US5539823A (en) 1994-07-27 1994-07-27 Subscription television picture scrambling and descrambling system providing compatibility with different such systems

Publications (1)

Publication Number Publication Date
CO4370139A1 true CO4370139A1 (es) 1996-10-07

Family

ID=23077195

Family Applications (1)

Application Number Title Priority Date Filing Date
CO95033141A CO4370139A1 (es) 1994-07-27 1995-07-26 Sistema de modulacion y desmodulacion de imagenes de television codificada, que permite la compatibilidad con distintos sistemas de ese tipo

Country Status (4)

Country Link
US (1) US5539823A (es)
AU (1) AU3277395A (es)
CO (1) CO4370139A1 (es)
WO (1) WO1996003838A1 (es)

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US8645988B2 (en) 2002-12-13 2014-02-04 Sony Corporation Content personalization for digital content
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Also Published As

Publication number Publication date
AU3277395A (en) 1996-02-22
US5539823A (en) 1996-07-23
WO1996003838A1 (en) 1996-02-08

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