Video scrambling
    1.
    发明公开
    Video scrambling 失效
    视频加扰

    公开(公告)号:EP0762764A3

    公开(公告)日:1997-07-16

    申请号:EP96306090.0

    申请日:1996-08-21

    申请人: AT&T Corp.

    IPC分类号: H04N7/167

    CPC分类号: H04N7/1696 H04N7/1716

    摘要: A system for scrambling a video signal, wherein multiple modes of scrambling are available, including (i) line reversal, (ii) line inversion, (iii) line permutation, and (iv) block permutation. The invention changes the combination of modes used as time progresses. In addition, particular modes can be implemented, or suppressed, in response to such factors as (i) noise in the transmission channel and (ii) amount of motion within the video image.

    摘要翻译: 一种用于加扰视频信号的系统,其中有多种加扰模式可用,包括(i)行反转,(ii)行反转,(iii)行置换和(iv)块置换。 本发明改变了随着时间进展使用的模式的组合。 另外,响应于诸如(i)传输信道中的噪声和(ii)视频图像内的运动量等因素,可以实现或抑制特定模式。

    Procédé et dispositif de cryptage/décryptage analogique d'un signal vidéo analogique
    2.
    发明公开
    Procédé et dispositif de cryptage/décryptage analogique d'un signal vidéo analogique 失效
    方法及模拟装置加密/解密的模拟视频信号。

    公开(公告)号:EP0309347A1

    公开(公告)日:1989-03-29

    申请号:EP88402382.1

    申请日:1988-09-21

    IPC分类号: H04N7/167

    CPC分类号: H04N7/1716

    摘要: Le procédé de cryptage/décryptage analogique selon l'invention s'applique à un signal vidéo analogique (S) comportant un signal utile (SU) relatif aux lignes de l'image, entrecoupé d'intervalles de retour-ligne (IRL). On fait subir à des parties disjointes du signal utile (SU) une inversion en fonction d'une suite d'informations binaires choisie, possé­dant une allure sensiblement aléatoire, et l'on obtient un signal vidéo inversé (SI). On peut également ajouter à ce signal (SI) un signal perturbateur (SP) tiré d'au moins une forme d'onde, choisie, quasi-aléatoire. Afin que le signal de sortie soit dans un gabarit normalisé, on peut effectuer une compression du signal vidéo et l'on obtient alors fina­lement un signal crypté (SCR). Le procédé de décryptage con­siste à effectuer des opérations inverses du cryptage.

    摘要翻译: 模拟加密/解密方法雅丁到本发明适用于对包括关于所述图象的行的有用信号(SU)的模拟视频信号(S),并且由行逆程时间间隔(IRL)相交。 有用信号(SU)的不相交部分由在反转依赖于具有大致随机的形状的二进制数据的一个所选序列经历,并在反相视频信号(SI)被获得。 因此,一个扰动信号(SP),从至少一个选择,准随机选择的波形,可以被添加到该信号(SI)。 为了没有输出信号应该是一个标准化的模板中,可以将视频信号进行压缩和加密的信号(SCR),因此最终获得。 该解密方法besteht在开展业务逆的加密。

    Video encryption system
    3.
    发明公开
    Video encryption system 失效
    视频加密系统

    公开(公告)号:EP0128770A3

    公开(公告)日:1987-03-25

    申请号:EP84303940

    申请日:1984-06-11

    发明人: Robbins, Clyde N.

    IPC分类号: H04N07/16 H04N07/00

    CPC分类号: H04N7/1716 H04N7/1675

    摘要: An encrypted video distribution system includes a signal- originating head end for scrambling outgoing television program-bearing signals. In particular, the video content of selected lines is inverted about a reference voltage level, and the inversion reference level amplitude transmitted in pulse form during the horizontal synchronizing pulse interval. Line video inversion/non-inversion is controlled by a keyed pseudo random generator. At each authorized subscriber location, all inverted lines are restored to proper format, using the accompanying received inversion amplitude level present during horizontal sync as a reference. A pseudo random generator is included in the receiver descrambling circuitry and operates in a sequence identical to the like circuit atthe head end to identify those lines requiring video inversion.

    Improved video encryption system
    4.
    发明公开
    Improved video encryption system 失效
    Videokodierungssystem。

    公开(公告)号:EP0187483A2

    公开(公告)日:1986-07-16

    申请号:EP85308909.2

    申请日:1985-12-06

    IPC分类号: H04N7/167

    CPC分类号: H04N7/1713 H04N7/1716

    摘要: @ An encrypted video distribution system includes a signal originating station which distributes television signals in a format unrecoverable by a standard television receiver. In particular, the normally occurring vertical and horizonal synchronizing pulses are deleted and, optionally also, video information is selectively inverted about a voltage reference potential intermediate the black and white levels. To permit synchronization restoration, a keying pulse is transmitted once each video field, and a synchronizing digital code burst transmitted once each frame - all at a fixed, predetermined intra-frame timed relationship.
    At each authorized subscriber location, the keying pulse and digital code burst are employed to lock a receiver frame clock which derivatively gives rise to all requisite reception- permitting synchronizing pulses. The transmitted information also contains information sufficient to restore the inverted video program content.

    VIDEO SCRAMBLING WITH VARIABLE FUNCTION GENERATOR
    5.
    发明公开
    VIDEO SCRAMBLING WITH VARIABLE FUNCTION GENERATOR 失效
    具有可变函数发生器视频加密

    公开(公告)号:EP0827670A4

    公开(公告)日:1999-09-01

    申请号:EP96921218

    申请日:1996-05-17

    申请人: PIRES H GEORGE

    发明人: PIRES H GEORGE

    IPC分类号: H04N7/171 H04N7/167

    CPC分类号: H04N7/1716

    摘要: A video scrambling and descrambling arrangement utilizes plural scrambling characteristics including a predetermined scrambling waveform (15) and a selectable one of a plurality of phase relationships (50-57) with respect to the video signal (10) to be scrambled. Descrambling is achieved by combining (117) with the scrambled video signal a correspondingly phase shifted, inverted version of the scrambling signal. Scrambling and descrambling can be implemented in analogue or digital forms. The information required to achieve descrambling is contained in the scrambled video signal, preferably in an unscrambled portion (91) thereof.

    Video scrambling
    6.
    发明公开
    Video scrambling 失效
    Videoverschlüsselung

    公开(公告)号:EP0762764A2

    公开(公告)日:1997-03-12

    申请号:EP96306090.0

    申请日:1996-08-21

    申请人: AT&T Corp.

    IPC分类号: H04N7/167

    CPC分类号: H04N7/1696 H04N7/1716

    摘要: A system for scrambling a video signal, wherein multiple modes of scrambling are available, including (i) line reversal, (ii) line inversion, (iii) line permutation, and (iv) block permutation. The invention changes the combination of modes used as time progresses. In addition, particular modes can be implemented, or suppressed, in response to such factors as (i) noise in the transmission channel and (ii) amount of motion within the video image.

    摘要翻译: 一种用于加扰视频信号的系统,其中多种模式的加扰可用,包括(i)线路反转,(ii)线路倒置,(iii)线路排列和(iv)块排列。 本发明改变了随时间推移使用的模式的组合。 此外,响应于诸如(i)传输信道中的噪声和(ii)视频图像内的运动量等因素,可以实现或抑制特定模式。

    Dispositif pour indiquer la polarité d'un signal vidéo
    7.
    发明公开
    Dispositif pour indiquer la polarité d'un signal vidéo 失效
    Vorrichtung zum Anzeigen derPolaritäteines Videosignales。

    公开(公告)号:EP0456324A1

    公开(公告)日:1991-11-13

    申请号:EP91201077.4

    申请日:1991-05-06

    IPC分类号: H04N5/46 H04N7/167

    CPC分类号: H04N7/1716 H04N5/46

    摘要: Le dispositif est muni d'un compteur (21) pour compter, pendant un signal de suppression de trame, les signaux de synchronisation de ligne appliqués à son entrée d'horloge (CP). L'entrée (CEP) d'autorisation de comptage du compteur rerçoit un signal dont la durée correspond à la durée de cinq demi-lignes. Le compteur repart à zéro lorsqu'il a compté cinq signaux, en indiquant alors sur une sortie spécifique (TC) que le comptage a atteint cinq, et cette sortie (TC) est reliée à un circuit logique (14 à 18), qui fournit à chaque fin d'intervalle de suppression de trame un signal binaire (19) qui reste inchangé lorsque le chiffre de comptage du compteur a atteint cinq et qui est inversé dans le cas contraire. Ce signal binaire commande un démodulateur pour l'adapter à la polarité.
    Application : Récepteurs de télévision, soit multistandards, soit dans lesquels il est nécessaire de reconnaître la polarité d'un signal video qui est inversé par rapport au signal normal d'une norme d'émission donnée, par exemple dans le but de renforcer un brouillage.

    摘要翻译: 该装置设置有计数器(21),用于在帧抑制信号期间对施加到其时钟输入(CP)的行同步信号进行计数。 计数器的计数使能输入(CEP)接收一个持续时间对应于五个半线的持续时间的信号。 当它计数了五个信号时,计数器从零开始,然后在特定输出(TC)上指示计数已经达到5,并且该输出(TC)连接到逻辑电路(14至18),其在 每个帧抑制间隔的结束传送一个二进制信号(19),当计数器的计数位数达到5并在相反的情况下被反转时保持不变。 该二进制信号控制解调器以使其适应极性。 应用:电视接收机,无论是多标准还是需要确定相对于给定广播标准的正常信号而反转的视频信号的极性,例如用于加强加扰的目的。

    Improved video encryption system
    8.
    发明公开
    Improved video encryption system 失效
    改进的视频加密系统

    公开(公告)号:EP0187483A3

    公开(公告)日:1987-07-29

    申请号:EP85308909

    申请日:1985-12-06

    IPC分类号: H04N07/167

    CPC分类号: H04N7/1713 H04N7/1716

    摘要: @ An encrypted video distribution system includes a signal originating station which distributes television signals in a format unrecoverable by a standard television receiver. In particular, the normally occurring vertical and horizonal synchronizing pulses are deleted and, optionally also, video information is selectively inverted about a voltage reference potential intermediate the black and white levels. To permit synchronization restoration, a keying pulse is transmitted once each video field, and a synchronizing digital code burst transmitted once each frame - all at a fixed, predetermined intra-frame timed relationship. At each authorized subscriber location, the keying pulse and digital code burst are employed to lock a receiver frame clock which derivatively gives rise to all requisite reception- permitting synchronizing pulses. The transmitted information also contains information sufficient to restore the inverted video program content.

    Scrambling system of television signal
    9.
    发明公开
    Scrambling system of television signal 失效
    VerfürrenZumVerwürfelnvon Fernsehsignalen。

    公开(公告)号:EP0119751A1

    公开(公告)日:1984-09-26

    申请号:EP84301033.1

    申请日:1984-02-17

    IPC分类号: H04N7/16

    摘要: A scrambling system of television signal includes a circuit for eliminating vertical sync pulses in a vertical sync pulse period and equivalent pulses in first and second equivalent pulse periods at opposite ends of said vertical sync pulse period. In place of the eliminated pulses, substitute pulses having a frequency equal to an integer times the frequency of horizontal sync pulses are deposited. A framing code inserting circuit is provided for inserting at least one framing code in the substituted pulses. The framing code is carrying information how the television signal is scrambled.

    摘要翻译: 电视信号的加扰系统包括用于消除垂直同步脉冲周期中的垂直同步脉冲的电路和在所述垂直同步脉冲周期的相对端的第一和第二等效脉冲周期中的等效脉冲。 代替消除的脉冲,存储具有等于水平同步脉冲的频率的整数倍的频率的替代脉冲。 提供成帧代码插入电路用于在取代脉冲中插入至少一个成帧码。 成帧代码携带信号如何扰乱电视信号。

    Universal decoder
    10.
    发明公开
    Universal decoder 失效
    通用解码器

    公开(公告)号:EP0409211A2

    公开(公告)日:1991-01-23

    申请号:EP90113788.5

    申请日:1990-07-18

    IPC分类号: H04N7/167

    CPC分类号: H04N7/1713 H04N7/1716

    摘要: A microprocessor based decoder module for television video signals which have been encoded by suppressing sync pulses and/or inverting picture video. The decoder module generates sync restoration gates and/or video inversion gates developed from timing signals present in the VBI of the encoded video signal. The VBI timing signals may be either sync pulses which are not suppressed during the VBI, or special timing signals inserted at the video encoder. The microprocessor, in the decoder module, may contain externally selectable program segments where each segment will allow decoding of a different variety of video encoding.

    摘要翻译: 一种用于电视视频信号的基于微处理器的解码器模块,其通过抑制同步脉冲和/或反转图像视频而被编码。 解码器模块产生从存在于编码视频信号的VBI中的定时信号开发的同步恢复门和/或视频反转门。 VBI定时信号可以是在VBI期间未被抑制的同步脉冲,或是在视频编码器处插入的特殊定时信号。 解码器模块中的微处理器可以包含可从外部选择的程序段,其中每个段将允许解码不同种类的视频编码。