公开(公告)号：EP0543294B1

公开(公告)日：2003-08-27

申请号：EP92119481.7

申请日：1992-11-13

申请人： MACROVISION CORPORATION

发明人： Ryan, John O. ,  Quan, Ronald ,  Holzgrafe, James R. ,  Wonfor, Peter J.

IPC分类号： H04N7/167

CPC分类号： H04N7/1696 ,  H04N7/1693

公开(公告)号：EP1147664A4

公开(公告)日：2003-06-25

申请号：EP00904592

申请日：2000-01-25

申请人： MACROVISION CORP

发明人： RYAN JOHN O ,  HOLZGRAFE JAMES R ,  HOLLAR MARK A

IPC分类号： H04N5/76 ,  H04N5/91 ,  H04N5/913 ,  H04N5/93 ,  H04N7/08 ,  H04N7/081 ,  H04N7/169 ,  H04N7/171 ,  H04N7/167 ,  G11B20/00

CPC分类号： H04N5/913 ,  H04N7/1693 ,  H04N7/1713

摘要： A method and apparatus for modifying a video signal to allow it to carry encoded data which is detectable at a suitably compliant receiver (18) but is not recorded by a conventional video recorder (13). One application is to carry a descrambling key to prevent useful recording (but not viewing) of a scrambled television signal since the key will not be recorded.

公开(公告)号：EP1193980A1

公开(公告)日：2002-04-03

申请号：EP01129533.4

申请日：1996-07-29

申请人： MITSUBISHI DENKI KABUSHIKI KAISHA

发明人： Hiraki, Toshiyuki, c/o Mitsubishi Denki K. K. ,  Yamada, Akira, c/o Mitsubishi Denki K. K. ,  Oki, Masashi, c/o Mitsubishi Denki K. K.

IPC分类号： H04N7/52

CPC分类号： H04N21/2368 ,  H04L7/10 ,  H04N7/1693 ,  H04N7/1713 ,  H04N7/24 ,  H04N19/00 ,  H04N19/61 ,  H04N19/70 ,  H04N21/4305 ,  H04N21/4341 ,  H04N21/4348

摘要： A synchronous control method for a coded signal decoding circuit is disclosed for processing a bit stream consisting of a plurality of successive frames each including sample data of a coded signal to be decoded, and header information having synchronous information indicating a starting position of a frame as a unit of processing and information indicating the frame as a first kind of frame consisting of a relatively small number of sample data per frame or a second kind of frame consisting of a relatively large number of sample data per frame, comprising the steps of: extracting the header information from each frame in said bit stream; detecting whether the state is a synchronized state or an asynchronous state on the basis of the synchronous information included in the extracted header information; judging whether the frame is said first kind or said second kind on the basis of the extracted header information; and performing synchronous control, based on the judgement result on the kind of frame, the synchronous detection result, and the current state, by judging at least whether the next state is a first state indicating an initial state or indicating that the synchronized state has not been detected, a second state indicating that the synchronized state has been detected, a third state indicating that the synchronized state has not been detected in said second state when the contents of said header information indicates the frame is said first kind, or a fourth state indicating that the synchronized state has not been detected in said second state when the contents of said header information indicates the frame is said second kind.

摘要翻译： 公开了一种用于编码信号解码电路的同步控制方法，用于处理包括多个连续帧的比特流，每个连续帧包括要解码的编码信号的采样数据，以及具有指示帧开始位置的同步信息的报头信息 处理单元和指示帧作为由每帧相对较少数量的采样数据组成的第一类帧的信息或由每帧相对大量的采样数据组成的第二类帧，包括以下步骤：提取 所述比特流中的每帧的头信息; 根据所提取的标题信息中包含的同步信息来检测状态是同步状态还是异步状态; 基于提取的标题信息来判断帧是第一种还是第二类; 并且通过至少判断下一状态是指示初始状态的第一状态还是指示同步状态未被指示的状态，基于对帧的种类，同步检测结果和当前状态的判断结果，执行同步控制 检测到第二状态，指示已经检测到同步状态的第二状态，指示当所述头部信息的内容指示该帧是所述第一种时的第三状态，或者表示在所述第二状态中没有检测到同步状态的第三状态，或第四状态 指示当所述头部信息的内容指示所述帧是所述第二种状态时，在所述第二状态下未检测到同步状态。

公开(公告)号：EP0786908A3

公开(公告)日：1999-06-23

申请号：EP96305599.1

申请日：1996-07-29

申请人： MITSUBISHI DENKI KABUSHIKI KAISHA

发明人： Hiraki, Toshiyuki, c/o Mitsubishi Denki K.K. ,  Yamada, Akira, c/o Mitsubishi Denki K.K. ,  Oki, Masashi, c/o Mitsubishi Denki K.K.

IPC分类号： H04N7/52

CPC分类号： H04N21/2368 ,  H04L7/10 ,  H04N7/1693 ,  H04N7/1713 ,  H04N7/24 ,  H04N19/00 ,  H04N19/61 ,  H04N19/70 ,  H04N21/4305 ,  H04N21/4341 ,  H04N21/4348

摘要： A coded-signal decoding circuit in which, when a signal indicating a transition state from a synchronized state to an asynchronous state is outputted from a synchronous state register (8), data "0" generated by a "0" generating circuit (20) are stored in a data memory (10) instead of an output of an audio signal generating circuit (6), thus initializing the data memory (10) in advance. In a conventional coded-signal decoding circuit, when a transition was made from a synchronized state to an asynchronous state after failing to establish synchronization, the data memory (10) had to be initialized at a point in time before starting the next synchronous detection, presenting a problem in terms of time. The invention further provides a synchronous control method.

摘要翻译： 一种编码信号解码电路，其中，当从同步状态寄存器（8）输出指示从同步状态到异步状态的转换状态的信号时，由“0”生成电路（20）生成的数据“0” 被存储在数据存储器（10）中而不是音频信号产生电路（6）的输出，从而预先初始化数据存储器（10）。 在传统的编码信号解码电路中，当在无法建立同步之后从同步状态转换到异步状态时，数据存储器（10）必须在开始下一个同步检测之前的时间点被初始化， 就时间而言存在问题。 本发明还提供了一种同步控制方法。

公开(公告)号：EP0890261A4

公开(公告)日：1999-01-13

申请号：EP96940248

申请日：1996-10-17

IPC分类号： H04N5/91 ,  G11B20/10 ,  G11B27/031 ,  H04N5/782 ,  H04N5/913 ,  H04N7/08 ,  H04N7/087 ,  H04N7/088 ,  H04N7/169 ,  H04N7/171 ,  H04N9/79 ,  H04N7/167

CPC分类号： H04N7/1713 ,  H04N5/913 ,  H04N7/08 ,  H04N7/087 ,  H04N7/088 ,  H04N7/1693 ,  H04N2005/91314 ,  H04N2005/91371

摘要： The invention uses digital techniques for defeating the effects of the analog copy protected signal while the signal is in the digital domain. The types of copy protection signals includes pseudo sync pulses and AGC pulses. Additionally digital techniques may be used for reducing or eliminating the effects of a chroma copy protection process (Figs. 10-14). A digital video copy protection eliminator allows removal of substantially all pseudo sync pulses and/or AGC pulses in the digital domain. The location of pseudo syncs and/or AGC pulses are determined, while the signal is in the digital domain. These known pixel locations of all or some of the pseudo syncs and/or AGC pulses are used to digitally modify the signal so as to effectively remove the pseudo sync pulses and/or AGC pulses.

摘要翻译： 当信号处于数字域时，本发明使用数字技术来消除模拟复制保护信号的影响。 复制保护信号的类型包括伪同步脉冲和AGC脉冲。 另外，数字技术可用于减少或消除色度复制保护过程的影响（图10-14）。 数字视频复制保护消除器允许去除数字域中基本上所有的伪同步脉冲和/或AGC脉冲。 当信号处于数字域时，确定伪同步和/或AGC脉冲的位置。 所有或一些伪同步和/或AGC脉冲的这些已知像素位置被用于数字修改该信号，以便有效地去除伪同步脉冲和/或AGC脉冲。

公开(公告)号：EP0518129A2

公开(公告)日：1992-12-16

申请号：EP92108925.6

申请日：1992-05-27

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Westerfer, Richard ,  Robbins, Clyde ,  Radice, Anthony M.

IPC分类号： H04N7/167

CPC分类号： H04N7/1693

摘要： The scrambling security of a sync suppressed television signal is enhanced by eliminating the fixed time relationship between the normal color burst component and synchronization information in successive lines of the television signal. Transmission of a first plurality of television lines is delayed to achieve a cumulative delay corresponding at least to the duration of a color burst component of the television signal. The transmission of a second plurality of television lines is subsequently accelerated to reduce the cumulative delay. By repeating the delaying and accelerating steps, the location of the color burst component is varied within the television signal over time. Derivation of a substitute horizontal synchronization pulse from the color burst component is thereby prevented.

摘要翻译： 通过消除电视信号的连续行中正常色同步分量和同步信息之间的固定时间关系，增强同步抑制电视信号的加扰安全性。 第一多个电视线路的传输被延迟以实现至少对应于电视信号的色同步分量的持续时间的累积延迟。 随后加速第二多个电视线路的传输以减少累积延迟。 通过重复延迟和加速步骤，颜色突发分量的位置随时间在电视信号内变化。 由此防止了来自色同步分量的替代水平同步脉冲的推导。

公开(公告)号：EP0416894A2

公开(公告)日：1991-03-13

申请号：EP90309714.5

申请日：1990-09-05

申请人： MACROVISION CORPORATION

发明人： Ryan, John O.

IPC分类号： H04N7/167

CPC分类号： H04N7/1693

摘要： A technique for encrypting and decrypting information signals normally arranged as a succession of lines of active information, with each line having a line timing reference, such as color video information signals. The active video portion is time shifted with respect to the horizontal sync portion of the corresponding line using a predetermined slowly varying time shifting function. The time shifting information is conveyed to the decryption site by encoding the instantaneous value of the time shifting wave form for the beginning of each field in the vertical blanking portion of that field. To provide a reasonable maximum time shifting range, portions of the trailing edge of the active video in the preceding line and portions of the leading edge of the active video in the current line are discarded. During decryption, the original line timing and color burst signals are discarded and new signals are generated which are time displaced from the active videos portion by the original amount before encryption.

摘要翻译： 一种用于加密和解密通常布置为有源信息线的连续信息信号，其中每行都有一个行时间基准，：如彩色视频信息信号的技术。 有效视频部分是使用预定的缓变时移函数时移相对于相应行的水平同步部分。 时移信息通过编码的时间在场的垂直消隐部分移波形的每个字段的开始并瞬时值传送到解密站点。 为了提供一个合理的最大时移范围，在preceding-线和电流线的有效视频信号的前缘的部分的有效视频的后缘的部分被丢弃。 在解密期间，原始线定时和彩色脉冲串信号被丢弃，并且新的信号生成哪些时间加密前的原始量从活性部分视频移位。

公开(公告)号：EP0236833A2

公开(公告)日：1987-09-16

申请号：EP87102565.6

申请日：1987-02-24

申请人： TECHNICAL DEVELOPMENTS AND INVESTMENTS EST.

发明人： Zberg, Francois J.

IPC分类号： H04N7/167

CPC分类号： H04N7/1693

摘要： Le procédé d'analyse et de reconnaissance automatique du code de cryptage d'émissions de télévision consiste à évaluer le décalage appliqué à un certain nombre x de lignes successives du cycle de cryptage, puis à rechercher dans une table, l'unique code de cryptage qui donne, en cette position du cycle, la suite des x valeurs de décalage trouvée. Afin d'analyser le décalage de chacune de ces x lignes, le procédé selon l'invention consiste à évaluer, dans un premier temps, le décalage relatif de chacune des x-1 lignes par rapport à la première, par l'étude du décalage relatif d'une transition de luminance donnée qui soit présente sur l'ensemble de ces x lignes et qui, avant cryptage, reflète un détail vertical à l'image puis, dans un deuxième temps, à évaluer le décalage absolude chancune de ces x lignes par comparaison à une ligne parmis les x à laquelle a été appliqué un décalage minimal au cryptage.

摘要翻译： 该方法在于评估应用于加密周期的一定数量x的连续行的移位，然后在表中查找唯一的加密代码，其在该周期的该位置给出针对x移位值找到的序列 。 为了分析这些x行中的每一行的偏移，该方法首先通过研究在所有x线中存在的给定亮度变化的相对偏移来首先评估每个x-1行相对于第一行的相对移位 这些x行在加密之前反映了垂直于图像的细节，其次，在评估这些x行中每一行的绝对偏移量与从最小偏移应用于加密的x的行进行比较时 。

公开(公告)号：EP0140704A3

公开(公告)日：1987-05-20

申请号：EP84307469

申请日：1984-10-30

申请人： R F MONOLITHICS, INC.

发明人： Ragan, Lawrence H. ,  Ash, Darrell L.

IPC分类号： H04N07/167

CPC分类号： H04N7/1693

摘要： © A television scrambling and descrambling system is disclosed. Transmitter circuit (16, 18) switch between any two consecutive segments of a signal causing delay times which differ from each other by a significant fraction of the horizontal sweep time, thereby scrambling the signal. Switches (40, 42) in the descrambler switch between consecutive time segments corresponding in number and complementary in delay times with the scrambler signal consecutive segments. Differences in the delays of the consecutive segments are provided in one arrangement by surface acoustic wave delay lines (22, 37) in one of at least two signal paths. In another case, a delay line comprising a charge-coupled device (CCD) provides the consecutive signal segments having delay times which differ from each other. Horizontal retrace intervals are detected by a pulse generator (26) which drives the switching between paths or provides clock pulses for the CCD during the horizontal intervals. Switching information is modulated on to an interfering signal (28) which is demodulated by an AM demodulator (48) in the descrambler.

摘要翻译： 披露了电视加扰和解扰系统。 发射机电路（16,18）在信号的任何两个连续段之间切换，从而导致延迟时间彼此相差大部分水平扫描时间，由此扰乱信号。 解扰器中的开关（40,42）在连续的时间段之间切换，该连续的时间段的数量与延迟时间互补并且与扰频器信号连续段互补。 通过至少两个信号路径之一中的表面声波延迟线（22,37）以一种布置提供连续段的延迟差异。 在另一种情况下，包括电荷耦合器件（CCD）的延迟线提供具有彼此不同的延迟时间的连续信号段。 水平回扫间隔由脉冲发生器（26）检测，脉冲发生器（26）驱动路径之间的切换或在水平间隔期间为CCD提供时钟脉冲。 切换信息被调制到由解扰器中的AM解调器（48）解调的干扰信号（28）。

公开(公告)号：EP0221739A2

公开(公告)日：1987-05-13

申请号：EP86308293.9

申请日：1986-10-24

申请人： PAYVIEW LIMITED

发明人： Thompson, John Robert ,  Hunting, Curtis Joseph ,  Masson, Ronald K. ,  Trivelpiece, Craig Evan

IPC分类号： H04N7/167

CPC分类号： H04N7/1675 ,  H04N7/1693 ,  H04N7/171

摘要： A multimode scrambling system for video signal transmission systems is described. The system provides for baseband video scrambling controlled by a central originating computer facility. The scrambling of each field of a video changes on a per field basis. The video signal is scrambled in several modes including vertical interval scrambling, alternate line inversion, bogus sync pulse generation, video compression and video offset techniques. A scrambling sequence is sent by a unique algorithm, sent during the vertical interval to each system decoder. The algorithm is reordered for each of a plurality of fields of the video signal and the reordering position is identified by a unique synchronization pulse transmitted during the vertical interval of the video signal. Additional security measures are provided to inhibit a subscriber from avoiding a transmitted disable command, or an attempt to invade the subscriber decoder mechanical packaging security.