Method and device for driving a lamp
    2.
    发明授权
    Method and device for driving a lamp 有权
    用于驱动灯的方法和装置

    公开(公告)号:US09025966B2

    公开(公告)日:2015-05-05

    申请号:US13381382

    申请日:2010-01-07

    IPC分类号: H04B10/00 H05B37/02

    CPC分类号: H05B37/0272

    摘要: A method for driving a lamp (2) comprises the steps of: generating a lamp current (ICONST) having a constant magnitude; defining a commutation period having a duration TCOMM; defining a time base of original commutation moments, having fixed mutual intervals of 0.5*TCOMM; receiving data to be embedded in the light output; commutating the lamp current at commutation moments; wherein individual commutations are time-modulated in order to encode said received data. Preferably, a commutation moment is: either equal to an original commutation moment if there are no data to embed; or advanced over a modulation distance (Δ) with respect to the corresponding original commutation moment in order to encode data having a first value (“0”); or delayed over said modulation distance (Δ) with respect to the corresponding original commutation moment in order to encode data having a second value (“1”).

    摘要翻译: 一种用于驱动灯(2)的方法包括以下步骤:产生具有恒定幅度的灯电流(ICONST); 定义具有持续时间TCOMM的换向周期; 定义原始换向力矩的时基,具有0.5 * TCOMM的固定相互间隔; 接收要嵌入光输出的数据; 在换向时刻整流灯电流; 其中单个换向被时间调制以便对所接收的数据进行编码。 优选地,换向力矩是:如果不存在要嵌入的数据,则等于原始换向力矩; 或相对于相应的原始换向时刻在调制距离(&Dgr))上前进,以便编码具有第一值(“0”)的数据; 或相对于相应的原始换向时刻延迟所述调制距离(&Dgr),以便编码具有第二值(“1”)的数据。

    Method and system of copy protection of information
    3.
    发明授权
    Method and system of copy protection of information 失效
    信息复制保护方法与系统

    公开(公告)号:US07340152B1

    公开(公告)日:2008-03-04

    申请号:US09548727

    申请日:2000-04-13

    摘要: The invention relates to a method of copy-protection of information stored on an information carrying medium. The method allows a reading device (e.g. a DVD drive) and an application device (e.g. an MPEG decoder) to exchange copy-protection information regarding the information carrying medium (e.g. an optical record carrier like a CD or DVD) and the content on that medium. The method is cryptographically secure, taking into account the situation where reading device and application device are connected to an open bus in a personal computer. In view of the high-volume nature of the drive, the method can be implemented cheaply. The inventive method is robust against a so-called man-in-the-middle attack.The invention relates also to a method of exchanging copy-protection information, to a copy-protection system and to devices for carrying out these methods, in particular a reading device, an application device and a device for playback and/or recording of information.

    摘要翻译: 本发明涉及一种存储在信息载体上的信息的复制保护方法。 该方法允许读取设备(例如,DVD驱动器)和应用设备(例如MPEG解码器)交换关于信息携带介质(例如光学记录载体,如CD或DVD)的复制保护信息,以及该内容 中。 该方法是加密安全的,考虑到读取设备和应用设备连接到个人计算机中的开放总线的情况。 鉴于驱动器的大容量性质,该方法可以廉价地实现。 本发明的方法对所谓的中间人攻击是强大的。 本发明还涉及一种将拷贝保护信息交换到拷贝保护系统和用于执行这些方法的设备的方法,特别是读取设备,应用设备和用于回放和/或记录信息的设备。

    Copy protection schemes for copy protected digital material
    4.
    发明授权
    Copy protection schemes for copy protected digital material 失效
    复制保护数字材料的保护方案

    公开(公告)号:US06473560B1

    公开(公告)日:2002-10-29

    申请号:US09271745

    申请日:1999-03-18

    IPC分类号: H04N591

    摘要: Recent copy-protection schemes for digital video copy-protection rely on a pixel-watermark together with the presence of a ‘ticket’ to implement the ‘copy-once’ state of content. This ticket is designed to entitle the owner of a disk/tape to making one copy of digital content. We disclose a method to pass along this ticket with the video signal after content has been converted to the analog domain. This form of the ticket is called the analog ticket. The analog signal may be recorded on a legacy device that does not comply with the copy-protection scheme (e.g. ordinary VCRs). The analog ticket is designed such that it is automatically removed in these legacy devices. Next generation copies by compliant devices are made impossible. Three possible ways of embedding the ticket signal into the analog video signal are proposed.

    摘要翻译: 用于数字视频拷贝保护的最近的复制保护方案依赖于像素水印以及存在“票据”以实现“一次复制”状态的内容。 该票旨在使磁盘/磁带的所有者授权制作数字内容的一个副本。 在内容转换为模拟域之后,我们披露了一种使用视频信号传递该故障单的方法。 这张票的形式叫做模拟票。 模拟信号可以记录在不符合复制保护方案(例如普通VCR)的传统设备上。 模拟票据的设计使其在这些传统设备中被自动删除。 不符合兼容设备的下一代副本是不可能的。 提出了将票信号嵌入模拟视频信号的三种可能方式。

    System for transferring content information and supplemental information relating thereto
    6.
    发明授权
    System for transferring content information and supplemental information relating thereto 失效
    用于传送内容信息的系统和与其相关的补充信息

    公开(公告)号:US06314518B1

    公开(公告)日:2001-11-06

    申请号:US09140814

    申请日:1998-08-26

    IPC分类号: G06F124

    摘要: A system for copy protecting content information has an arrangement for receiving and controlling the playback of encoded video. The video content, e.g. MPEG compressed digital video, is watermarked and includes a control signal indicating the status (e.g. playback only, one generation of copy allowed, etc). In the receiver device a check is performed to allow playback in dependence of the watermark. The watermark is extracted in a separate decoder device, such as an external MPEG decoder. The receiver device starts the playback via the external decoder, and the separate decoder communicates retrieved watermark information via a link to the playback device. The playback device checks the watermark information against further supplemental information, such as a physical mark on the record carrier or the control signal. Said communication may be protected by cryptographic methods, such as a digital signature.

    摘要翻译: 用于复制保护内容信息的系统具有用于接收和控制编码视频的重放的布置。 视频内容,例如 MPEG压缩数字视频被加水印并且包括指示状态(例如仅播放,允许的一代复制等)的控制信号。 在接收机设备中,执行检查以允许根据水印进行播放。 在诸如外部MPEG解码器的单独的解码器设备中提取水印。 接收机设备通过外部解码器开始播放,并且分离的解码器经由到播放设备的链接来传送检索到的水印信息。 回放装置根据进一步的补充信息来检查水印信息,例如记录载体上的物理标记或控制信号。 所述通信可以通过诸如数字签名的加密方法来保护。

    Record carrier, playback device and method of recording information
    7.
    再颁专利
    Record carrier, playback device and method of recording information 有权
    记录载体,播放设备和记录信息的方法

    公开(公告)号:USRE44659E1

    公开(公告)日:2013-12-24

    申请号:US12129756

    申请日:2008-05-30

    IPC分类号: G11B7/00

    摘要: A record carrier has substantially parallel tracks having first variations of a first physical parameter and second variations of a second physical parameter of the track. The first variations represent information recorded on the record carrier, this information being recoverable by a controllable type of data processing. A modulation pattern of the second variations represents a code for controlling the type of data processing. In respect of a code track that includes the modulation pattern, the modulation pattern in the left neighboring track is aligned to the modulation pattern in the right neighboring track. Thereby crosstalk due to the second variations is decreased, and at least two tracks have the same modulation pattern. The playback device has a demodulator (50) and a control unit (56) for retrieving the code from at least two tracks.

    摘要翻译: 记录载体具有基本平行的轨道,其具有第一物理参数的第一变化和轨道的第二物理参数的第二变化。 第一个变化表示记录在记录载体上的信息,该信息可通过可控制的数据处理类型进行恢复。 第二变型的调制模式表示用于控制数据处理类型的代码。 对于包括调制图案的码道,左邻近轨道中的调制图案与右相邻轨道中的调制图案对准。 由此,由于第二变化引起的串扰减少,并且至少两个磁道具有相同的调制模式。 回放装置具有用于从至少两个轨道检索代码的解调器(50)和控制单元(56)。

    Record carrier, playback device and method of recording information
    9.
    发明授权
    Record carrier, playback device and method of recording information 失效
    记录载体,播放设备和记录信息的方法

    公开(公告)号:US06549495B1

    公开(公告)日:2003-04-15

    申请号:US09488027

    申请日:2000-01-20

    IPC分类号: G11B7007

    摘要: A record carrier has substantially parallel tracks, which exhibit first variations of a first physical parameter and second variations of a second physical parameter of the track. The first variations represent information recorded on the record carrier, which information is recoverable by means of a controllable type of data processing. A modulation pattern of the second variations represents a code for controlling the type of data processing. With respect to a code track that includes the modulation pattern, the modulation pattern in the left neighboring track is aligned to the modulation pattern in the right neighboring track. Thereby crosstalk due to the second variations in decreased, and at least two tracks have the same modulation pattern. The playback device has a demodulator and a control unit for retrieving the code from at least two tracks.

    摘要翻译: 记录载体具有基本平行的轨道,其表现出轨道的第一物理参数和第二物理参数的第二变化的第一变化。 第一个变化表示记录在记录载体上的信息,该信息可通过可控制的数据处理类型进行恢复。 第二变型的调制模式表示用于控制数据处理类型的代码。 对于包括调制图案的代​​码轨道,左侧相邻轨道中的调制图案与右侧相邻轨道中的调制图案对准。 从而由于减少的第二变化引起的串扰和至少两个磁道具有相同的调制模式。 回放装置具有解调器和用于从至少两个轨道检索代码的控制单元。