公开(公告)号：US6115183A

公开(公告)日：2000-09-05

申请号：US632934

申请日：1996-04-16

申请人： Khaled Sarayeddine ,  Eric Marcellin-Dibon ,  Valtor Drazic

发明人： Khaled Sarayeddine ,  Eric Marcellin-Dibon ,  Valtor Drazic

IPC分类号： G02F1/13 ,  G02B3/00 ,  G02F1/1335 ,  G02F1/13357 ,  G03B21/10 ,  G03B21/14 ,  G03B21/20 ,  G09F9/00 ,  H04N5/74 ,  G02B27/10

CPC分类号： G02B27/0927 ,  G02B27/0961 ,  G02B3/0056

摘要： The disclosure relates to a device for illumination of a screen, notably a liquid-crystal screen. It includes a light integrator that receives a light beam from a source and outputs an illuminating beam for the screen. The light integrator makes use of lenses, but has no lenses in the parts of the beam where the energy flux is weak, which enables more uniform illumination of the screen. To improve the contrast of the illumination of the liquid-crystal screen, the whole illuminating beam is directed onto the screen at an angle to the optical axis of the system. The invention is applicable to liquid-crystal screens.

摘要翻译： 本发明涉及一种用于照明屏幕的设备，特别是液晶屏幕。 它包括光积分器，其接收来自源的光束并输出用于屏幕的照明光束。 光积分器使用透镜，但是在能量通量较弱的光束部分中没有透镜，这使得屏幕更均匀的照明。 为了提高液晶屏的照明对比度，整个照明光束以与系统的光轴成一定角度被引导到屏幕上。 本发明适用于液晶屏。

公开(公告)号：US6111371A

公开(公告)日：2000-08-29

申请号：US130820

申请日：1998-08-07

申请人： William Benjamin Aaron ,  Ronald Eugene Fernsler

发明人： William Benjamin Aaron ,  Ronald Eugene Fernsler

IPC分类号： H04N3/16 ,  G09G1/00 ,  G09G1/04 ,  H04N3/23 ,  H04N3/233 ,  H04N3/27 ,  H01J29/70

CPC分类号： H04N3/233 ,  H04N3/27

摘要： A scan frequency detector is responsive to a horizontal synchronization signal to generate a data signal that is indicative of the horizontal scan frequency. A digital-to-analog (D/A) converter produces from the data signal an analog, output signal at a first level, when the horizontal frequency is within a first range of values, at a second level, when the horizontal frequency is within a second range of values and at a third level, when the horizontal frequency is within a third range of values. A first switch of a switched S-capacitor arrangement, is turned on, when the output signal is at the first level. The first switch and a second switch of the switched S-capacitor arrangement, are turned on, when the output signal is at the second level. Both the first and second switches are turned off, when the output signal is at the third level. The third and second levels are distinguished by a level detector that includes a zener diode.

摘要翻译： 扫描频率检测器响应于水平同步信号以产生指示水平扫描频率的数据信号。 数字 - 模拟（D / A）转换器在水平频率处于第一级时在水平频率处于第一值范围内时从数据信号产生模拟输出信号 当水平频率在值的第三范围内时，第二范围值和第三水平。 当输出信号处于第一电平时，开关S电容器装置的第一开关导通。 当输出信号处于第二电平时，开关S电容器装置的第一开关和第二开关导通。 当输出信号处于第三级时，第一和第二开关都被关闭。 第三和第二电平由包括齐纳二极管的电平检测器区分。

公开(公告)号：US6091818A

公开(公告)日：2000-07-18

申请号：US901842

申请日：1997-07-28

申请人： Arnaldo Campinos ,  Jean-Bernard Fischer

发明人： Arnaldo Campinos ,  Jean-Bernard Fischer

IPC分类号： H04L9/32 ,  G09C1/00 ,  H04N7/16 ,  H04N7/167 ,  H04K1/00

CPC分类号： H04N7/163 ,  H04N21/26606 ,  H04N21/4181 ,  H04N21/4623 ,  H04N7/1675

摘要： The invention relates to a conditional access system making it possible for a service provider to supply his services solely to users having acquired entitlements to these services.The services supplied by a service provider consist of an item scrambled by control words. To keep these control words secret, they are supplied in messages (MEC) after having been encrypted with an encryption algorithm with key K.According to the invention, one and the same message (MEC) contains the same control word (Cwi) encrypted several times, each encryption (E(Cwi)Kj) of the control word depending on a different encryption key (Kj).The invention applies to any type of conditional access system, be this system either of "off-line" or "on-line" type.

摘要翻译： 本发明涉及一种条件访问系统，使得服务提供商仅将其服务提供给已获得这些服务的权利的用户成为可能。 由服务提供商提供的服务由控制字加扰的项目组成。 为了保持这些控制字的秘密，在用密钥K加密算法加密之后，它们被提供在消息（MEC）中。根据本发明，一个相同的消息（MEC）包含相同的控制字（Cwi）加密的几个 次，根据不同的加密密钥（Kj）的控制字的每个加密（E（Cwi）Kj）。 本发明适用于任何类型的条件访问系统，该系统是“离线”或“在线”类型。

公开(公告)号：US6035038A

公开(公告)日：2000-03-07

申请号：US884343

申请日：1997-06-27

申请人： Arnaldo Campinos ,  Jean-Bernard Fischer

发明人： Arnaldo Campinos ,  Jean-Bernard Fischer

IPC分类号： G07F7/10 ,  H04L9/32 ,  H04N7/16 ,  H04N7/167 ,  H04L9/08

CPC分类号： G07F7/1008 ,  G06Q20/341 ,  G06Q20/4097 ,  H04L9/0822 ,  H04N21/26606 ,  H04N21/4181 ,  H04N21/4623 ,  H04N7/163 ,  H04N7/1675 ,  H04L2209/601

摘要： The conditional access system of the present invention allows a service provider to supply services, which may be scrambled by a control word, only to those users who have acquired entitlements to these services. The control word is supplied in Entitlement Control Messages (ECM) after having been encrypted using a key. The entitlements of each user are forwarded in Entitlement Management Messages which contain the key. The conditional access system verifies and validates the ECM and EMM prior to processing the control word.

摘要翻译： 本发明的条件访问系统允许服务提供商仅向获得这些服务的权利的用户提供可以由控制字加扰的服务。 使用密钥加密后，控制字在授权控制消息（ECM）中提供。 每个用户的权利在包含密钥的授权管理消息中转发。 条件访问系统在处理控制字之前验证并验证ECM和EMM。

公开(公告)号：US6023294A

公开(公告)日：2000-02-08

申请号：US581573

申请日：1996-05-16

申请人： Fathy Yassa

发明人： Fathy Yassa

IPC分类号： H03M7/40 ,  H04N1/41 ,  H04N7/26 ,  H04N7/30 ,  H04N7/24

CPC分类号： H03M7/40 ,  H04N19/149 ,  H04N19/182 ,  H04N19/60 ,  H04N19/13 ,  H04N19/146 ,  H04N19/91

摘要： The invention is a process and apparatus for estimating a bit budget in a circuit for compressing digital data, especially digitized television signals. Signals represented by N-bit coded samples, are estimated based upon the probability of a bit of given order having a given value (0 or 1) out of M binary words representing M samples of the signal. An entropy calculation is performed on the basis of the probabilities corresponding to the N bits with the sum of all the entropies corresponding to the desired estimate.

摘要翻译： PCT No.PCT / FR94 / 00900 Sec。 371日期：1996年5月16日 102（e）日期1996年5月16日PCT提交1994年7月19日PCT公布。 公开号WO95 / 03673 日期1995年2月2日本发明是用于估计用于压缩数字数据，特别是数字化电视信号的电路中的比特预算的方法和装置。 由N位编码样本表示的信号基于表示信号的M个采样的M个二进制字中具有给定值（0或1）的给定次序的位的概率来估计。 基于与所述N个比特对应的概率与对应于期望估计的所有熵的总和进行熵计算。

公开(公告)号：US6021200A

公开(公告)日：2000-02-01

申请号：US703596

申请日：1996-08-23

申请人： Jean-Bernard Fischer

发明人： Jean-Bernard Fischer

IPC分类号： G06Q20/38 ,  G07C13/00 ,  H04L9/00

CPC分类号： G07C13/00 ,  G06Q20/383

摘要： The system includes a plurality of decision units, at least one verification unit, and at least one counting unit, the units being functionally and structurally separate from each other. Each decision unit includes means for producing a source information item and an identity information item, and means for enciphering this source information item in such a way as to render it essentially indecipherable by the verification unit but decipherable by the counting unit. The verification unit includes a file which includes the identities of the decision units, means for checking the identity of the decision unit from which an incoming message originates, and means for compiling an anonymous derived message which is essentially devoid of any identity information item decipherable by the counting unit. The counting unit includes means for receiving the derived messages from the verification unit, means for processing these messages to compile a statistic of the corresponding source information items, and generating a file of the statistics thus compiled.

摘要翻译： 该系统包括多个决定单元，至少一个验证单元和至少一个计数单元，该单元在功能和结构上彼此分离。 每个决定单元包括用于产生源信息项目和身份信息项目的装置，以及用于以这样一种方式加密该源信息项目的装置，以使得其基本上由验证单元不可解密，但可由计数单元解密。 验证单元包括包括决定单元的身份的文件，用于检查来自其的来自消息的判定单元的身份的装置，以及用于编译匿名导出消息的装置，该匿名派生消息基本上没有可解密的任何身份信息项 计数单位。 计数单元包括用于从验证单元接收导出的消息的装置，用于处理这些消息以编译对应的源信息项的统计量的装置，以及生成如此编译的统计信息的文件。

公开(公告)号：US6005872A

公开(公告)日：1999-12-21

申请号：US682186

申请日：1996-07-17

申请人： Thierry Bassi ,  Claude Rambault

发明人： Thierry Bassi ,  Claude Rambault

IPC分类号： H03M1/66 ,  H04B14/00 ,  H04J3/06 ,  H04L7/04 ,  H04N7/24 ,  H04J3/18

CPC分类号： H04N21/23406 ,  H04J3/0632 ,  H04N21/4305 ,  H04N21/44004

摘要： The disclosure relates to a method of synchronization of clocks wherein, in a system including a digital decoder of a receiver equipped with a sampling clock and a digital encoder of an transmitter also equipped with a sampling clock, said method includes the following stages: in the transmitter, coding by packets of samples of a signal by time intervals of predetermined duration and triggering of the transmission of a data frame when a packet of data is ready to be sent; in the receiver, detection of start of said frame, and generation of a reference signal following said detection, said reference signal being used to correct the clock of the receiver. Another object of the invention is a method of synchronization of clocks wherein, in a system including a digital decoder of a receiver equipped with a sampling clock and a digital encoder of a transmitter also equipped with a sampling clock, in which the transmitter sends frames containing data packets corresponding to a number known of samples, said method includes the following stages in the receiver: reception of a data frame including a packet of data, decoding of said packet and writing of the decoded data in a memory, reading of said decoded data in said memory at a frequency that is a function of the frequency of said clock of the decoder, comparison at a predetermined time of the occupancy of said memory with respect to a threshold, and correction of said clock of the decoder according to the result of said comparison. The invention is applicable in the field of digital transmission, notably transmissions between digital visiophones.

摘要翻译： 本公开涉及一种时钟同步的方法，其中在包括配备有采样时钟的接收机的数字解码器和具有采样时钟的发射机的数字编码器的系统中，所述方法包括以下阶段：在 发射机，通过预定时间间隔的信号样本的分组进行编码，并且当数据分组准备好发送时触发数据帧的传输; 在接收机中，检测所述帧的开始，以及在所述检测之后产生参考信号，所述参考信号用于校正接收机的时钟。 本发明的另一个目的是一种时钟同步的方法，其中在包括配备有采样时钟的接收机的数字解码器和还配备有采样时钟的发射机的数字编码器的系统的系统中，发射机发送包含 数据包对应于已知样本的数量，所述方法包括在接收机中的以下阶段：接收包括数据包的数据帧，解码所述分组并将解码数据写入存储器，读取所述解码数据 在所述存储器中以与解码器的所述时钟的频率相关的频率的频率，在所述存储器占用相对于阈值的预定时间进行比较，以及根据所述解码器的结果校正所述解码器的所述时钟 说比较。 本发明可应用于数字传输领域，特别是数字可视电话之间的传输。

公开(公告)号：US5990993A

公开(公告)日：1999-11-23

申请号：US690900

申请日：1996-08-01

申请人： Gunther Haas

发明人： Gunther Haas

IPC分类号： G02F1/1335 ,  G02F1/1333

CPC分类号： G02F1/133504 ,  G02F1/133514

摘要： A display device having a backlighting system supplying collimated light, a transmissive electro-optical modulator of the liquid crystal display type and a means for distributing the light angularly. The distance between the means for distributing the light angularly and the display is chosen so as to obtain a spatial filtration effect. A layer of colored filters is positioned between the display and the means for distributing the light angularly.

摘要翻译： 具有提供准直光的背光系统的显示装置，液晶显示型的透射电光调制器和用于分光的装置。 选择用于分配光的装置与显示器之间的距离，以获得空间过滤效果。 一层彩色滤光片位于显示器和用于分布光的装置之间。

公开(公告)号：US5898580A

公开(公告)日：1999-04-27

申请号：US976571

申请日：1997-11-24

申请人： Kum Yoong Zee

发明人： Kum Yoong Zee

IPC分类号： H04N3/18 ,  H02H3/08 ,  H02H7/12 ,  H02M3/28 ,  H02M3/338 ,  H02M7/10

CPC分类号： H02H7/1213 ,  H02M3/3384

摘要： The invention is about a dc/dc converter (1) fitted with switching means (11, 12) having a drive electrode (13, 14) each drive electrode (13, 14) being connected to polarization means (49,50). The switching means are to switch on and off a current coming from a direct source of current 2 and circulating in windings (17, 18, 5) of transformers (6, 7) of the converter. The improvement according to the invention comprises a protection circuit 24 connected to means (44) for detecting the value of current circulating in one of the windings (4, 5, 15, 19, 23) of the transformers. Outputs (47, 48) of circuit 24 are connected to the drive electrode (13, 14) of switching means (11, 12). Protection circuit (24) may be a bistable circuit that will lower voltage at its outputs (47, 48) in a permanent way if detected current has been to high, thus switching off in a permanent way switching means (11, 12). The switching off is made in less than a working period of the switching means (11, 12) and prevent any damage to said switching means.

摘要翻译： 本发明涉及一种具有开关装置（11,12）的dc / dc转换器（1），其具有驱动电极（13,14），每个驱动电极（13,14）连接到偏振装置（49,50）。 开关装置是接通和断开来自电流2的直流源的电流，并在转换器的变压器（6,7）的绕组（17,18,5）中循环。 根据本发明的改进包括保护电路24，其连接到用于检测在变压器的一个绕组（4,5,15,19,23）中循环的电流值的装置（44）。 电路24的输出端（47,48）与开关装置（11,12）的驱动电极（13,14）相连。 保护电路（24）可以是双稳态电路，其如果检测到的电流已经变为高电平，则以恒定方式降低其输出（47,48）处的电压，从而以永久性方式切换开关装置（11,12）。 在切换装置（11,12）的不到工作周期内进行关闭，并且防止对所述切换装置的任何损坏。

公开(公告)号：US5870476A

公开(公告)日：1999-02-09

申请号：US702353

申请日：1996-08-23

申请人： Jean-Bernard Fischer

发明人： Jean-Bernard Fischer

IPC分类号： G09C1/00 ,  H04L9/20 ,  H04L9/32 ,  H04N7/167 ,  H04L9/00

CPC分类号： H04N7/1675 ,  G06Q20/085 ,  G06Q20/10 ,  G06Q20/401 ,  G06Q40/00 ,  H04L9/0643 ,  H04L9/0662 ,  H04L2209/56

摘要： The process comprises a "pledging" step in which a debtor party transmits to a creditor party a data item which is the image of a pledged data item, and a "commencement" step in which the debtor party transmits the plain pledged data item to the creditor party who can verify pledge consistency. In the pledging step, the debtor party produces a seed applied to a pseudo-random generator to produce a pseudo-random word, combines this pseudo-random word in a one-to-one and reversible manner with the pledged data item to produce a checkword, and transmits the checkword to the creditor party. In the commencement step, the debtor party transmits to the creditor party the seed together with the plain pledged data item. The creditor party then applies the seed to a pseudo-random generator similar to that of the debtor party to produce another pseudo-random word, combines in the same one-to-one and reversible manner as for the debtor party, this other pseudo-random word with the checkword, to produce a check data item, and checks the consistency of the check data item with the plain pledged data item received from the debtor party.

摘要翻译： 该过程包括“承诺”步骤，其中债务方向债权人转交作为质押数据项目的图像的数据项目，以及“开始”步骤，其中债务人将平原质押的数据项目传送到 债权人可以验证抵押一致性。 在认捐步骤中，债务方产生应用于伪随机生成器的种子以产生伪随机字，将该伪随机字与质押数据项以一对一且可逆的方式组合，以产生 并将该备忘录转交给债权人。 在开始步骤中，债务方向该债权人转交种子以及明确的数据项目。 然后，债权人将种子应用于与债务方相似的伪随机生成器，以产生另一个伪随机字，以与债务方相同的一对一可逆方式组合， 随机单词与备注字，以产生检查数据项，并检查检查数据项与从债务方收到的明确质押数据项的一致性。