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公开(公告)号：EP0322026A3
公开(公告)日：1989-09-27
申请号：EP88202852.5
申请日：1988-12-13
IPC分类号： H04J3/16
CPC分类号： H04J3/247
摘要： Conditional multiplexer wherein an input bitstream having a variable bitrate is allowed as part of a multiplexed output bitstream of input bitstreams or not depending on the result of an operation performed by processing means (TPR1) and which consists in calculating an estimated output bandwidth (B2) of said output bitstream from the mean values (mi) and variances (vi) of the probability distribution functions of the bitrates of said input bitstreams and in the subsequent comparison of said estimated output bandwidth (B2) with the maximum allowable output bandwidth (B). Further processing means (RPR1) continuously measure the mean and variance parameters and continuously verify if the sources of the bitstreams operate within the assigned bandwidths.
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公开(公告)号：EP0322026A2
公开(公告)日：1989-06-28
申请号：EP88202852.5
申请日：1988-12-13
IPC分类号： H04J3/16
CPC分类号： H04J3/247
摘要： Conditional multiplexer wherein an input bitstream having a variable bitrate is allowed as part of a multiplexed output bitstream of input bitstreams or not depending on the result of an operation performed by processing means (TPR1) and which consists in calculating an estimated output bandwidth (B2) of said output bitstream from the mean values (mi) and variances (vi) of the probability distribution functions of the bitrates of said input bitstreams and in the subsequent comparison of said estimated output bandwidth (B2) with the maximum allowable output bandwidth (B). Further processing means (RPR1) continuously measure the mean and variance parameters and continuously verify if the sources of the bitstreams operate within the assigned bandwidths.
摘要翻译： 条件多路复用器，其中根据由处理装置（TPR1）执行的操作的结果，允许具有可变比特率的输入比特流作为输入比特流的多路复用输出比特流的一部分，并且包括计算估计的输出带宽（B2） 根据所述输入比特流的比特率的概率分布函数的平均值（mi）和方差（vi）以及随后的所述估计输出带宽（B2）与最大允许输出带宽（B）的比较， 。 进一步的处理装置（RPR1）连续地测量平均值和方差参数，并连续验证比特流的源是否在分配的带宽内运行。
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公开(公告)号：EP0275129B1
公开(公告)日：1994-04-06
申请号：EP88200011.0
申请日：1988-01-07
CPC分类号： H04L1/02 , H04N11/042 , H04N19/186 , H04N19/40 , H04N19/63
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公开(公告)号：EP0275129A3
公开(公告)日：1989-07-26
申请号：EP88200011.0
申请日：1988-01-07
CPC分类号： H04L1/02 , H04N11/042 , H04N19/186 , H04N19/40 , H04N19/63
摘要： Information transmission system wherein information signals (Y1, C1; Y2, C2; Y3, C3) relating to a same video image and defining this image with a different accuracy are transmitted in an asynchronous way and on a time division basis under the form of packet sets (Y1, C1; Y21, C21; Y32, C32). In a receiving station (SS2) the information signals are derived from the received packet sets and by means of selection circuit (SEC1/3) two or more of these signals are supplied to a combination device (VTE) and are combined therein to form an image.
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公开(公告)号：EP0275129A2
公开(公告)日：1988-07-20
申请号：EP88200011.0
申请日：1988-01-07
CPC分类号： H04L1/02 , H04N11/042 , H04N19/186 , H04N19/40 , H04N19/63
摘要： Information transmission system wherein information signals (Y1, C1; Y2, C2; Y3, C3) relating to a same video image and defining this image with a different accuracy are transmitted in an asynchronous way and on a time division basis under the form of packet sets (Y1, C1; Y21, C21; Y32, C32). In a receiving station (SS2) the information signals are derived from the received packet sets and by means of selection circuit (SEC1/3) two or more of these signals are supplied to a combination device (VTE) and are combined therein to form an image.
摘要翻译： 信息传输系统，其中以相同视频图像定义与定义不同精度的图像的信息信号（Y1，C1; Y2，C2; Y3，C3）以异步方式并且以分组的形式以分组的形式被发送 （Y1，C1; Y21，C21; Y32，C32）。 在接收站（SS2）中，信息信号从接收到的分组集合中导出，并且通过选择电路（SEC1 / 3）将这些信号中的两个或更多个提供给组合设备（VTE），并将其组合在一起 图片。
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公开(公告)号：EP0625856A1
公开(公告)日：1994-11-23
申请号：EP93870084.6
申请日：1993-05-19
发明人： Verbiest, Willem Jules Antoine , Voeten, Bart Frans , Vermeulen, Christophe Daniel Ghislain , Van Der Putten, Frank Octaaf , Defoort, Frank Cyriel Michel
IPC分类号： H04N7/173
CPC分类号： H04N21/2747 , H04N7/17336 , H04N7/17354
摘要： A video on demand network (VODN) is proposed which transmits video signals (VS) to user stations (US11, .., US2N) pursuant to the receipt of control signals (CS) issued by these user stations.
In order to optimize the retrieval costs, this video on demand network maintains a large video library in a central video server (CS) and stores locally popular video signals in a plurality of local distributed video servers (DS1/2) from which the latter video signals are transmitted to the user stations. The video signals provided by the local distributed servers are updated from the central server based upon the changing popularity of the video signals.
The present invention proposes in particular to store the video signals in the local distributed servers in random access read/write memories (HDA), e.g. electronic RAMs and magnetic or optical disks, from which the video signals can flexibly be supplied on-line to the user stations and to store the video signals in the central server in sequential access memories, e.g. Digital Audio Tapes (DAT) and CD-ROMs (CDR), providing cheap mass storage.摘要翻译： 提出了一种视频点播网络（VODN），其根据由这些用户站发出的控制信号（CS）的接收，向用户站（US11，...，US2N）发送视频信号（VS）。 为了优化检索成本，该视频点播网络在中央视频服务器（CS）中维护大型视频库，并将本地流行的视频信号存储在多个本地分布式视频服务器（DS1 / 2）中，后者的视频 信号被发送到用户站。 基于视频信号的变化的流行度，由中央服务器更新本地分布式服务器提供的视频信号。 本发明特别提出将视频信号存储在随机存取读/写存储器（HDA）中的本地分布式服务器中。 电子RAM和磁盘或光盘，视频信号可以从其中灵活地在线提供给用户站，并将视频信号存储在中央服务器中，例如连续访问存储器中。 数字音频磁带（DAT）和CD-ROM（CDR），提供便宜的大容量存储。
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公开(公告)号：EP0548409A1
公开(公告)日：1993-06-30
申请号：EP91203369.3
申请日：1991-12-23
发明人： Van de Voorde, Ingrid Zulma Benoit , Mestdagh, Denis Julien Gilles , Van der Plas, Gert , Sierens, Christiaan Hendrik Jozef , Verbiest, Willem Jules Antoine
IPC分类号： H04B10/24
CPC分类号： H04B10/2503
摘要： The system includes two transmitters (T1, T2) and two receivers (R1, R2). One transmitter (T1) includes a wavelength tunable laser, sending an FSK optical signal (OS1) which has a constant intensity. In a first receiver (R1) this FSK optical signal (OS1) is transformed into an IM signal (OS1') by an optical pass band filter. This IM signal (OS1') is then detected by a first direct detection receiver (DM). In a second direct detection receiver (R2) the FSK optical signal (OS2) is not detected, since it has constant intensity. A second transmitter (T2) includes a Fabry Perot laser or a LED with a broad linewidth, sending an IM optical signal (OS2). This IM optical signal (OS2) is detected by the second direct detection receiver (R2). It is not detected by the first direct detection receiver (DM), because it is strongly attenuated when passing through the narrow bandpass optical filter (TM) before being applied to the first direct detection receiver. This system is especially advantageous in bidirectional optical transmission systems, due to its inherent insensitivity for reflections.
摘要翻译： 该系统包括两个发射器（T1，T2）和两个接收器（R1，R2）。 一个发射器（T1）包括波长可调激光器，发送具有恒定强度的FSK光信号（OS1）。 在第一个接收器（R1）中，这个FSK光信号（OS1）被一个光学通带滤波器转换成一个IM信号（OS1'）。 该IM信号（OS1'）然后由第一直接检测接收器（DM）检测。 在第二个直接检测接收器（R2）中，由于FSK光信号（OS2）具有恒定的强度，所以不检测FSK光信号（OS2）。 第二发射器（T2）包括法布里珀罗激光器或具有宽线宽的LED，发送IM光信号（OS2）。 该IM光信号（OS2）由第二直接检测接收器（R2）检测。 它不被第一直接检测接收机（DM）检测到，因为它在被施加到第一直接检测接收机之前在通过窄带通滤光器（TM）时被强烈衰减。 由于其对反射的固有不敏感性，该系统在双向光传输系统中特别有利。
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公开(公告)号：EP0544975A1
公开(公告)日：1993-06-09
申请号：EP91870197.0
申请日：1991-12-05
发明人： van der Plas, Gert , Verbiest, Willem Jules Antoine , Mestdagh, Denis Julien Gilles , Sierens, Christiaan Hendrik Jozef
IPC分类号： H04Q11/04
CPC分类号： H04J3/1694 , H04L2012/561 , H04L2012/5632 , H04Q11/0478
摘要： The time slot management system is included in a digital time division multiple access system comprising a main station MS and a plurlity of substations U1/16 connected to each other by means of a tree network. The substations U1/16 send to the main station MS upstream information packet in time slots assigned to each of the former stations by the latter one. Part of the time slots is reserved for management information and used by the substation to inform the main station about the bandwidth needed for the further transfer of the upstream information. According to this information the time slot management system allocates the time slots and informs the substations thereof. In this way a flexible and dynamical time slot allocation is provided.
摘要翻译： 时隙管理系统包括在数字时分多址系统中，该数字时分多址系统包括通过树网络彼此连接的主站MS和多个变电站U1 / 16。 变电站U1 / 16发送到主站MS上游信息包，后者由分配给前者的每个站的时隙发送。 部分时隙被保留用于管理信息，并由变电站使用，通知主站关于进一步传送上游信息所需的带宽。 根据该信息，时隙管理系统分配时隙并通知其变电站。 以这种方式提供灵活和动态的时隙分配。
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公开(公告)号：EP0529154A1
公开(公告)日：1993-03-03
申请号：EP91202188.8
申请日：1991-08-28
CPC分类号： H04L12/5602 , H04L2012/5616 , H04L2012/5636
摘要： Encoder arrangement including the cascade connection of a data source (VSS), an encoder circuit (ENC) and a buffer circuit (BUFC) which is part of a preventive policing circuit (PPC) adapted to reduce the data output rate of said buffer circuit when said output rate does not satisfy a predetermined probability distribution function CCCP/CR) of said output rate . The PPC at the end of each measurement interval measures this data output rate, determins the interval (BRI) to which the measured data output rate belongs and generates an alarm signal (AL). Via a gating arrangement (AG, GC) the alarm signal controls the connection of a clock signal (CL0/3) with a reduced output rate to the read-out input (RO) of the buffer circuit (BUFC) when for the measured interval the cell rate has to be decreased.
摘要翻译： 编码器装置包括数据源（VSS），编码器电路（ENC）和缓冲电路（BUFC）的级联连接，该电路是作为预防性监管电路（PPC）的一部分的缓冲器电路（BUFC），适用于在减少所述缓冲电路的数据输出速率时 所述输出速率不满足所述输出速率的预定概率分布函数CCCP / CR）。 每个测量间隔结束时的PPC测量此数据输出速率，确定测量数据输出速率所属的间隔（BRI），并产生报警信号（AL）。 通过选通装置（AG，GC），当对于测量间隔时，报警信号控制具有降低的输出速率的时钟信号（CL0 / 3）与缓冲电路（BUFC）的读出输入（RO）的连接 细胞速率必须降低。
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