利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

228 条记录 (耗时 0.012 秒)

    Method and apparatus for delivering simultaneous constant bit rate compressed video streams at arbitrary bit rates with constrained drift and jitter
    111.
    发明公开
    Method and apparatus for delivering simultaneous constant bit rate compressed video streams at arbitrary bit rates with constrained drift and jitter 失效
    方法和生成装置，具有同时恒定比特率，数据序列具有降低的漂移和震颤可变比特率压缩的视频数据的序列的基础上

    公开(公告)号：EP0779725A2

    公开(公告)日：1997-06-18

    申请号：EP96308503.0

    申请日：1996-11-25

    申请人： SUN MICROSYSTEMS, INC.

    发明人： Mandal, Kallol ,  Kleiman, Steven

    IPC分类号： H04L12/56 ,  H04J3/06

    CPC分类号： H04L65/4076 ,  H04L29/06 ,  H04L29/06027 ,  H04L65/80 ,  H04N7/17336 ,  H04N21/2143 ,  H04N21/23406 ,  H04N21/2402 ,  H04N21/242 ,  H04N21/26208 ,  H04N21/47202 ,  H04N21/64307

    摘要： A video server is taught which is capable of outputting a plurality of video streams simultaneously. Each video stream is synchronized at two levels of synchronization: coarse-grain and fine-grain. The coarse-grain synchronization is carried out in software over a plurality of packets of data, and the fine-grain synchronization carried out using the network clock. By utilizing both coarse-grain and fine-grain synchronization as taught by this invention, drift and jitter are controlled, providing accurate presentation of constant bit rate data to a receiving device. As another feature of this invention, a bit pump is utilized which includes header information such as constant bit rate information, and information regarding the rates associated with the coarse-grain and fine-grain synchronization. By utilizing this preinitialized header information, CPU demands are reduced as compared with prior art systems in which the CPU must look up timing information from the data to be transmitted.

    摘要翻译： 一种视频服务器中教导的所有其能够输出婷视频的多元性同时流。 粗粒度和细粒：每个视频流在同步的两个级别同步。 粗晶粒同步是在软件上的数据分组的多元性进行，和细粒度的同步进行了使用网络时钟。 通过利用所教导由本发明中，漂移和抖动两个粗粒度和细粒同步被控制，向接收设备提供恒定比特率的数据的准确的呈现。 作为本发明的另一个特征，一个位泵利用其中包含报头信息：诸如恒定比特率的信息，以及关于与所述粗颗粒和细颗粒的同步相关联的速率。 通过利用该预初始化的报头信息，CPU需求被减少，与现有技术的系统，其中CPU必须从数据查找定时信息是反式mitted相比。

    An apparatus and method for packetizing and segmenting MPEG packets
    114.
    发明公开
    An apparatus and method for packetizing and segmenting MPEG packets 失效
    Anlage und Verfahren zur Paketierung und Segmentierung von MPEG-Paketen

    公开(公告)号：EP0752802A2

    公开(公告)日：1997-01-08

    申请号：EP96110991.5

    申请日：1996-07-08

    申请人： SUN MICROSYSTEMS, INC.

    发明人： Gaytan, Andre J. ,  Gentry, Denton E., Jr. ,  Oskouy, Rasoul M.

    IPC分类号： H04Q11/04

    CPC分类号： H04N21/2381 ,  H04L2012/5616 ,  H04L2012/5652 ,  H04N21/64307 ,  H04Q11/0478

    摘要： A circuit and method for optimizing efficiency in transferring a block of data having a plurality of frames of limited size from a memory element. The circuit comprises a transmit ("TX") DMA engine and a TX Segmentation engine. The TX DMA engine is responsible for accessing overhead information for the block of data within a TX data buffer from a data descriptor dedicated to that particular TX data buffer. The TX DMA engine is further responsible for reading the block of data from the memory element to be stored local thereto. The TX Segmentation engine is responsible for segmenting the block of data into a plurality of cell packets corresponding in number to the plurality of frames. Each cell packet contains in common said overhead information for the block of data to avoid the TX DMA engine reaccessing the data descriptor to obtain the same overhead information for each frame being transferred.

    摘要翻译： 一种用于优化从存储元件传送具有有限尺寸的多个帧的数据块的效率的电路和方法。 该电路包括发送（“TX”）DMA引擎和TX分段引擎。 TX DMA引擎负责从专用于该特定TX数据缓冲器的数据描述符访问TX数据缓冲器内的数据块的开销信息。 TX DMA引擎还负责从本地存储的存储器元件读取数据块。 TX分段引擎负责将数据块分割成与多个帧相对应的多个信元分组。 每个单元包共同地包含用于数据块的所述开销信息，以避免TX DMA引擎重新访问数据描述符，以便为每个被传送的帧获得相同的开销信息。

    Configurable hybrid medium access control for cable metropolitan area networks
    116.
    发明公开
    Configurable hybrid medium access control for cable metropolitan area networks 失效
    大都会Kabelnetzwerken的Zugangskontrollefürein konfigurierbares Hybridmedium

    公开(公告)号：EP0730382A2

    公开(公告)日：1996-09-04

    申请号：EP96301369.3

    申请日：1996-02-28

    申请人： GENERAL INSTRUMENT CORPORATION

    发明人： Safadi, Reem

    IPC分类号： H04N7/173

    CPC分类号： H04N21/6118 ,  H04J3/1694 ,  H04L12/2801 ,  H04L67/34 ,  H04L2012/5605 ,  H04L2012/5606 ,  H04L2012/561 ,  H04L2012/5642 ,  H04L2012/5667 ,  H04N7/17309 ,  H04N7/22 ,  H04N21/2221 ,  H04N21/2381 ,  H04N21/2665 ,  H04N21/4381 ,  H04N21/6168 ,  H04N21/64307 ,  H04Q11/0478

    摘要： The hybrid medium access control (MAC) system is configurable to the type of communication required to support a desired application or service. The MAC system analyzes services requested from a settop terminal, or a network controller client, and determines the best MAC component for transmitting signals upstream based on the resources required by the service and the available network resources. A portion of the upstream channel spectrum is allocated to each of the MAC components: 1) POP; 2) assigned static TDMA; 3) assigned dynamic multi-rate TDMA; and 4) random slot reservation - dynamic slot allocation TDMA. Depending upon the communication requirements of the service desired, the configurable MAC system will select the MAC component best suited to support the service. A frequency agile transmitter is then tuned to the channel which has been preallocated for the selected MAC component(s). As communication traffic varies over time, the system reallocates portions of the upstream channel spectrum among the different MAC components and may also reconfigure a specific MAC component.

    摘要翻译： 混合介质访问控制（MAC）系统可配置为支持所需应用或服务所需的通信类型。 MAC系统分析从机顶终端或网络控制器客户端请求的服务，并根据服务所需的资源和可用的网络资源确定用于向上游发送信号的最佳MAC组件。 上游信道频谱的一部分被分配给每个MAC组件：1）POP; 2）分配静态TDMA; 3）分配动态多速率TDMA; 和4）随机时隙预留 - 动态时隙分配TDMA。 根据所需服务的通信要求，可配置的MAC系统将选择最适合于支持服务的MAC组件。 然后将频率敏捷发射机调谐到已经为所选MAC组件预先分配的信道。 随着通信流量随时间而变化，系统重新分配不同MAC组件之间的上行信道频谱的部分，并且还可以重新配置特定的MAC组件。

    Television signal and ATM cell switching system
    117.
    发明授权
    Television signal and ATM cell switching system 失效
    电视信号和ATM信元交换系统

    公开(公告)号：EP0513763B1

    公开(公告)日：1996-09-04

    申请号：EP92108080.0

    申请日：1992-05-13

    申请人： FUJITSU LIMITED

    发明人： Hiroshi, Miyake, c/o Fujitsu Limited ,  Yasuhiro, Aso, c/o Fujitsu Limited

    IPC分类号： H04N7/173 ,  H04N7/32

    CPC分类号： H04N21/23608 ,  H04L49/3081 ,  H04L2012/561 ,  H04L2012/5612 ,  H04L2012/5615 ,  H04L2012/5672 ,  H04N7/17354 ,  H04N21/2221 ,  H04N21/6373 ,  H04N21/64307 ,  H04Q11/0478

    摘要： A television signal and ATM cell switching system for switching ATM cells of data other than television signals and for supplying one channel among a plurality of channels of television signals transmitted from a source to a subscriber to carry out one-way communication of the television signals from the source to the subscribers and two-way communication of the data other than the television signals between the network and the subscribers comprising, a television signal transmitting means (4) for transmitting television signals in the form of ATM cells, an ATM switching means (3) for switching ATM cell data other than the television signals, a television signal cell inserting circuit (1) for receiving a plurality of channels of the television signals from the television signal transmitting means (4), and for receiving the ATM cell data other than the television signals after being switched by the ATM switching means (3), the television signal inserting circuit (1) comprising, a demultiplexing circuit (10) for demultiplexing the output of the ATM switching means (3) to provide a plurality of outputs corresponding to respective subscribers, and a plurality of multiplexing circuits (11) each for multiplexing the demultiplexed ATM cell received from one corresponding output of the demultiplexing circuit (10) and one channel of the ATM cells selected in accordance with a request from the corresponding subscriber.

    Television signal and ATM cell switching system
    120.
    发明公开
    Television signal and ATM cell switching system 失效
    电视信号和ATM信元交换系统

    公开(公告)号：EP0513763A3

    公开(公告)日：1993-03-03

    申请号：EP92108080.0

    申请日：1992-05-13

    申请人： FUJITSU LIMITED

    发明人： Hiroshi, Miyake, c/o Fujitsu Limited ,  Yasuhiro, Aso, c/o Fujitsu Limited

    IPC分类号： H04N7/173 ,  H04N7/32

    CPC分类号： H04N21/23608 ,  H04L49/3081 ,  H04L2012/561 ,  H04L2012/5612 ,  H04L2012/5615 ,  H04L2012/5672 ,  H04N7/17354 ,  H04N21/2221 ,  H04N21/6373 ,  H04N21/64307 ,  H04Q11/0478

    摘要： A television signal and ATM cell switching system for switching ATM cells of data other than television signals and for supplying one channel among a plurality of channels of television signals transmitted from a source to a subscriber to carry out one-way communication of the television signals from the source to the subscribers and two-way communication of the data other than the television signals between the network and the subscribers comprising, a television signal transmitting means (4) for transmitting television signals in the form of ATM cells, an ATM switching means (3) for switching ATM cell data other than the television signals, a television signal cell inserting circuit (1) for receiving a plurality of channels of the television signals from the television signal transmitting means (4), and for receiving the ATM cell data other than the television signals after being switched by the ATM switching means (3), the television signal inserting circuit (1) comprising, a demultiplexing circuit (10) for demultiplexing the output of the ATM switching means (3) to provide a plurality of outputs corresponding to respective subscribers, and a plurality of multiplexing circuits (11) each for multiplexing the demultiplexed ATM cell received from one corresponding output of the demultiplexing circuit (10) and one channel of the ATM cells selected in accordance with a request from the corresponding subscriber.