公开(公告)号：US20040030665A1

公开(公告)日：2004-02-12

申请号：US10418735

申请日：2003-04-18

发明人： Gary J. Sullivan

IPC分类号： G06N005/02

CPC分类号： H04N19/00 ,  H04J3/0605 ,  H04N19/70 ,  H04N19/89

摘要： Methods and systems provide approaches to start code emulation prevention at a granularity higher than the bit level. In various embodiments, start code emulation prevention can occur at locations other than data boundaries such as byte boundaries and the like. These embodiments can be used in connection with systems that do not always preserve data alignment boundaries in the data that is processed. In some systems, the described techniques can provide a basis from which decoder systems can recover in the event that data boundaries are lost.

摘要翻译： 方法和系统提供了高于位级别的粒度启动代码仿真预防的方法。 在各种实施例中，起始码仿真防止可以发生在数据边界以外的位置，例如字节边界等。 这些实施例可以与不总是保留所处理的数据中的数据对齐边界的系统结合使用。 在一些系统中，所描述的技术可以提供在数据边界丢失的情况下从哪个解码器系统可以恢复的基础。

公开(公告)号：US20040003109A1

公开(公告)日：2004-01-01

申请号：US10180741

申请日：2002-06-26

发明人： David J. Knapp ,  Horace C. Ho

IPC分类号： G06F015/16

CPC分类号： H04L65/607 ,  H04J3/0605

摘要： A communication system, network interface, and communication port is provided for interconnecting a network of multimedia devices. The multimedia devices can send streaming and/or non-streaming data across the network. The network accommodates all such types of data and assigns data types to time slots or frame segments within each frame to ensure streaming data maintains its temporal relationship at the receiver consistent with the transmitter. A coding violation within a frame segment of one or more frames is used to indicate the absence of isochronous streaming data within the byte locations containing the coding violations. Coding violations can, therefore, be interspersed between isochronous data messages or data transfers to note that a particular portion of a frame segment does not contain isochronous data.

摘要翻译： 提供通信系统，网络接口和通信端口用于互连多媒体设备的网络。 多媒体设备可以通过网络发送流和/或非流数据。 网络容纳所有这些类型的数据，并将数据类型分配给每帧内的时隙或帧段，以确保流数据在接收机处保持其与发射机一致的时间关系。 一个或多个帧的帧段内的编码违例用于指示在包含编码违例的字节位置内不存在同步流数据。 因此，编码冲突可以穿插在同步数据消息或数据传输之间，以注意到帧段的特定部分不包含同步数据。

公开(公告)号：US20030223401A1

公开(公告)日：2003-12-04

申请号：US10438811

申请日：2003-05-16

申请人： ALCATEL

发明人： Wolfram Lautenschlager ,  Stefan Schabel ,  Stephan Bunse

IPC分类号： H04L012/28

CPC分类号： H04J3/0605 ,  H04J2203/0089 ,  H04L7/046

摘要： A method for the asynchronous transmission of data packets in telecommunication networks with a bit rate B is characterized by methoding of the data to be transmitted such that the probability of the occurrence of a 0 or 1 state in the data stream at each bit position is approximately equal and independent of other bit positions (nullscrambling); waiting for a guard band time tgb, transmission of a synchronization sequence during time tsy, transmission of a synchronization word during time tco, and transmission of the data payload; detection of a synchronization sequence and synchronization to this in a receiver; detection of the start of the data packet by detection of the synchronization word in the receiver; reception of the data payload in the receiver.

摘要翻译： 用于以比特率B的电信网络中的数据分组的异步传输的方法的特征在于要发送的数据的方法，使得在每个比特位置的数据流中出现0或1状态的概率近似 等于和独立于其他位位置（=加扰）; 等待保护频段时间tgb，在时间tsy期间传输同步序列，在时间tco期间发送同步字，并传输数据有效载荷; 在接收机中检测同步序列并与其同步; 通过检测接收机中的同步字来检测数据包的开始; 在接收机中接收数据有效载荷。

公开(公告)号：US20030146855A1

公开(公告)日：2003-08-07

申请号：US10350273

申请日：2003-01-22

发明人： Gary J. Sullivan ,  Stephen J. Estrop

IPC分类号： H03M001/22

CPC分类号： H04N21/23424 ,  H04J3/0605 ,  H04J3/07 ,  H04N19/184 ,  H04N19/70 ,  H04N19/91 ,  H04N21/2343 ,  H04N21/44016 ,  H04N21/8455

摘要： Methods and systems provide approaches to start code emulation prevention at a granularity higher than the bit level. By operating at a level other than the bit level, processing capability requirements on both the encoder and decoder side can be reduced. In accordance with one or more embodiments, a start code emulation prevention method looks for data patterns relative to fixed-size data portions larger than single bits. When a particular pattern is found, start code emulation prevention data is inserted to prevent start code emulation. The inserted data is larger than a single bit and, in some embodiments, comprises a byte. When a decoder decodes data that has had start code emulation prevention data inserted, it can easily identify legitimate start codes and then can remove the start code emulation prevention data to provide the original data that was protected. In addition, a data stuffing method is described which allows payload data to be rounded up in size to an integer number of byte sizes, and then allows filler data to be added in a manner which is easily detectable by a decoder.

公开(公告)号：US06535505B1

公开(公告)日：2003-03-18

申请号：US09164079

申请日：1998-09-30

申请人： Cherng-Daw Hwang ,  Kenley Wong

发明人： Cherng-Daw Hwang ,  Kenley Wong

IPC分类号： H04J1266

CPC分类号： H04J3/1682 ,  H04J3/0605

摘要： A Multiservice Access Concentrator (MAC) is provided at which a dynamic association is established and maintained among a number of processors and a number of voice channels of a data stream. The voice channels are multiplexed voice channels received in a Pulse Code Modulation (PCM) data stream. The processors comprise digital signal processors (DSPs) for performing compression and decompression of the plurality of voice channels. A table is generated that tracks the association among the plurality of processors and the plurality of voice channels. At least one signal is generated that synchronizes a transfer of data among each of the processors and the associated voice channels. The generation of at least one signal comprises providing a frame synchronization signal to each of the processors to indicate the start of a first voice channel. Furthermore, a byte synchronization signal is provided to each processor when the associated voice channel is available for transfer. Moreover, a clock gating control signal is provided to each of the processors when the associated voice channel is available for transfer. A number of compressed voice channels are provided to at least one multi-service network using a configurable trunk, wherein the at least one multi-service network comprises Asynchronous Transfer Mode (ATM), Frame Relay, High-level Data Link Control (HDLC), Internet Protocol (IP), and TDM networks.

摘要翻译： 提供了多业务接入集中器（MAC），在多业务接入集中器（MAC）中，在多个处理器和数据流的多个语音信道之间建立和维护动态关联。 语音信道是在脉冲编码调制（PCM）数据流中接收的复用语音信道。 处理器包括用于执行多个语音信道的压缩和解压缩的数字信号处理器（DSP）。 生成跟踪多个处理器和多个语音信道之间的关联的表。 生成至少一个信号，其同步每个处理器和相关联的语音信道之间的数据传送。 产生至少一个信号包括向每个处理器提供帧同步信号以指示第一语音信道的开始。 此外，当相关联的语音信道可用于传送时，字节同步信号被提供给每个处理器。 此外，当相关联的语音信道可用于传送时，时钟门控控制信号被提供给每个处理器。 多个压缩语音信道被提供给使用可配置中继线的至少一个多业务网络，其中所述至少一个多业务网络包括异步传输模式（ATM），帧中继，高级数据链路控制（HDLC） ，互联网协议（IP）和TDM网络。

公开(公告)号：US06529528B1

公开(公告)日：2003-03-04

申请号：US08884630

申请日：1997-06-27

申请人： Dong-seek Park ,  John Villasenor

发明人： Dong-seek Park ,  John Villasenor

IPC分类号： G06F1516

CPC分类号： H04L65/607 ,  H04J3/0605 ,  H04J3/0611 ,  H04L7/041 ,  H04L29/06 ,  H04L29/06027 ,  H04L65/1009 ,  H04L69/324 ,  H04N7/52 ,  H04N19/89 ,  H04N21/2383 ,  H04N21/4382

摘要： A multiplexing method for multimedia communication is provided, which is compatible with the H.223 protocol by changing a header of a multiplex protocol data unit (MUX-PDU). The multiplexing method includes the steps of encoding media data, and multiplexing the media data encoded in the step (a) in units of a predetermined frame, and inserting a second flag having a predetermined length with an auto-correlation into the frame after a first flag representing the opening and closing of the frame. Therefore, the probability of detecting the MUX-PDU by a receiver is increased by adding a flag having a high auto-correlation to the H.223 MUX-PDU frame, thereby increasing error-resiliency.

摘要翻译： 提供了一种多媒体通信的复用方法，其通过改变多路复用协议数据单元（MUX-PDU）的报头与H.223协议兼容。 复用方法包括以下步骤：对媒体数据进行编码，并以步骤（a）中编码的媒体数据以预定的帧为单位进行多路复用，并且在第一个帧之后，将具有自相关的预定长度的第二标记插入到帧中 标志代表框架的开启和关闭。 因此，通过向H.223 MUX-PDU帧添加具有高自相关的标志来增加接收机检测MUX-PDU的概率，从而增加错误弹性。

公开(公告)号：US06516199B1

公开(公告)日：2003-02-04

申请号：US08996478

申请日：1997-12-22

申请人： Jan Erik Söderkvist ,  Lars Peter Wahlström

发明人： Jan Erik Söderkvist ,  Lars Peter Wahlström

IPC分类号： H04B701

CPC分类号： H04B7/2693 ,  H04J3/0605

摘要： A cellular network is controlled such that time slots of transmissions from base stations with the same operating frequency are synchronized. Moreover, adjacent base stations using the same frequency are controlled such that, at any given time, they are transmitting different sync words.

摘要翻译： 控制蜂窝网络，使得具有相同工作频率的基站的传输时隙同步。 此外，使用相同频率的相邻基站被控制，使得在任何给定时间，它们正在发送不同的同步字。

公开(公告)号：US06515976B1

公开(公告)日：2003-02-04

申请号：US09055491

申请日：1998-04-06

申请人： Paul W. Dent ,  Santanu Dutta

发明人： Paul W. Dent ,  Santanu Dutta

IPC分类号： H04J300

CPC分类号： H04B7/2125 ,  H04J3/0605 ,  H04L7/0004 ,  H04L2007/047

摘要： A method and apparatus for demodulating a communication signal transmitted at a first rate is provided, wherein the communication signal includes a plurality of addresses and corresponding data packets. The demodulating method includes the steps of receiving the communication signal at a user terminal, identifying which of the plurality of data packets are destined to the receiving user terminal, and demodulating, at a second rate less than the first rate, only the data packets identified as being destined to the receiving user terminal.

摘要翻译： 提供一种用于解调以第一速率发送的通信信号的方法和装置，其中通信信号包括多个地址和对应的数据分组。 解调方法包括以下步骤：在用户终端处接收通信信号，识别多个数据分组中的哪个数据分组去往接收用户终端，并以小于第一速率的第二速率解调仅标识的数据分组 作为注定到接收用户终端。

公开(公告)号：US20020191640A1

公开(公告)日：2002-12-19

申请号：US10153321

申请日：2002-05-22

申请人： International Business Machines Corporation

发明人： Charles Louis Haymes ,  Mark B. Ritter ,  Thomas Rower

IPC分类号： H04J003/16 ,  H04J003/24

CPC分类号： H04J3/0605 ,  H04J3/0602 ,  H04J2203/0089 ,  H04L69/18 ,  H04L69/24 ,  H04L69/324

摘要： A data framer capable of supporting at least two different data framing protocols potentially present in a source data stream includes two or more framing circuits and a controller coupled to the framing circuits. Each of the framing circuits is configured to extract user data from the source data stream in accordance with a different data framing protocol associated with the respective framing circuit. The controller is operative to: (i) receive the source data stream and automatically determine which of the at least two different data framing protocols corresponds to the source data stream; and (ii) route the source data stream to one of the first framing circuit and the second framing circuit in response to a match between the determined data framing protocol of the source data stream and one of the first and second data framing protocols.

摘要翻译： 能够支持可能存在于源数据流中的至少两个不同数据成帧协议的数据成帧器包括两个或更多个成帧电路和耦合到成帧电路的控制器。 每个成帧电路被配置为根据与各个成帧电路相关联的不同数据成帧协议从源数据流中提取用户数据。 控制器可操作以：（i）接收源数据流并自动确定至少两个不同数据成帧协议中的哪一个对应于源数据流; 以及（ii）响应于所确定的源数据流的数据成帧协议与第一和第二数据成帧协议之一之间的匹配，将源数据流路由到第一成帧电路和第二成帧电路中的一个。

公开(公告)号：US20020141434A1

公开(公告)日：2002-10-03

申请号：US09817054

申请日：2001-03-27

发明人： Jeffrey Paul Grundvig ,  Yun Xiang Yuan

IPC分类号： H04J003/00

CPC分类号： H04J3/0605 ,  H04J3/06 ,  H04L7/0337 ,  H04L7/10

摘要： The portion of TDMA frames otherwise containing the sync word is eliminated for one or more data frames at the end of a TDMA data burst to provided added bandwidth for data payload or for a reduced bandwidth. Once a communication channel has been established and is in steady state mode (after receipt of one or more frames), the sync word is eliminated from the remaining frame structure. Drift of a local clock with respect to an incoming data stream is monitored using an oversampled or multiplied master clock to provide suitable resolution to determine an approximate position of an active edge of the master clock with respect to a bit or symbol being clocked. Any drift from center results in an adjustment of the local master clock. In a preferred embodiment, the drift is measured in a last bit or symbol of a received TDMA burst, and the master clock is adjusted to re-center the local master clock with respect to that last bit. Accordingly, the receiver is nulltunednull to the clock signal of the transmitting TDMA device such that the receiving TDMA device can predict where the next start of frame will occur. By doing so, the sync word is no longer necessary in the remaining frames of the TDMA burst to decode the start of next TDMA frame. The sync word may be included in more than one frames in the beginning of the TDMA burst, but is eliminated from one or more frames at the end of the TDMA burst.

摘要翻译： 在TDMA数据突发结束时，对于一个或多个数据帧，消除了否则包含同步字的TDMA帧的部分，以提供用于数据有效载荷或减小的带宽的附加带宽。 一旦通信信道已经建立并且处于稳态模式（在接收到一个或多个帧之后），则从剩余的帧结构中消除同步字。 使用过采样或倍增的主时钟监视本地时钟相对于输入数据流的漂移，以提供合适的分辨率来确定主时钟相对于被计时的位或符号的有效边沿的近似位置。 来自中心的漂移导致本地主时钟的调整。 在优选实施例中，在接收到的TDMA脉冲串的最后一位或符号中测量漂移，并调整主时钟以使本地主时钟相对于最后一位重新集中。 因此，接收机被“调谐”为发送TDMA设备的时钟信号，使得接收TDMA设备可以预测帧的下一个起始点将在哪里发生，通过这样做，同步字不再需要在剩余帧中 TDMA突发以解码下一个TDMA帧的开始，同步字可以包括在TDMA突发的开头的多于一个帧中，但在TDMA突发结束的一个或多个帧中被消除。