-
公开(公告)号：US06728924B1
公开(公告)日：2004-04-27
申请号：US09425143
申请日：1999-10-21
IPC分类号： H03M1300
CPC分类号： H04L1/08
摘要： A method for providing packet loss recovery in a data packet-based network used for real-time multimedia communications. In accordance with a first illustrative embodiment of the present invention, the information payload associated with a given data packet k is identically copied and appended to data packet k+w (i.e., the information payload is repeated with a delay of w transmitted packets). More generally, the present invention provides a method of coding a sequence of data packets representing a contiguous stream of information, with each data packet comprising, a set of payload information representative of a segment of the stream of information corresponding thereto. The method comprises the steps of coding a first data packet for transmission (wherein the encoded first data packet comprises a first set of payload information representative of a first segment of the stream of information), and coding a second data packet subsequence to the first data packet in the sequence for transmission (wherein the encoded second data packet comprises a second set of payload information representative of a second segment of the stream of information subsequent to the first segment of the stream of information). The encoded second data packet further comprises an additional set of payload information, the additional set of payload information also representative of the first segment of the stream of information, but not representative of other segments of the stream of information.
摘要翻译： 一种用于在用于实时多媒体通信的基于数据分组的网络中提供分组丢失恢复的方法。 根据本发明的第一示例性实施例，与给定数据分组k相关联的信息有效载荷被相同地复制并附加到数据分组k + w（即，信息有效载荷以w发送的分组的延迟重复）。 更一般地，本发明提供了一种对表示连续的信息流的数据分组序列进行编码的方法，每个数据分组包括一组代表与之对应的信息流的分段的有效载荷信息。 该方法包括以下步骤：对用于传输的第一数据分组进行编码（其中编码的第一数据分组包括表示信息流的第一分段的第一组有效载荷信息），以及将第二数据分组子序列编码到第一数据 分组（其中编码的第二数据分组包括表示信息流的第一分段之后的信息流的第二分段的第二组有效载荷信息）。 编码的第二数据分组还包括附加的有效载荷信息集合，附加的有效载荷集合还表示信息流的第一段，但不代表信息流的其他段。
-
公开(公告)号：US06272660B1
公开(公告)日：2001-08-07
申请号：US09143911
申请日：1998-08-31
IPC分类号： H03M1303
CPC分类号： H03M13/09 , H03M13/23 , H03M13/4115 , H03M13/413 , H03M13/6502
摘要： The likelihood of significant errors in a decoded sequence is determined based on at least one criterion that is both extrinsic and intrinsic to the decoded sequence. In particular, this determination is preferably made by comparing a signal corresponding to the decoded sequence with a so-called error mitigation signal.
摘要翻译： 基于解码序列的外在和固有的至少一个标准来确定解码序列中的显着错误的可能性。 特别地，该确定优选通过将与解码序列相对应的信号与所谓的误差减轻信号进行比较来进行。
-
公开(公告)号：US4047151A
公开(公告)日：1977-09-06
申请号：US644804
申请日：1975-12-29
摘要： A method for effecting error protecting coding in digitally modulated analog information as a function of the quality of transmission characteristics in the communication channel is provided in which the error code is embodied in the source code word, such as by reducing the number of significant bits and substituting error protecting code bits. This results in the maintenance of transmission capacity while providing the space needed for the redundant signals required to preclude error.
摘要翻译： 提供了一种在数字调制的模拟信息中作为通信信道中的传输特性的质量的函数进行误差保护的方法，其中错误代码体现在源代码字中，例如通过减少有效位的数量， 代替错误保护代码位。 这导致了传输容量的维护，同时提供了排除错误所需的冗余信号所需的空间。
-
14.发明授权公开(公告)号：US06961432B1
公开(公告)日：2005-11-01
申请号：US09454027
申请日：1999-12-03
CPC分类号： H04H20/88 , H04H20/22 , H04H20/74 , H04L1/0065
摘要： In a digital audio broadcast system, to utilize transmission bandwidth efficiently, representations of a stereo audio signal for transmission are generated in accordance with an inventive multidescriptive coding technique. The representations, as generated, are then transmitted through multiple communication channels, respectively. The transmitted representations are received by a receiver where one or more of the representations are selected for recovery of the stereo audio signal. Because of the design of the multidescriptive coding used, the more representations are selected to recover the stereo audio signal, the higher the quality of the recovered signal.
摘要翻译： 在数字音频广播系统中，为了有效地利用传输带宽，根据本发明的多指令编码技术产生用于传输的立体声音频信号的表示。 所生成的表示分别通过多个通信信道发送。 发送的表示由接收机接收，其中一个或多个表示被选择用于恢复立体声音频信号。 由于使用了多重编码编码的设计，选择更多的表示来恢复立体声音频信号，恢复信号的质量越高。
-
15.发明授权Channel coding with unequal error protection for multi-mode source coded information 有权对多模式源编码信息具有不等错误保护的信道编码公开(公告)号：US06694474B2
公开(公告)日：2004-02-17
申请号：US09814505
申请日：2001-03-22
IPC分类号： H03M1300
摘要： Source-coded information from a multi-mode source encoder is channel coded for transmission in a communication system. A multi-mode channel encoder associates a different channel coding error protection profile with each of the modes of the multi-mode source encoder. The channel encoder determines a mode used by the multi-mode source encoder to source code a given frame or other designated portion of the information, and channel codes the source-coded portion of the information utilizing an error protection profile identified at least in part based on the determined mode. A multi-mode channel decoder is operative to hypothesize that a particular one of the modes of the multi-mode source encoder was used to source code the designated portion of the information. The channel decoder analyzes at least part of a set of corresponding channel-coded information using an error protection profile associated with the hypothesized mode of the multi-mode source encoder, in order to determine if the error protection profile and the hypothesized mode are appropriate for respective channel decoding and source decoding of the designated portion of the information.
摘要翻译： 来自多模式源编码器的源编码信息被通道编码用于在通信系统中传输。 多模信道编码器将不同的信道编码错误保护配置文件与多模式源编码器的每种模式相关联。 信道编码器确定多模式源编码器使用的模式，以给定信息的给定帧或其他指定部分的源代码，并且使用至少部分地基于标识的错误保护简档对信息的源代码部分进行编码 在确定的模式。 多模式信道解码器用于假设多模式源编码器的特定模式用于对指定部分的信息进行源代码编码。 信道解码器使用与多模式源编码器的假设模式相关联的错误保护简档来分析一组相应的信道编码信息的至少一部分，以便确定误差保护简档和假设模式是否适合于 对信息的指定部分进行各自的信道解码和源解码。
-
16.发明授权公开(公告)号：US06357029B1
公开(公告)日：2002-03-12
申请号：US09238138
申请日：1999-01-27
IPC分类号： H03M1300
CPC分类号： H04L1/0083 , H04H2201/17 , H04H2201/20 , H04L1/0054 , H04L1/0065 , H04L1/0071 , H04L1/08
摘要： Methods and apparatus for processing information, e.g., audio, video or image information, for transmission in a communication system are disclosed. In an illustrative embodiment, a multiple program coder encodes a bitstream for each of the programs, in accordance with a specified bit allocation. An outer code encoder receives the encoded bitstreams from the multiple program coder, and jointly applies an outer code, e.g., a CRC code, RS code, BCH code or other type of linear block code, to subblocks of a subset of the resulting encoded bitstreams. The outer code is applied such that subblocks of each of the encoded bitstreams in the subset of the encoded bitstrcams are associated with a single outer code block. The number of subblocks associated with a given outer code block may be an integer or non-integer number of code blocks. The invention allows a designated number of program subblocks to share a given outer code block, such that outer code error flags can be generated for smaller groups of bits per program than would otherwise be possible. An inner code encoder may be used to apply an inner code, e.g., a convolutional code, turbo code or trellis coded modulation, to the resulting outer code blocks.
摘要翻译： 公开了用于处理用于在通信系统中传输的信息的方法和装置，例如音频，视频或图像信息。 在说明性实施例中，多程序编码器根据指定的位分配对每个程序的比特流进行编码。 外码编码器从多节目编码器接收编码的比特流，并且将外码（例如，CRC码，RS码，BCH码或其他类型的线性块码）联合应用于所得编码比特流的子集的子块 。 应用外部代码，使得编码比特率的子集中的每个编码比特流的子块与单个外部码块相关联。 与给定外部码块相关联的子块的数量可以是整数或非整数个码块。 本发明允许指定数量的程序子块共享给定的外部码块，使得可以针对比其他情况下可能的每个节目的较小比特组生成外部码错误标志。 内码编码器可以用于将内码（例如，卷积码，turbo码或网格编码调制）应用于所得到的外码块。
-
17.发明授权Unequal error protection for digital broadcasting using channel classification 有权使用信道分类的数字广播不平等的错误保护公开(公告)号：US06292917B1
公开(公告)日：2001-09-18
申请号：US09163656
申请日：1998-09-30
IPC分类号： H03M1300
CPC分类号： H04L1/0059 , H04L1/0068 , H04L1/007 , H04L27/2602 , H04L2001/0096 , H04L2001/0098
摘要： The invention provides methods and apparatus for processing information, e.g., audio, video or image information, for transmission in a communication system. In an illustrative embodiment, interference characteristics are determined for a set of n channels to be used to transmit audio information bits, where n is greater than or equal to two. The audio information bits are separated into n classes based on error sensitivity, for example, the impact of errors in particular audio data bits on perceived quality of an audio signal reconstructed from the transmission. The classes of bits are then assigned to the n channels such that the classes of bits having the greatest error sensitivity are transmitted over the channels which are the least susceptible to interference. The interference characteristics associated with the n channels can be determined by, for example, measuring interference levels for one or more of the channels, or obtaining information regarding known interference levels for one or more of the channels. The channels may correspond to different frequency bands, time slots, code division slots or any other type of channels. The invention can provide UEP for different classes of audio information bits even in cases in which the same convolutional code, or the same complementary punctured pair convolutional (CPPC) code pair, is used to encode the classes. The assignment of the classes of bits to the channels, as well as the characteristics of the classes and the channels, may be fixed or dynamic.
摘要翻译： 本发明提供了用于处理用于在通信系统中传输的信息（例如，音频，视频或图像信息）的方法和装置。 在说明性实施例中，针对要用于发送音频信息比特的一组n个信道确定干扰特性，其中n大于或等于2。 基于错误灵敏度将音频信息比特分为n类，例如，特定音频数据比特中的错误对从传输重建的音频信号的感知质量的影响。 然后将这些位分配给n个通道，使得具有最大误差灵敏度的位的类别通过最不易受干扰的信道进行传输。 可以通过例如测量一个或多个信道的干扰电平或获得关于一个或多个信道的已知干扰电平的信息来确定与n个信道相关联的干扰特性。 信道可以对应于不同的频带，时隙，码分时隙或任何其它类型的信道。 即使在使用相同卷积码或相同的互补穿孔对卷积（CPPC）码对来对类进行编码的情况下，本发明也可以为不同类别的音频信息比特提供UEP。 对通道的位类的分配以及类和通道的特性可以是固定的或动态的。
-
公开(公告)号：US06212654B1
公开(公告)日：2001-04-03
申请号：US08898441
申请日：1997-07-22
IPC分类号： G06F1100
CPC分类号： H03M13/6505 , G11C7/1006 , G11C27/00 , H03M13/05 , H03M13/23 , H03M13/25 , H03M13/41 , H03M13/413
摘要： Digital data is stored in an analog memory device using coded modulation techniques. The memory device includes a number of memory cells, each capable of storing one of a number of different levels. A given set of b information bits to be stored in the memory device is first coded in a convolutional or block coder to generate a set of coded bits which includes more than b bits. The set of coded bits is then mapped to one or more corresponding levels, and the one or more levels are each stored in a separate cell of the memory device. In a one-dimensional embodiment, the coding may involve applying a rate 1/2 convolutional code to i least significant bits, i=1, 2, . . . , and mapping the resulting b+i coded bits to one of 2b+i distinct levels in a one-dimensional AM signal set. In embodiments of the invention which utilize multidimensional signal sets, a given set of bits is mapped to a signal in an m-dimensional signal set, with or without coding of the bits, and each of the m dimensions of the selected signal is then stored as a level in a separate cell of the analog memory device. The invention increases the storage capacity of the memory device for a given readout error probability, or alternatively improves the error probability for a given storage capacity. Readout performance may be further improved by using a multiple read-and-sum unit to generate a readout value for a given stored level based on a sum or average of several different readouts of the stored level.
摘要翻译： 使用编码调制技术将数字数据存储在模拟存储装置中。 存储器件包括多个存储器单元，每个存储器单元能够存储多个不同级别中的一个。 要存储在存储器件中的一组给定的b信息位首先在卷积或块编码器中被编码，以产生包括多于b位的一组编码位。 然后将该组编码位映射到一个或多个相应的电平，并且一个或多个电平各自存储在存储器件的单独单元中。 在一维实施例中，编码可以包括将速率1/2卷积码应用于i = 1,2，...的至少有效位。 。 。 ，并将所得的b + i编码比特映射到一维AM信号组中的2b + i个不同级别之一。 在利用多维信号集的本发明的实施例中，给定的一组位被映射到m维信号组中的信号，具有或不具有位的编码，然后存储所选信号的m个维度中的每一个 作为模拟存储设备的单独单元中的电平。 本发明在给定的读出错误概率的情况下增加了存储器件的存储容量，或者提高了给定存储容量的误差概率。 通过使用多个读和和单元，基于所存储的电平的几个不同读出的和或平均值，为给定的存储电平产生读出值，可以进一步提高读出性能。
-
公开(公告)号：US06199186B1
公开(公告)日：2001-03-06
申请号：US09551483
申请日：2000-04-18
IPC分类号： H03M1300
CPC分类号： H03M13/6502 , H03M13/09 , H03M13/23 , H03M13/4115 , H03M13/413
摘要： For a transmission system in which (a) a received sequence of symbols is processed by an inner decoder followed by an outer decoder and (b) the inner decoder is capable of providing to the outer decoder more than one output sequence corresponding to the received sequence, the decoded sequence released by the outer decoder is screened for errors undetected by the outer decoder, if a predetermined criterion is satisfied.
摘要翻译： 对于传输系统，其中（a）接收的符号序列由内部解码器跟随外部解码器处理，并且（b）内部解码器能够向外部解码器提供多于一个对应于所接收序列的输出序列 如果满足预定标准，则由外部解码器释放的解码序列被筛选出不被外部解码器检测到的错误。
-
20.发明授权
公开(公告)号：US6075813A
公开(公告)日：2000-06-13
申请号：US834541
申请日：1997-03-18
摘要： In a system for simulcasting digitally modulated and analog FM signals over the same FM frequency band, the effect of the analog FM signal on the digitally modulated signal in the simulcast is calculated and canceled from the latter signal before its transmission. As a result, the digital transmission is free from interference from the analog FM signal. Moreover, the digital transmission is achieved by adaptively inserting a time varying number of carriers modulated by digital data into the FM band. The carriers are selected frame by frame to control their interference with the analog FM signal. In accordance with the invention, the carriers are selected in a predetermined order, and in a preferred embodiment grouped contiguously with one another in the FM band. As a result, the rate of control information required to identify the inserted carriers to a receiver is advantageously low.
摘要翻译： 在同频FM频段同步数字调制和模拟FM信号的系统中，模拟FM信号对联播中的数字调制信号的影响在传输之前被计算并从后一个信号中消除。 因此，数字传输不受模拟FM信号的干扰。 此外，通过将由数字数据调制的时变数量的载波适应性地插入到FM频带中来实现数字传输。 载波被逐帧选择以控制它们对模拟FM信号的干扰。 根据本发明，以预定顺序选择载波，并且在优选实施例中，在FM频带中彼此连续地分组。 结果，识别插入的载波到接收机所需的控制信息的速率有利地是低的。
-
-
-
-
-
-
-
-
-
搜索结果
35 条记录 (耗时 0.028 秒)
