公开(公告)号：US06611563B1

公开(公告)日：2003-08-26

申请号：US09429799

申请日：1999-10-29

申请人： Gordon Taylor Davis ,  Ajay Dholakia ,  Malcolm Scott Ware

发明人： Gordon Taylor Davis ,  Ajay Dholakia ,  Malcolm Scott Ware

IPC分类号： H04B1404

CPC分类号： G11B20/1403 ,  H04B14/04 ,  H04L25/4927

摘要： Methods, systems and computer program products are provided for refining constellation values in a Pulse Code Modulated (PCM) code point sequence of a PCM modem by averaging received levels associated with received symbols for a code point of interest received during data mode operation of the PCM modem so as to provide an average received level for the code point of interest and revising a constellation value corresponding to the code point of interest in the PCM code sequence based on the average received level for the code point of interest so as to provide a refined constellation value. Preferably, the averaging is performed by detecting that a symbol corresponding to the code point of interest has been received by the PCM modem and incorporating the received level of the symbol into a running sum of previously received levels for the symbol. If a predefined number of received levels have been incorporated into the running sum then the running sum is divided by the predefined number of receive levels. It is also preferred that, after determining the sum for the code point of interest, the running sum is set to zero and a new code point selected as the code point of interest.

摘要翻译： 提供了方法，系统和计算机程序产品，用于通过对在PCM的数据模式操作期间接收到的感兴趣代码点的接收到的符号进行平均的接收电平来对PCM调制解调器的脉码调制（PCM）码点序列中的星座值进行平均化 调制解调器，以提供感兴趣的代码点的平均接收电平，并且基于用于代码点的平均接收电平来修改与PCM码序列中的码感兴趣点相对应的星座值，以便提供精确的 星座价值 优选地，通过检测到PCM调制解调器已经接收到与感兴趣的代码点相对应的符号，并将符号的接收电平并入先前接收到的符号电平的运算和来执行平均。 如果预定义数量的接收电平已被合并到运行总和中，则运行总和除以预定数量的接收电平。 还优选的是，在确定感兴趣的代码点的和之后，将运行和设置为零，并将新的代码点选为感兴趣的代码点。

公开(公告)号：US06512796B1

公开(公告)日：2003-01-28

申请号：US09082395

申请日：1998-05-20

申请人： Douglas Sherwood

发明人： Douglas Sherwood

IPC分类号： H04B1404

CPC分类号： H04H20/14 ,  G10L19/018 ,  G11B20/10009 ,  H04H20/31

摘要： A method and apparatus for encoding data into an audio signal and subsequently extracting the data comprises combining the data signal and a chosen interval of the audio signal in a manner in which the data signal is essentially inaudible. The data signal preferably includes synchronization data to assist in identifying the data in a composite data and audio signal. In a preferred embodiment, digital data is combined with a digitized audio signal in a bit-wise manner, the amplitude of each data bit being individually chosen to be decodable when passed through a particular receiver. Alternative insertion location along the length of a given audio segment may be compared to identifying a preferred insertion location. To extract the data signal from the resulting composite signal the composite signal is digitized, preferably passed through a bandpass filter, and compared on a bit-wise basis with the known pattern of the synchronization data. Correlation with the synchronization data identifies the data signal which can then be extracted in its entirety.

摘要翻译： 用于将数据编码成音频信号并随后提取数据的方法和装置包括以数据信号基本上听不到的方式组合数据信号和音频信号的选定间隔。 数据信号优选地包括同步数据以帮助识别复合数据和音频信号中的数据。 在优选实施例中，数字数据以逐位方式与数字化音频信号组合，每个数据位的幅度被单独选择为在通过特定接收器时可解码。 可以将沿着给定音频段的长度的替代插入位置与识别优选插入位置进行比较。 为了从所得到的复合信号中提取数据信号，复合信号被数字化，优选地通过带通滤波器，并且在逐位的基础上与已知的同步数据模式进行比较。 与同步数据的相关性识别出可以全部提取的数据信号。

公开(公告)号：US06501797B1

公开(公告)日：2002-12-31

申请号：US09347881

申请日：1999-07-06

申请人： Mihaela van der Schaar ,  Yingwei Chen ,  Hayder Radha

发明人： Mihaela van der Schaar ,  Yingwei Chen ,  Hayder Radha

IPC分类号： H04B1404

CPC分类号： H04N19/34 ,  H04N19/103 ,  H04N19/137 ,  H04N19/146 ,  H04N19/187 ,  H04N19/29 ,  H04N19/33 ,  H04N19/37

摘要： There is disclosed an apparatus for controlling the transmission of enhancement layer video data for use in a video encoder containing a base layer encoder and an enhancement layer encoder. The base layer encoder receives input video frames and generates compressed base layer video frames suitable for transmission at a base layer bit rate to a streaming video receiver. The enhancement layer encoder compares the input video frames and a processed version of the compressed base layer video frames and generates enhancement layer video data suitable for transmission at a modifiable enhancement layer bit rate to the streaming video receiver. The apparatus comprises a base layer parameter monitor for receiving at least one base layer parameter and, in response thereto, modifying an allocation of the enhancement layer video data among corresponding ones of the compressed base layer video frames.

摘要翻译： 公开了一种用于控制在包含基本层编码器和增强层编码器的视频编码器中使用的增强层视频数据的传输的装置。 基层编码器接收输入视频帧，并产生适合于以基层比特率传输的压缩基层视频帧到流视频接收机。 增强层编码器比较输入视频帧和经压缩的基本层视频帧的处理版本，并生成适于以可修改的增强层比特率传输到流式视频接收机的增强层视频数据。 该装置包括用于接收至少一个基本层参数的基本层参数监视器，并且响应于此，在相应的压缩基本层视频帧中修改增强层视频数据的分配。

公开(公告)号：US06496540B1

公开(公告)日：2002-12-17

申请号：US09120675

申请日：1998-07-22

申请人： Albert X. Widmer

发明人： Albert X. Widmer

IPC分类号： H04B1404

CPC分类号： H04L25/4908 ,  H03M5/04 ,  H03M13/00

摘要： A method of coding parallel data for transmission while maintaining baud rate includes the steps of providing a plurality of uncoded data blocks having a predetermined baud rate, demultiplexing the data blocks to sequentially distribute the data blocks to encoders, encoding the data blocks at the predetermined baud rate, and serializing the coded data blocks for serially transmitting data at the predetermined baud rate. A system for coding parallel data for serial transmission while maintaining baud rate is included wherein the predetermined baud rate is maintained by providing an adequate number transmission links rather than increasing baud rate.

摘要翻译： 一种在维持波特率的同时对并行数据进行编码的方法包括以下步骤：提供具有预定波特率的多个未编码数据块，多路分解数据块以将数据块顺序分配到编码器，以预定波特率对数据块进行编码 速率和串行化用于以预定波特率串行发送数据的编码数据块。 包括用于在保持波特率的情况下编码用于串行传输的并行数据的系统，其中通过提供足够数量的传输链路而不是增加波特率来维持预定的波特率。

公开(公告)号：US06351492B1

公开(公告)日：2002-02-26

申请号：US09106081

申请日：1998-06-29

申请人： Jin-Hun Kim

发明人： Jin-Hun Kim

IPC分类号： H04B1404

CPC分类号： H04N19/649 ,  H04N19/20

摘要： The encoding type of a target macroblock is determined based on the texture information thereof, and the shape information and the texture information on the target macroblock are re-formed in response to the encoding type. After the CBPY bit number of the target macroblock is determined based on the re-formed shape information, the CBPY bit number being the number of non-transparent subblock's, the re-formed texture information of the target macroblock transformed and quantized into a set of quantized transformation coefficients for each non-transparent subblock based on the CBPY bit number. The CBPY information for the target macroblock is generated, wherein the CBPY information represents whether or not the set of quantized transformation coefficients for said each non-transparent subblock contains at least one non-zero component therein, and the encoding_type and the CBPY information for the target macroblock are multiplexed into a bit stream.

摘要翻译： 基于其纹理信息来确定目标宏块的编码类型，并且响应于编码类型重新形成关于目标宏块的形状信息和纹理信息。 在基于重新形成的形状信息确定目标宏块的CBPY比特数之后，CBPY比特数是非透明子块的数量，被转换和量化为一组的目标宏块的重新形成的纹理信息 基于CBPY位数的每个非透明子块的量化变换系数。 生成用于目标宏块的CBPY信息，其中CBPY信息表示所述每个不透明子块的量化变换系数集合是否包含至少一个非零分量，以及编码类型和CBPY信息 目标宏块被复用到比特流中。

公开(公告)号：US06343101B1

公开(公告)日：2002-01-29

申请号：US09008101

申请日：1998-01-16

申请人： Ping Dong ,  Kuo-Yu Lin

发明人： Ping Dong ,  Kuo-Yu Lin

IPC分类号： H04B1404

CPC分类号： H04B14/04

摘要： A spectral shaping PCM modem communication system uses a symbol encoder to encode a data bit stream into a PCM symbol stream. A plurality of different frames are formed from the PCM symbol stream. Performance metrics are computed for each possible frame and its inversion so a decision can be made in order to select a most desirable frame and inversion. Delays are injected in the data flow to allow a look-ahead and thus provide for better frame selection and inversion decisions. A channel multiplexer combines decision bits and output frames to form encoded output frames that are fed to a digital channel connected to a telephone network wherein they are converted to analog signal. A corresponding decoder converts analog signals from the telephone network to digital signals. A timing recovery and equalization means corrects sample timing and removes inter-symbol interference effects introduced by telephone networks. The output of the equalizer is sampled at correct timing to recover the received samples and received frame. A channel de-multiplexer separates the frame selection and frame inversion decision bits from the symbol frames received. Inversion and framing decisions are discerned from the demultiplexed frame selection and frame inversion decision bits. Original PCM symbol frames are reconstructed and PCM symbols are decoded into a data bit stream. A non-negative shell mapping may be used as the symbol encoder. A decoder checks to see if a currently received frame is negative. If it is, then all samples in such current frame are inverted. Otherwise, all samples in the current frame are unchanged. The resulting frames are then forwarded to a non-negative shell mapping decoder for eventual reconversion to digital data.

摘要翻译： 频谱整形PCM调制解调器通信系统使用符号编码器将数据比特流编码成PCM符号流。 从PCM符号流形成多个不同的帧。 对于每个可能的帧及其反演来计算性能度量，以便可以做出决定以选择最理想的帧和反演。 在数据流中注入延迟以允许先行，从而提供更好的帧选择和反演决策。 信道多路复合器组合决策位和输出帧以形成被馈送到连接到电话网络的数字信道的编码输出帧，其中它们被转换为模拟信号。 相应的解码器将来自电话网络的模拟信号转换成数字信号。 定时恢复和均衡意味着校正采样定时并消除电话网络引入的符号间干扰效应。 在正确的定时对均衡器的输出进行采样，以恢复接收到的采样和接收的帧。 信道解复用器将帧选择和帧反转决策位与接收的符号帧分离。 从解复用的帧选择和帧反转决定位中辨别反转和成帧决策。 原始PCM符号帧被重建并且PCM符号被解码成数据比特流。 可以使用非负外壳映射作为符号编码器。 解码器检查当前接收的帧是否为负。 如果是，则当前帧中的所有样本都被反转。 否则，当前帧中的所有样本都不变。 然后将所得到的帧转发到非负壳映射解码器，以最终重新转换为数字数据。

公开(公告)号：US06744819B1

公开(公告)日：2004-06-01

申请号：US09656804

申请日：2000-09-07

申请人： Keith T. Chu ,  Sverrir Olafsson

发明人： Keith T. Chu ,  Sverrir Olafsson

IPC分类号： H04B1404

CPC分类号： H04B14/04

摘要： Various systems and methods are provided in a client, a line card or other conversion device, and a server to implement either a linear or a nonlinear PCM transmission mode for data communication in a data communications network. The client and the server negotiate with each other to establish a specific data communications mode. The data communications mode may be, for example, linear pulse code modulation (PCM) or nonlinear PCM. To begin, the client informs the server whether it supports nonlinear PCM, linear PCM, or both. In light of the clients communications capability and the modes supported by the server itself, the server responds by informing the client which data communications mode is to be used. In the case that both the client and server support linear and nonlinear PCM, the server informs the client that linear PCM is to be used, such being more conducive to accurate high-speed data communication. In the case that one of either the client or the server only supports nonlinear mode, the server informs the client that nonlinear PCM is to be employed. Assuming that linear PCM is specified as the data communications mode between the client and the server, the server then transmits a message to the line card that informs the line card that linear PCM is to be used.

摘要翻译： 在客户机，线路卡或其他转换设备中提供各种系统和方法，以及服务器，以实现用于数据通信网络中的数据通信的线性或非线性PCM传输模式。 客户端和服务器进行协商，建立特定的数据通信模式。 数据通信模式可以是例如线性脉码调制（PCM）或非线性PCM。 首先，客户端通知服务器是否支持非线性PCM，线性PCM或两者。 鉴于客户端的通信能力和服务器本身支持的模式，服务器通过向客户端通知要使用哪种数据通信模式进行响应。 在客户端和服务器都支持线性和非线性PCM的情况下，服务器通知客户端将使用线性PCM，从而更有利于准确的高速数据通信。 在客户机或服务器之一仅支持非线性模式的情况下，服务器通知客户端将使用非线性PCM。 假设线性PCM被指定为客户端和服务器之间的数据通信模式，则服务器然后向线卡发送消息，通知线路卡将使用线性PCM。

公开(公告)号：USRE38244E1

公开(公告)日：2003-09-02

申请号：US09648467

申请日：2000-08-11

申请人： Jin Soo Han ,  Byong Jin Cho

发明人： Jin Soo Han ,  Byong Jin Cho

IPC分类号： H04B1404

CPC分类号： H04W88/181

摘要： A method of bypassing vocoders in a digital mobile communication system, comprising the step of appending bypass mode data to data transmitted from a plurality of mobile stations, the bypass mode data instructing the vocoders not to perform encoding/decoding operations, and the step of transmitting the resultant data. According to the present invention, the unnecessary encoding/decoding operations are omitted for a mobile to mobile communication. Therefore, the present invention has the effect of removing the delay time and enhancing the voice quality.

公开(公告)号：US06574482B1

公开(公告)日：2003-06-03

申请号：US09434716

申请日：1999-11-05

申请人： Israel Radomsky ,  Israel Abrams ,  Yossef Bruslavsky

发明人： Israel Radomsky ,  Israel Abrams ,  Yossef Bruslavsky

IPC分类号： H04B1404

CPC分类号： A61B5/1113 ,  A61B5/1127 ,  A61B5/117 ,  A61B2560/0209 ,  G07C9/00111 ,  G08B3/1083 ,  G08B21/0222 ,  G08B21/0227 ,  G08B21/023 ,  G08B21/0247 ,  G08B21/0286 ,  H04B10/1149

摘要： A communication device including an RF transmitter mounted in conjunction with an IR transmitter allowing data to be transmitted by RF as well as by IR. Such a device may be a portable badge worn by moving personnel to transmit IR and RF signals to one of a plurality of second devices each being a fixed reader having an IR and RF receiver, and typically being mounted in a respective enclosed space, such as a room. In use, IR transmissions from the portable device are detected by the IR receiver of the reader in the same room and thus provide an immediate identification of the room (or enclosed space) wherein the portable device is located. On the other hand, if the IR transmitter in the portable device is concealed or for any other reason is not within line-of-sight of the reader in its immediate proximity, then the RF signal transmitted by the RF transmitter in the portable device is detected by the RF receiver in the reader, thereby allowing tracking of the portable device in either eventuality.

摘要翻译： 一种通信设备，包括与IR发射器一起安装的RF发射机，允许通过RF以及IR发送数据。 这样的装置可以是移动人员将IR和RF信号传输到多个第二设备中的一个的便携式标志，每个第二设备是具有IR和RF接收器的固定读取器，并且通常安装在相应的封闭空间中，例如 一个房间。 在使用中，来自便携式设备的IR传输由读取器的IR接收器在相同的房间中检测，并因此提供便携式设备所在的房间（或封闭空间）的即时识别。 另一方面，如果便携式设备中的IR发送器被隐藏或出于任何其他原因，则不在其紧邻的读取器的视线范围内，则由便携式设备中的RF发射器发送的RF信号是 由读取器中的RF接收器检测，从而允许在任何情况下跟踪便携式设备。

公开(公告)号：US06563878B1

公开(公告)日：2003-05-13

申请号：US09364575

申请日：1999-07-30

申请人： Gerald Hoefer

发明人： Gerald Hoefer

IPC分类号： H04B1404

CPC分类号： H04L25/4927

摘要： A method is disclosed for generating a PCM code set for encoding data by a PCM encoder in a data transmission system having a digital modem with a PCM encoder, a digital signal transmission path, an analogue signal transmission path with a central office line interface portion, and an analogue modem. The method includes the step of determining a minimum signal level distance between adjacent PCM codes of the PCM code set, the minimum signal level distance enabling discrimination by the analogue modem. Then a line interface attenuation of the central office line interface portion is determined. Finally, the PCM code set on the basis of a power limit computed by adding the line interface attenuation to a central office line interface power limit is generated. The invention further relates to an analogue modem to be operated in such a data transmission system.

摘要翻译： 公开了一种用于在具有PCM编码器的数字调制解调器，数字信号传输路径，具有中心局线路接口部分的模拟信号传输路径的数据传输系统中生成由PCM编码器对PCM数据进行编码的PCM码集的方法， 和模拟调制解调器。 该方法包括确定PCM码集的相邻PCM码之间的最小信号电平距离的步骤，即可以由模拟调制解调器鉴别的最小信号电平距离。 然后确定中心局线路接口部分的线路接口衰减。 最后，生成基于通过将线路接口衰减添加到中心局线路接口功率限制而计算的功率限制而设置的PCM码。 本发明还涉及在这种数据传输系统中操作的模拟调制解调器。