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1.发明授权Methods and apparatuses for determining loop characteristics using an extended voice-band modem 失效使用扩展语音频带调制解调器确定回路特性的方法和装置公开(公告)号：US07406157B2
公开(公告)日：2008-07-29
申请号：US10655094
申请日：2003-09-03
申请人： Sigang Qiu , Prashant Pratap Tawade , Vedavalli G. Krishnan , Wesley H. Smith , Mandayam Krishnan
发明人： Sigang Qiu , Prashant Pratap Tawade , Vedavalli G. Krishnan , Wesley H. Smith , Mandayam Krishnan
CPC分类号： H04M3/306
摘要： Embodiments of the invention provide methods for determining the characteristics of a local loop using the multi-carrier tones of a DSL activation process. For one embodiment, one or more sets of downstream multi-carrier tones of a digital subscriber line activation process are received at an extended voice-band modem and are capable of transmitting upstream multi-carrier tones of the digital subscriber line activation process over a local loop. The downstream carrier tones and the upstream carrier tones are folded into a first multi-tone signal and a second multi-tone signal, respectively, each having a plurality of component signals within the spectrum band of the extended voice-based modem. The total signal power of the first multi-tone signal is divided by the power of one of the plurality of component signals of the second multi-tone signal to determine a ratio value. The ratio value is used to determine a characteristic of the local loop.
摘要翻译： 本发明的实施例提供了使用DSL激活过程的多载波音调来确定本地环路的特性的方法。 对于一个实施例，数字用户线激活过程的一组或多组下行多载波音调在扩展语音频带调制解调器处被接收，并且能够通过本地的数字用户线路激活过程的上行多载波音调发送 循环。 下游载波音调和上行载波音调分别被折叠成分别具有在扩展的基于语音的调制解调器的频谱范围内的多个分量信号的第一多音调信号和第二多音调信号。 将第一多音调信号的总信号功率除以第二多音调信号的多个分量信号之一的功率，以确定比值。 比值用于确定本地环路的特性。
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2.发明授权Use of lower bandwidth technology to determine channel capability for supporting higher bandwidth technology 失效使用较低带宽技术来确定支持更高带宽技术的通道能力公开(公告)号：US07133497B2
公开(公告)日：2006-11-07
申请号：US10112275
申请日：2002-03-29
申请人： Karl I. Nordling , Vedavalli G. Krishnan , Mandayam G. Krishnan , Fred Schuckert , Wesley H. Smith , Don Carmon
发明人： Karl I. Nordling , Vedavalli G. Krishnan , Mandayam G. Krishnan , Fred Schuckert , Wesley H. Smith , Don Carmon
摘要： Lower bandwidth technology is used to determine whether a communication channel can support higher bandwidth technology. A signal generator generates a series of test signals that are associated with the higher bandwidth technology. The test signals are sampled to produce aliases that can be analyzed with lower bandwidth technology. Modem parameters are accessed from a modem's memory. The modem parameters are compared with a database containing information about whether a set of modem parameters indicates that a telephone local can support broadband devices.
摘要翻译： 低带宽技术用于确定通信信道是否能够支持更高带宽的技术。 信号发生器产生与较高带宽技术相关联的一系列测试信号。 测试信号被采样以产生可以用较低带宽技术分析的别名。 调制解调器参数可以从调制解调器的内存访问。 将调制解调器参数与包含有关一组调制解调器参数是否指示本地电话可以支持宽带设备的信息的数据库进行比较。
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3.发明授权
公开(公告)号：US5850421A
公开(公告)日：1998-12-15
申请号：US636812
申请日：1996-04-23
CPC分类号： H04L7/027 , H04L27/3818 , H04L7/08
摘要： The present invention helps derive accurate clock and carrier translation presets in the presence of noise and various line shapes. The invention provides an adaptive algorithm that optimizes the calculations of clock slew (.DELTA.T.sub.s) and frequency offset (.DELTA.f) over the specific line conditions encountered at each connection by choosing an optimal subset of the communication device's probing frequencies that minimizes the effect of line losses and noise.
摘要翻译： 本发明有助于在存在噪声和各种线形状的情况下导出准确的时钟和载波转换预设。 本发明提供一种自适应算法，其通过选择通信设备的探测频率的最佳子集来优化在每个连接处遇到的特定线路条件下的时钟转换（DELTA Ts）和频率偏移（DELTA f）的计算， 损失和噪音。
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公开(公告)号：US4646320A
公开(公告)日：1987-02-24
申请号：US744891
申请日：1985-06-14
摘要： Apparatus employing microprocessor control for reconfiguring the strapping status of local and remote data modems automatically through a front panel display built into the modem.
摘要翻译： 采用微处理器控制的装置通过内置于调制解调器的前面板显示器自动重新配置本地和远程数据调制解调器的捆绑状态。
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公开(公告)号：US5185763A
公开(公告)日：1993-02-09
申请号：US683359
申请日：1991-04-09
CPC分类号： H04L25/4975 , H04L25/03343 , H04L27/3472
摘要： The present invention is directed toward a method and apparatus in a communications device for mapping a selected group of data bits into a predetermined number of two-dimensional symbols selected from a minimized alphabet of M two-dimensional symbols forming a symbol constellation, with one of the two-dimensional symbols being transmitter during each symbol (i.e., baud) interval. A plurality of symbol mappers in an adaptive communications device use a superframe of bits per baud. Each superframe includes at least two groups of frames, a low bit frame and a high bit frame. The superframe has A) one of these two types of frames uses whole bits per baud and the other uses fractional bits per baud or B) both of these two types of frames will use fractional bits per baud.
摘要翻译： 本发明涉及一种通信设备中的方法和装置，用于将所选择的数据比特组映射到从形成符号星座的M个二维符号的最小化字母表中选择的预定数量的二维符号中，其中之一 在每个符号（即波特）间隔期间，二维符号是发送器。 自适应通信设备中的多个符号映射器使用每波特率的比特超帧。 每个超帧包括至少两组帧，低位帧和高位帧。 超帧具有A）这两种类型的帧之一使用每个波特率的整数位，另一个使用每个波特率的分数位或B）这两种类型的帧都将使用每个波特率的分数位。
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公开(公告)号：US4761784A
公开(公告)日：1988-08-02
申请号：US4389
申请日：1987-01-15
CPC分类号： H03M13/25 , H04L27/3438
摘要： Disclosed is a modem including a transmitter having a convolutional encoder for transforming each group interval digital data into an expanded bit sequence having symbol-selecting bits and a frame of subset-selecting bits forming a plurality of bit groups, with each bit group designating a 2-dimensional subset and the symbol-selecting bits being used to select one 2-dimensional symbol from each of the selected subsets, the transmitter further providing modulation of a carrier signal, and a receiver wherein a commonality-seeking, branch cost calculator determines the candidate branch associated with the minimum cost N-dimensional symbol subset for each coset and a Viterbi decoder which determines the maximum likelihood path from a plurality of surviving paths formed from branches selected from the candidate branches.
摘要翻译： 公开了一种调制解调器，包括具有卷积编码器的发射机，用于将每个组间隔数字数据变换为具有符号选择位的扩展位序列和形成多个位组的子集选择位的帧，每个位组指定2 所述符号选择位用于从所选择的子集中的每一个中选择一个2维符号，所述发射机还提供载波信号的调制，以及接收机，其中寻求共同的分支成本计算器确定所述候选者 与每个陪集的最小成本N维符号子集相关联的分支以及从选自候选分支的分支形成的多个幸存路径中确定最大似然路径的维特比解码器。
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公开(公告)号：US5119403A
公开(公告)日：1992-06-02
申请号：US736370
申请日：1991-07-26
CPC分类号： H04L25/4975 , H04L25/03343 , H04L27/3472
摘要： The present invention is directed toward a method and apparatus in a communications device for mapping a selected group of data bits into a predetermined number of two-dimensional symbols selected from a minimized alphabet of M two-dimensional symbols forming a symbol constellation, with one of the two-dimensional symbols being transmitter during each symbol (i.e., baud) interval. A plurality of symbol mappers in an adaptive communications device use a superframe of bits per baud. Each superframe includes at least two groups of frames, a low bit frame and a high bit frame. The superframe has A) one of these two types of frames uses whole bits per baud and the other uses fractional bits per baud or B) both of these two types of frames will use fractional bits per baud.
摘要翻译： 本发明涉及一种通信设备中的方法和装置，用于将所选择的数据比特组映射到从形成符号星座的M个二维符号的最小化字母表中选择的预定数量的二维符号中，其中之一 在每个符号（即波特）间隔期间，二维符号是发送器。 自适应通信设备中的多个符号映射器使用每波特率的比特超帧。 每个超帧包括至少两组帧，低位帧和高位帧。 超帧具有A）这两种类型的帧之一使用每个波特率的整数位，另一个使用每个波特率的分数位或B）这两种类型的帧都将使用每个波特率的分数位。
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公开(公告)号：US4534043A
公开(公告)日：1985-08-06
申请号：US508103
申请日：1983-06-27
CPC分类号： H04L1/24
摘要： The presence of a predetermined pure sinusoidal signal is detected by periodically sampling the actual value of an input electrical signal and, based thereon, predicting what the expected value of the sinusoid would be at a next sampling instant if it is present. The actual and predicted future input signal values are then compared and a running average signal of the thus detected errors in predictions over plural such sampling and prediction cycles are compared to a preset threshold signal value to detect the presence of the predetermined tone. A modem receiver is turned off in the exemplary embodiment when the predetermined test tone is detected to prevent false data or "garbage" being output therefrom.
摘要翻译： 通过周期性地对输入电信号的实际值进行采样来检测预定的纯正弦信号的存在，并且基于此，预测如果存在正弦波的期望值将在下一个采样时刻。 然后比较实际和预测的未来输入信号值，并将在多个这样的采样和预测周期的预测中的这样检测到的误差的运行平均信号与预设的阈值信号值进行比较，以检测预定音调的存在。 当检测到预定测试音时，在示例性实施例中调制解调器接收机被关闭以防止从其输出错误数据或“垃圾”。
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