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    • 4. 发明授权
    • Cordless connection for a data/fax modem
    • 数据/传真调制解调器的无线连接
    • US6128510A
    • 2000-10-03
    • US855502
    • 1997-05-13
    • Troy James BeukemaMichael Frank CinaEphraim Bemis FlintBrian Paul GaucherYoung Hoon KwarkModest Michael OpryskoWilliam Edward PenceSaila Ponnapalli
    • Troy James BeukemaMichael Frank CinaEphraim Bemis FlintBrian Paul GaucherYoung Hoon KwarkModest Michael OpryskoWilliam Edward PenceSaila Ponnapalli
    • H04M1/725H04M11/00H04W4/18H04W24/00H04W68/00H04W76/02H04W84/10H04W88/08H04Q7/20
    • H04W68/00H04M1/725H04W24/00H04W4/18H04W76/02H04W84/10H04W88/08
    • A cordless modem comprises a radio pair interfaced to a standard data/fax modem which allows a user of a personal computer to wirelessly connect to a telephone line. One end of the radio pair is a remote unit interfaced to the modem contained within the PC while the other end is a base unit connected to a standard telephone wall jack. The base unit can selectively discriminate and adjust for signals received from a telephone voice handset or data signals received from the cordless modem remote unit. Upon receiving an off-hook signal or an incoming call signal, the base unit identifies the type of data (i.e., voice or computer modem data) and adapts accordingly by placing an FM modulator in either of a narrow band deviation or a wide band deviation covering the required range of the particular signal combined with local echo. That is, when voice data is present, a low deviation, narrow filter combination is selected. If, on the other hand, the computer data from the cordless modem is detected, a higher deviation, wider bandwidth filter is selected. In addition, the remote unit switches a pre-detection filter from one mode to another depending on whether it is connected to a computer modem or to a voice handset. Security from eavesdroppers as well as the mitigation of signal fading is provided by overlaying a pseudo-random number (PN) code on the FM modulated signal.
    • 无线调制解调器包括接口到标准数据/传真调制解调器的无线电对,其允许个人计算机的用户无线地连接到电话线。 无线电对的一端是与包含在PC内的调制解调器接口的远程单元,而另一端是连接到标准电话墙壁插座的基座单元。 基本单元可以有选择地识别和调整从电话语音手机接收的信号或从无绳调制解调器远程单元接收的数据信号。 在接收到摘机信号或来电信号时,基本单元识别数据的类型(即语音或计算机调制解调器数据),并通过将FM调制器置于窄带偏差或宽带偏差 涵盖特定信号与本地回波结合的所需范围。 也就是说,当存在语音数据时,选择低偏差,窄的滤波器组合。 另一方面,如果检测到来自无绳调制解调器的计算机数据,则选择较高偏差的较宽带宽滤波器。 此外,远程单元根据是否连接到计算机调制解调器或语音手机将预检测滤波器从一种模式切换到另一种模式。 通过在FM调制信号上重叠伪随机数(PN)码来提供来自窃听者的安全性以及信号衰落的减轻。
    • 9. 发明授权
    • Method of extracting 3-D capacitance and inductance parasitics in sub-micron VLSI chip designs using pattern recognition and parameterization
    • 使用模式识别和参数化提取亚微米VLSI芯片设计中的3-D电容和电感寄生效应的方法
    • US06175947B1
    • 2001-01-16
    • US09062853
    • 1998-04-20
    • Saila PonnapalliTimothy LehnerSanjay Upreti
    • Saila PonnapalliTimothy LehnerSanjay Upreti
    • G06F1716
    • G06F17/5036
    • A method for accurately extracting capacitance and inductance parasitics from an electrical network representing a three-dimensional wiring of an integrated circuit chip or module is described. The extraction process can be performed either prior to or after completing a detailed wiring of the chip. In the former case, the method utilizes congestion information and approximate wiring length data to estimate the probability of encountering a particular pattern and the most accurate estimated capacitance which can arrived at. In the latter case, the wiring is partitioned into three-dimensional recognizable patterns, and a database of precomputed parasitics for each pattern is queried in order to obtain highly accurate parasitics within a limited number of machine cycles. The number of patterns is assumed to be sufficiently small to be memory and time efficient and to be arrived at in real-time.
    • 描述了一种从表示集成电路芯片或模块的三维布线的电网精确地提取电容和电感寄生效应的方法。 提取过程可以在完成芯片的详细布线之前或之后进行。 在前一种情况下,该方法利用拥塞信息和近似布线长度数据来估计遇到特定模式的概率和可以达到的最准确的估计电容。 在后一种情况下,布线被划分成三维可识别的图案,并且查询每个图案的预计算寄生效应的数据库,以便在有限数量的机器周期内获得高精度的寄生效应。 模式的数量被假定为足够小以便成为记忆和时间有效的并且被实时地实现。