专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5691978A Self-cancelling full-duplex RF communication system 失效
标题翻译：自消除全双工RF通信系统
公开(公告)号：US5691978A
公开(公告)日：1997-11-25
申请号：US786197
申请日：1997-01-21
申请人： Gary Robert Kenworthy
发明人： Gary Robert Kenworthy
IPC分类号： H04B1/12 , H04B1/40 , H04B1/52 , H04B1/56 , H04B7/00 , H04B3/23
CPC分类号： H04B1/525 , H04B1/408 , H04B7/002 , H04B1/126 , H04B1/56
摘要： A method is presented herein whereby both transceivers of a full-duplex RF communications system can use the same spectrum at the same time. Self-interference is cancelled using a combination of antenna placement, analog RF suppression, and digital adaptive filtering. The details of this self-cancelling technique are presented.
摘要翻译：本文给出了一种方法，其中全双工RF通信系统的两个收发器可以同时使用相同的频谱。使用天线放置，模拟RF抑制和数字自适应滤波的组合来消除自干扰。介绍了这种自消除技术的细节。

2. 发明授权

US5640423A Method for signal transmission using spectrally efficient orthogonal modulation 失效
标题翻译：使用频谱高效正交调制的信号传输方法
公开(公告)号：US5640423A
公开(公告)日：1997-06-17
申请号：US168590
申请日：1993-12-16
申请人： Teri L. Archer
发明人： Teri L. Archer
IPC分类号： H04L27/26 , H04L5/12 , H03C3/00
CPC分类号： H04L27/2637 , H04L27/2653
摘要： A structure and a method for transmitting digital data modulate the amplitude and the phase of a set of orthogonal band-limited finite duration waveforms. In one embodiment, a group of information symbols modulate in parallel a set of spectrally efficient orthogonal waveforms, known as prolate spheroidal wave functions. The modulated orthogonal waveforms are summed, and the resulting composite signal then modulates a carrier signal for transmission. The compressed spectrum modulated signal provides a robust data waveform which reduces the spectral bandwidth requirements compared to digital modulation formats employed in the prior art. The transmitter and the receiver for modulating and demodulating the orthogonal waveforms for transmission operate at slower speeds than corresponding equipment of existing modulation schemes of comparable symbol rate. Consequently, both simplicity of design and cost savings are realized in a compressed spectrum modulation scheme.
摘要翻译：用于发送数字数据的结构和方法调制一组正交频带限制有限持续时间波形的振幅和相位。在一个实施例中，一组信息符号并行地调制一组频谱有效的正交波形，称为长椭球波函数。调制后的正交波形相加，结果合成信号调制载波信号进行传输。与现有技术中采用的数字调制格式相比，压缩频谱调制信号提供了一种鲁棒的数据波形，可减少频谱带宽要求。用于调制和解调用于传输的正交波形的发射器和接收器以比较可比符号速率的现有调制方案的相应设备的速度更慢地进行操作。因此，在压缩频谱调制方案中实现了设计的简单性和成本节约。

3. 发明授权

US5285499A Ultrasonic frequency expansion processor 失效
标题翻译：超声波频率扩展处理器
公开(公告)号：US5285499A
公开(公告)日：1994-02-08
申请号：US52986
申请日：1993-04-27
申请人： Dorothy A. Shannon , John P. King , Joseph T. DeWitte, Jr. , James D. Orndorff
发明人： Dorothy A. Shannon , John P. King , Joseph T. DeWitte, Jr. , James D. Orndorff
IPC分类号： H04R25/00 , H04R29/00 , A61B7/04
CPC分类号： H04R25/353
摘要： A method and apparatus for ultrasonic frequency expansion is characterized by expanding audiometric frequencies before translation into the ultrasonic range. The audiometric signals are first expanded in time by a factor of 1/.beta. where .beta.
摘要翻译：用于超声频率扩展的方法和装置的特征在于在平移到超声波范围之前扩大听力频率。首先将听力信号以1 /（β）的因子进行扩展，其中（β）<1，同时通常保持听力信号的频率含量。接下来，在将时间标度压缩到原始信号的频率的同时，信号的频率被扩展1 /（β）因子。频率扩展信号通过单边带上变频器进行处理，将频率扩展信号转换成超声波范围内的单边带信号。

4. 发明授权

US5524124A Multiple-filter equalizer for structured digitally modulated signals 失效
标题翻译：用于结构化数字调制信号的多滤波均衡器
公开(公告)号：US5524124A
公开(公告)日：1996-06-04
申请号：US153451
申请日：1993-11-17
申请人： Carolyn T. Koenig
发明人： Carolyn T. Koenig
IPC分类号： H04L25/03 , H03H7/30
CPC分类号： H04L25/03038
摘要： An equalization and demodulation method for a structured digitally modulated signal provides a multiple filter equalizer, which comprises multiple, parallel, automatically adjustable processors. The multiple filter equalizer is applicable to a structured digitally modulated signal, such as a signal from time division multiplexing (TDM) of multiple data sources. The multiple filter equalizer exploits the repetitive structure of TDM signal data by employing multiple parallel processors each constructed according to the specific requirements at the position in the frame of a symbol to be demodulated. Each processor comprises one or more adaptive digital transversal filters, one or more nonlinear threshold operators, and a symbol decision operator. The transversal filters equalize the data, remove interfering signals, reduce intersymbol interference, and mitigate multipath and other propagation effects. After the samples corresponding to one frame of information symbols are equalized in parallel, the equalized samples are demodulated in parallel to generate demodulated information symbols for that frame. The method is applicable to adaptive equalization both with and without a known training sequence.
摘要翻译：用于结构化数字调制信号的均衡和解调方法提供了一个多滤波均衡器，它包括多个并行的，可自动调节的处理器。多滤波均衡器适用于结构化数字调制信号，例如来自多个数据源的时分复用（TDM）信号。多滤波均衡器通过采用根据要解调的符号的帧中的位置的特定要求构建的多个并行处理器来利用TDM信号数据的重复结构。每个处理器包括一个或多个自适应数字横向滤波器，一个或多个非线性阈值运算符和符号判定算子。横向滤波器均衡数据，消除干扰信号，减少符号间干扰，并减轻多路径和其他传播效应。在对与一帧信息符号相对应的样本并行相等后，并行解调均衡样本，以产生该帧的解调信息符号。该方法适用于具有和不具有已知训练序列的自适应均衡。

5. 发明授权

US4888593A Time difference of arrival geolocation method, etc. 失效
标题翻译：时差到达地理定位方法等
公开(公告)号：US4888593A
公开(公告)日：1989-12-19
申请号：US147255
申请日：1987-12-15
申请人： Joseph S. Friedman , John P. King , Joseph P. Pride, III
发明人： Joseph S. Friedman , John P. King , Joseph P. Pride, III
IPC分类号： G01S3/50
CPC分类号： G01S3/50
摘要： A direction finding method and apparatus for a radio signal source, modulated by a digital information signal and existing in a heavy interference environment, is based on cyclic crosscorrelation. The direction finding technique exploits the second order periodicity of a transmitted signal having digital modulation, whereby the technique is immune to narrow-band interference. Radio frequency signals are received by two spaced antennas, and the signal of interest can be considered as a cyclostationary process. The signal time of arrival difference between the two antennas is determined using a cyclic crosscorrelation method. This is implemented by sending the electrical signals, developed by the antennas, through a variable delay device, then to a balanced mixer. The composite signal from the mixer is sent to a band-pass filter whose center frequency is equal to the baud rate of the signal of interest. The output energy of the filter is proportional to that portion of the cyclic crosscorrelation function where the cyclic frequency corresponds to the baud rate. With the use of a peak detector, which finds the peak values of the cyclic crosscorrelation function, the time difference of arrival between the two antennas is determined. This, in turn, determines a line of position to the radio source.
摘要翻译：用于由数字信息信号调制并且存在于严重干扰环境中的无线电信号源的测向方法和装置基于循环互相关。方向发现技术利用具有数字调制的发送信号的二阶周期性，由此该技术不受窄带干扰的影响。射频信号由两个间隔的天线接收，感兴趣的信号可以被认为是循环平稳过程。使用循环互相关方法确定两个天线之间的信号到达时间差。这是通过发送由天线开发的电信号通过可变延迟装置，然后发送到平衡混频器来实现的。来自混频器的复合信号被发送到中心频率等于感兴趣信号的波特率的带通滤波器。滤波器的输出能量与循环频率对应于波特率的循环互相关函数的那部分成正比。利用寻找循环互相关函数的峰值的峰值检测器，确定两个天线之间的到达时间差。这反过来又决定了无线电源的位置。

6. 发明授权

US3970987A Acoustical switch 失效
标题翻译：声学开关
公开(公告)号：US3970987A
公开(公告)日：1976-07-20
申请号：US474875
申请日：1974-05-31
申请人： Eric A. Kolm
发明人： Eric A. Kolm
IPC分类号： H04B11/00
CPC分类号： G01S1/72
摘要： An acoustical switch is actuated from a remote location by a sound generator such as an ultrasonic whistle. The switch includes a special tuned signal receiver coupled with an amplifier having a frequency selective feedback network. The output of the amplifier is an a.c. signal which is applied to a bistable circuit which, in one state, energizes a relay to turn on an appliance connected to the switch and, in its other state, turns the appliance off.
摘要翻译：通过诸如超声波口哨之类的声音发生器从远程位置致动声学开关。该开关包括与具有频率选择反馈网络的放大器耦合的特殊调谐信号接收器。放大器的输出是a.c. 信号，其被施加到双稳态电路，其在一种状态下使继电器通电以接通连接到开关的器具，并且在其它状态下关闭器具。

7. 发明授权

US5455846A Detection of a digitally modulated signal using binary line enhancement 失效
标题翻译：使用二进制线增强检测数字调制信号
公开(公告)号：US5455846A
公开(公告)日：1995-10-03
申请号：US153447
申请日：1993-11-17
申请人： Robert W. Gardner
发明人： Robert W. Gardner
IPC分类号： H04L7/027 , H04L27/00 , H04L27/06 , G06K9/46 , H03D1/00
CPC分类号： H04L27/00 , H04L7/027
摘要： Detection of a digitally modulated radio signal whose underlying data contain repetition structures is achieved by generating a binary spectrum from the frequency domain spectral amplitudes. The binary spectrum of the signal can be rastered at the signal's framing rate or other periodicity to create a two dimensional matrix with the set periodic bits falling along column of the matrix. Application of non-linear logical filtering operations removes speckle caused by aperiodic bits while maintaining the run of aligned periodic bits along the column of the matrix. To automate the line detection process, statistical values and measured line lengths in the binary matrix are used to adjust processing parameter values.
摘要翻译：其底层数据包含重复结构的数字调制无线电信号的检测是通过从频域频谱幅度生成二进制频谱来实现的。信号的二进制频谱可以以信号的成帧速率或其他周期性进行修整，以创建具有沿矩阵列的集合周期比特的二维矩阵。非线性逻辑滤波操作的应用消除了由非周期性位引起的散斑，同时保持沿着矩阵列的排列的周期位的运行。为了自动化线路检测过程，使用二进制矩阵中的统计值和测量线路长度来调整处理参数值。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式