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281 条记录 (耗时 0.046 秒)

    Apparatus for and method of speech digitizing
    133.
    发明授权
    Apparatus for and method of speech digitizing 失效
    语音数字化装置和方法

    公开(公告)号：US5727023A

    公开(公告)日：1998-03-10

    申请号：US120426

    申请日：1993-09-14

    申请人： Paul W. Dent

    发明人： Paul W. Dent

    IPC分类号： H04L27/18 ,  G10L19/00 ,  H03C1/54 ,  H03H1/02 ,  H03M1/00 ,  H03M1/38 ,  H03M3/02 ,  H03M3/04 ,  H04B1/26 ,  H04B1/40 ,  H04B7/26 ,  H04B14/06 ,  H04L25/03 ,  H04L27/00 ,  H04L27/20 ,  H04Q7/38

    CPC分类号： H03M3/024 ,  H03C1/542 ,  H03H1/02 ,  H04B1/0003 ,  H04B1/0014 ,  H04B1/0021 ,  H04B1/0039 ,  H04B1/26 ,  H04B1/40 ,  H04L25/03834 ,  H04L27/2017 ,  H04L27/2064

    摘要： A speech encoder converts analog speech signals into a stream of binary coded speech samples. A circuit for performing analog to digital conversion compares an input speech signal with a signal from a digital integrator. Based on the comparison a series of decisions are registered which indicate a step sign of the input signal. A syllabic filter generates a step magnitude according to the registered decisions. The step sign and step magnitude are combined providing a sign/magnitude representation of the input signal. When the sign/magnitude representation is integrated digitally in a decimation filter a digital representation of the analog signal is formed. A speech decoder, the antithesis of the encoder, converts binary coded speech samples into an analog waveform in a manner opposite to the A/D conversion method.

    摘要翻译： 语音编码器将模拟语音信号转换为二进制编码语音样本流。 用于执行模数转换的电路将输入语音信号与来自数字积分器的信号进行比较。 基于该比较，登记了指示输入信号的步进符号的一系列决定。 音节滤波器根据注册的决定产生一个步长。 组合步进符号和阶跃幅度提供输入信号的符号/幅度表示。 当符号/幅度表示被数字地集成在抽取滤波器中时，形成模拟信号的数字表示。 语音解码器与编码器的对比，以与A / D转换方法相反的方式将二进制编码的语音样本转换为模拟波形。

    Navigation assistance for call handling in mobile telephone systems
    134.
    发明授权
    Navigation assistance for call handling in mobile telephone systems 失效
    移动电话系统中呼叫处理的导航辅助

    公开(公告)号：US5670964A

    公开(公告)日：1997-09-23

    申请号：US384334

    申请日：1995-02-01

    申请人： Paul W. Dent

    发明人： Paul W. Dent

    IPC分类号： H04J13/04 ,  H04B7/005 ,  H04W52/22 ,  H04W52/28 ,  H04W64/00 ,  G01S3/02

    CPC分类号： H04W52/283 ,  H04W52/282 ,  H04W64/00 ,  H04W52/223 ,  H04W52/226

    摘要： In a mobile radio telephone system employing TDMA or CDMA, mobile units often must determine the timing and appropriate power necessary for transmissions to a base station. Information broadcast by base stations allows the mobile station to approximate its distance from each base station based on an average signal strength received and thereby determine the coarse sector location. Broadcast information may include the mean radial distribution of signal strength versus distance. From the broadcast information, the mobile station determines the propagation loss for a transmission to the base station and the appropriate power level and timing for transmissions. Accordingly, the mobile station transmits signals to the base station at the determined signal timing and power level.

    摘要翻译： 在采用TDMA或CDMA的移动无线电话系统中，移动单元通常必须确定向基站传输所需的定时和适当的功率。 由基站广播的信息允许移动台基于接收到的平均信号强度来近似来自每个基站的距离，从而确定粗略的扇区位置。 广播信息可以包括信号强度对距离的平均径向分布。 从广播信息中，移动台确定到基站的传输的传播损耗以及用于传输的适当功率电平和定时。 因此，移动台以确定的信号定时和功率电平向基站发送信号。

    Relaxation oscillator of reduced complexity using CMOS equivalent of a four-layer diode
    135.
    发明授权
    Relaxation oscillator of reduced complexity using CMOS equivalent of a four-layer diode 失效
    使用CMOS等效的四层二极管降低复杂度的松弛振荡器

    公开(公告)号：US5654677A

    公开(公告)日：1997-08-05

    申请号：US668815

    申请日：1996-06-24

    申请人： Paul W. Dent

    发明人： Paul W. Dent

    IPC分类号： H03K3/354 ,  H03K4/502 ,  H03K4/787 ,  H03K4/83 ,  H03B5/24 ,  H03C3/00

    CPC分类号： H03K3/354 ,  H03K4/502 ,  H03K4/787

    摘要： A relaxation oscillator of reduced complexity is described which can be constructed as part of a silicon integrated circuit. The current controlled oscillator includes complementary field effect transistors operating in enhancement mode. The drain of one FET is connected to the gate of the other FET and vice versa. The resulting CMOS circuit functions as a four-layer diode. A resistor is connected between the drains of both transistors. A storage capacitor is connected between the sources of both transistors. A current source is connected to charge the storage capacitor such that the frequency of an oscillator output signal is determined by the current generated by the current source.

    摘要翻译： 描述了可以构造为硅集成电路的一部分的复杂度降低的张弛振荡器。 电流控制振荡器包括以增强模式工作的互补场效应晶体管。 一个FET的漏极连接到另一个FET的栅极，反之亦然。 所产生的CMOS电路用作四层二极管。 电阻连接在两个晶体管的漏极之间。 存储电容器连接在两个晶体管的源极之间。 连接电流源以对存储电容器充电，使得振荡器输出信号的频率由电流源产生的电流确定。

    Multiple beamwidth phased array
    136.
    发明授权
    Multiple beamwidth phased array 失效
    多波束宽带相控阵

    公开(公告)号：US5642358A

    公开(公告)日：1997-06-24

    申请号：US225399

    申请日：1994-04-08

    申请人： Paul W. Dent

    发明人： Paul W. Dent

    IPC分类号： H01Q21/06 ,  H01Q1/28 ,  H01Q25/00 ,  H04B7/15 ,  H04B7/204 ,  H04B7/185

    CPC分类号： H01Q1/288 ,  H01Q25/00 ,  H04B7/2041

    摘要： A system for wireless communication between at least one first station and a plurality of second stations using a relay station is disclosed. The relay station contains, among other features, an antenna array and a multi-channel transponder. The antenna array has a plurality of antenna elements which are divided into two sets. The first set is used to provide transmission or reception using beams having a first beamwidth and the second set is used to provide transmission or reception using beams having a second beamwidth. The multi-channel transponder, which is connected to the antenna array and a feeder link antenna, receives feeder link signals from at least one of the first stations and converts the signals into drive signals for the antenna array elements. The multi-channel transponder has a first channel bandwidth for channels transponding signals for transmissions having the first beamwidth and a second channel bandwidth for channels transponding signals for transmissions having said second beamwidth. The plurality of second stations is divided dynamically by a switching system into at least a first group that use the narrowest beamwidth and a second group that use the widest beamwidth, according to the path loss requirements for each group.

    摘要翻译： 公开了一种使用中继站的至少一个第一站和多个第二站之间的无线通信系统。 除了其它特征之外，中继站还包含天线阵列和多信道应答器。 天线阵列具有被分成两组的多个天线元件。 第一组用于使用具有第一波束宽度的波束来提供发射或接收，并且第二组用于使用具有第二波束宽度的波束来提供发射或接收。 连接到天线阵列和馈线链路天线的多声道转发器接收来自第一站中的至少一个的馈线链路信号，并将该信号转换成天线阵列元件的驱动信号。 多信道转发器具有用于具有第一波束宽度的传输的信道的第一信道带宽和用于具有所述第二波束宽度的传输的信道的第二信道带宽。 根据每个组的路径损耗要求，多个第二站由交换系统动态划分为至少使用最窄波束宽度的第一组和使用最宽波束宽度的第二组。

    Waste energy control and management in power amplifiers
    137.
    发明授权
    Waste energy control and management in power amplifiers 失效

    公开(公告)号：US5638024A

    公开(公告)日：1997-06-10

    申请号：US472662

    申请日：1995-06-07

    申请人： Paul W. Dent ,  Ross W. Lampe

    发明人： Paul W. Dent ,  Ross W. Lampe

    IPC分类号： H03F3/68 ,  H03F1/02 ,  H03F1/32 ,  H03F3/60 ,  H04B1/04 ,  H04B1/16 ,  H04B1/52 ,  H04B7/185

    CPC分类号： H04B1/1607 ,  H03F1/0294 ,  H03F1/3229 ,  H03F1/3252 ,  H03F3/602 ,  H04B1/0483 ,  H04B1/52 ,  H04B1/04 ,  H04B2001/0433

    摘要： An amplifying apparatus for linearly amplifying a desired signal using a pair of coupled non-linear amplifiers is disclosed. The amplifying apparatus comprises a limiter for separating amplitude variations from the desired signal and producing a constant amplitude signal bearing the phase of the desired signal and an amplitude related signal. In addition, a drive signal generater produces two drive signals each dependent on the constant amplitude signal and the amplitude related signal such that each drive signal depends on the phase of the desired signal and such that the sum of the squares of the amplitudes of the drive signals is constant. Finally, a coupler couples the two drive signals to produce two constant amplitude signals for driving the pair of non-linear power amplifiers and for coupling the outputs of the power amplifiers to produce two amplified output signals, one of which is the linearly amplified desired signal and the other of which is a waste energy signal.

    Dual loop frequency synthesizer having fractional dividers
    139.
    发明授权
    Dual loop frequency synthesizer having fractional dividers 失效
    具有分数分频器的双回路频率合成器

    公开(公告)号：US5610559A

    公开(公告)日：1997-03-11

    申请号：US614722

    申请日：1996-03-13

    申请人： Paul W. Dent

    发明人： Paul W. Dent

    IPC分类号： H03L7/197 ,  H03L7/23 ,  H04B1/40 ,  H04B7/155 ,  H04B7/185

    CPC分类号： H04B7/18563 ,  H03L7/1974 ,  H03L7/23 ,  H04B1/406

    摘要： A radio telephone which is capable of switching between operating through a land based cellular network and an orbiting satellite system is disclosed. First antenna and radio frequency circuits receive transmitted signals from the land-based network and form first conditioned Signals for subsequent numerical decoding. Second antenna and radio frequency circuits receive transmitted signals from the orbiting satellite system and form second conditioned signals for subsequent numerical decoding. Numerical decoders process either the first conditioned signals or the second conditioned signals to provide an automatic frequency control signal. Reference frequency oscillators controlled by the automatic frequency control signal provide a reference frequency signal. Radio frequency synthesizers using the reference frequency signal and having a first output at a first programmable frequency connected to the first radio frequency circuits determine reception of a channel frequency of the land-based network and a second output at a second programmable frequency connected to the second radio frequency circuits determine reception of a channel frequency of the orbiting satellite system.

    摘要翻译： 公开了能够通过基于陆地的蜂窝网络和轨道卫星系统进行切换的无线电话。 第一天线和射频电路接收来自陆基网络的发射信号，并形成用于后续数字解码的第一条件信号。 第二天线和射频电路接收来自轨道卫星系统的传输信号，并形成第二条件信号用于随后的数字解码。 数字解码器处理第一调节信号或第二调节信号以提供自动频率控制信号。 由自动频率控制信号控制的参考频率振荡器提供参考频率信号。 使用参考频率信号并且具有连接到第一射频电路的第一可编程频率的第一输出的射频合成器确定陆基网络的信道频率的接收和连接到第二射频电路的第二可编程频率的第二输出 射频电路确定轨道卫星系统的信道频率的接收。

    Apparatus and method for adaptively precompensating for loudspeaker distortions
    140.
    发明授权
    Apparatus and method for adaptively precompensating for loudspeaker distortions 失效
    用于自适应预补偿扬声器失真的装置和方法

    公开(公告)号：US5600718A

    公开(公告)日：1997-02-04

    申请号：US393726

    申请日：1995-02-24

    申请人： Paul W. Dent ,  Jim A. J. Rasmusson ,  Ronald J. Johnsen

    发明人： Paul W. Dent ,  Jim A. J. Rasmusson ,  Ronald J. Johnsen

    IPC分类号： H04R3/02 ,  H04B3/23 ,  H04M1/60 ,  H04R3/00 ,  H04R3/04 ,  H04M9/08

    CPC分类号： H04R3/002

    摘要： In an audio system, a loudspeaker responds to an input signal producing a sound pressure wave having a linear component, which is linear function of the input signal, and an undesired non-linear component, which is a non-linear function of the input signal. Accordingly, it is desirable to reduce the non-linear component of the output sound pressure wave. An adaptive precompensating audio system for reducing this non-linear component includes a loudspeaker for producing a sound pressure wave and a precompensating filter for precompensating an input signal representative of the desired sound pressure wave. In addition, a microphone may be used to convert the resulting sound pressure wave into a sound signal and a precompensating filter modifier may be used to modify the precompensating filter in response to the sound signal. Preferably, the precompensating filter transforms the input signal using an inverse of an estimated transfer function for the loudspeaker.

    摘要翻译： 在音频系统中，扬声器响应于产生具有作为输入信号的线性函数的线性分量的声压波的输入信号和作为输入信号的非线性函数的非期望的非线性分量 。 因此，期望降低输出声压波的非线性分量。 用于减小该非线性分量的自适应预补偿音频系统包括用于产生声压波的扬声器和用于预补偿表示期望声压波的输入信号的预补偿滤波器。 此外，可以使用麦克风将所得到的声压波转换成声音信号，并且可以使用预补偿滤波器修改器来响应于声音信号来修改预补偿滤波器。 优选地，预补偿滤波器使用用于扬声器的估计传递函数的倒数变换输入信号。