利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

394 条记录 (耗时 0.014 秒)

    Calibration of vector modulators using a scalar detector
    41.
    发明授权
    Calibration of vector modulators using a scalar detector 失效
    使用标量检测器校准矢量调制器

    公开(公告)号：US4717894A

    公开(公告)日：1988-01-05

    申请号：US922383

    申请日：1986-10-23

    申请人： Allen P. Edwards ,  David R. Gildea ,  Chung Y. Lau

    发明人： Allen P. Edwards ,  David R. Gildea ,  Chung Y. Lau

    IPC分类号： G01R35/00 ,  H04J11/00 ,  H04L27/00 ,  H04L27/36 ,  H03C5/00

    CPC分类号： H04L27/364 ,  G01R35/005 ,  H04L2027/0016 ,  H04L2027/0018

    摘要： Calibration of a vector modulator is done using a scalar detector to measure the amplitude of the RF output signal, phase shifters to adjust the relative phases of the I and Q components of the RF carrier, and variable attenuators in the I and Q modulation signal input lines to adjust the relative amplitude of the modulation signals. DC signal sources provide reference signals for the I and Q modulation inputs, carrier leak compensation signals, and calibration signals for balancing the amplitude of the I and Q modulation signals. An iterative four step calibration process is followed until no change in the results is observed. The quadrature phase error is minimized by adjusting the phase shifters. The carrier leakage is minimized by adjusting the carrier leak compensation sources to minimize RF output with the modulation inputs grounded. The amplitudes of the I and Q modulation signals are balanced by adjusting the attenuators until the output amplitudes are equal. Finally, the quadrature calibration signal sources are adjusted until the output amplitudes they produce are balanced.

    摘要翻译： 使用标量检测器来校准矢量调制器，以测量RF输出信号的幅度，移相器调整RF载波的I和Q分量的相对相位，以及I和Q调制信号输入中的可变衰减器 线调整调制信号的相对幅度。 直流信号源为I和Q调制输入提供参考信号，载波泄漏补偿信号和用于平衡I和Q调制信号振幅的校准信号。 遵循迭代的四步校准过程，直到没有观察到结果的变化。 通过调整移相器来使正交相位误差最小化。 通过调整载波泄漏补偿源，使调制输入接地的RF输出最小化，使载波泄漏最小化。 I和Q调制信号的幅度通过调节衰减器直到输出幅度相等来平衡。 最后，校正正交校准信号源，直到它们产生的输出振幅平衡。

    Phase shift and amplitude modulator
    42.
    发明授权
    Phase shift and amplitude modulator 失效
    相移和幅度调制器

    公开(公告)号：US4355289A

    公开(公告)日：1982-10-19

    申请号：US168502

    申请日：1980-07-14

    申请人： James B. Beyer ,  James B. Summers

    发明人： James B. Beyer ,  James B. Summers

    IPC分类号： H01P5/04 ,  H03C7/02 ,  H03C5/00 ,  H04L27/20

    CPC分类号： H03C7/027 ,  H01P5/04

    摘要： A parallel type modulator is disclosed which utilizes a pair of bi-phase modulators (10), each of which are capable of independent phase and amplitude modulation. In each bi-phase modulator, a carrier frequency signal is split by a power splitter (20) into two signals 180.degree. apart in phase which are passed through directional couplers (30 and 31) and a pair of PIN diodes (35 and 36) to a summing junction (37). A bias source circuit (42) delivers biasing current to the coupled outputs of the directional couplers (30, 31) and through the PIN diodes (35, 36) to the summing junction (37); this current is returned to ground through a bias return circuit (44) which conducts the DC or low frequency biasing signal but allows the carrier frequency output signal to be passed through to the output of each bi-phase modulator. Reduction of the bias current to one diode below null levels at which the intermediate signals cancel will cause a carrier frequency signal to appear at the summing junction which will be in phase with the signal passed through the other diode. A continuous variation of the bias current through one of the diodes at a level below the null current level will result in amplitude modulation of the output signal at the summing junction. The PIN diodes are always operated in their conducting regions so that large parasitic reactances at microwave frequencies are avoided. A parallel modulator can be formed of a pair of the bi-phase modulators provided with carrier frequency signals in quadrature, and with the outputs of each bi-phase modulator being summed to yield an output signal at the carrier frequency which can have an arbitrary phase angle and continuous modulation of amplitude.

    摘要翻译： 公开了一种并联型调制器，其使用一对双相调制器（10），每个双相调制器能够独立的相位和幅度调制。 在每个双相调制器中，载波频率信号由功率分配器（20）分成两个相位相差180°的信号，通过定向耦合器（30和31）和一对PIN二极管（35和36） 到总结交界处（37）。 偏置源电路（42）将偏置电流传送到定向耦合器（30,31）的耦合输出端并通过PIN二极管（35,36）传送到求和结（37）; 该电流通过传导DC或低频偏置信号的偏置返回电路（44）返回到地面，但允许载波频率输出信号通过每个双相调制器的输出。 低于中间信号消除的零电平以下的一个二极管的偏置电流将使得载波频率信号出现在与将通过另一个二极管的信号同相的求和结点处。 在低于零电流电平的电平上通过二极管之一的偏置电流的连续变化将导致在加法结处的输出信号的幅度调制。 PIN二极管总是在其导电区域中工作，从而避免了微波频率处的大的寄生电抗。 并联调制器可以由一对正交的载波频率信号的双相调制器形成，并且每个双相调制器的输出被相加以产生载波频率处的输出信号，该输出信号可以具有任意相位 角度和连续调制幅度。

    Amplitude- and periodic phase-modulation transmission system
    43.
    发明授权
    Amplitude- and periodic phase-modulation transmission system 失效
    幅度和周期性相位调制传输系统

    公开(公告)号：US4166923A

    公开(公告)日：1979-09-04

    申请号：US596539

    申请日：1975-07-16

    申请人： Kazuo Kobayashi ,  Kiyohiro Yuki ,  Yutaka Suzuki

    发明人： Kazuo Kobayashi ,  Kiyohiro Yuki ,  Yutaka Suzuki

    IPC分类号： H03C5/00 ,  H04L27/36 ,  H04L27/38 ,  H04N1/00 ,  H04N1/41 ,  H04L27/24

    CPC分类号： H03C5/00 ,  H04L27/361 ,  H04L27/389 ,  H04N1/00095 ,  H04N1/41

    摘要： A carrier is amplitude modulated in an amplitude modulator by a train of unipolar signals which alternately assume a definite voltage level and an arbitrary amplitude of one polarity. Either the carrier before it is modulated or the modulated carrier is phase modulated by the train of unipolar signals. The phase modulation takes place cyclically in that modulated carrier assumes one of predetermined N discrete phases for each occurrence of the unipolar signals. On the receiving side, the received signal is subjected to an envelope detection to extract envelope information.

    摘要翻译： 载波通过交替呈现一个极性的一定电压电平和任意幅度的单极性信号串在幅度调制器中进行幅度调制。 其前的载波被调制或调制的载波被单极性信号的串相位调制。 相位调制在周期性地发生，在调制载波中，对于单极信号的每次出现，都采用预定的N个离散相。 在接收侧，对接收到的信号进行包络检测以提取包络信息。

    Methods and apparatus for reducing intelligible crosstalk in single sideband radio systems
    44.
    发明授权
    Methods and apparatus for reducing intelligible crosstalk in single sideband radio systems 失效
    用于减少单边带无线电系统中的可理解串扰的方法和装置

    公开(公告)号：US4019140A

    公开(公告)日：1977-04-19

    申请号：US625491

    申请日：1975-10-24

    申请人： Richard Barry Swerdlow

    发明人： Richard Barry Swerdlow

    IPC分类号： H03M5/08 ,  H03C5/00 ,  H04B1/68 ,  H04B14/00 ,  H04L25/08 ,  H03B23/00 ,  H04B1/62

    CPC分类号： H04B14/002 ,  H04B1/68 ,  H03B2200/0092

    摘要： Intelligible crosstalk in microwave radio systems employing single-sideband modulation is substantially eliminated by phase-modulating the AM carrier-wave prior to its modulation by the baseband signal. The phase-modulation may comprise a periodic signal, such as a single sinusoidal tone or pseudo-random noise, or it may comprise an aperiodic signal such as a truly random noise. In this latter event, the coding signal is transmitted to the receiving location to ensure proper demodulation of the encoded signal.

    摘要翻译： 采用单边带调制的微波无线电系统中的智能串扰基本上被基带信号调制之前相位调制AM载波消除。 相位调制可以包括诸如单个正弦音调或伪随机噪声的周期性信号，或者它可以包括诸如真正随机噪声的非周期性信号。 在后一种情况下，将编码信号发送到接收位置，以确保编码信号的正确解调。

    Complex tone modulation
    45.
    发明授权
    Complex tone modulation 失效
    复调音调

    公开(公告)号：US3895316A

    公开(公告)日：1975-07-15

    申请号：US39243073

    申请日：1973-08-29

    申请人： W P INSTR INC

    发明人： FEIN HARRY

    IPC分类号： A61B7/04 ,  H03C5/00 ,  H03C3/38 ,  A61B5/02 ,  A61B5/04

    CPC分类号： A61B7/04 ,  H03C5/00

    摘要： The generation of signals which vary in both frequency and amplitude in accordance with the amplitude of an information bearing input signal is disclosed. The invention thus relates to a complex tone generator wherein a monitored parameter is transduced into an electrical input signal which is employed to both frequency modulate a carrier signal in the audible frequency range and to amplitude modulate the frequency modulated carrier; the manner of amplitude modulation resulting in suppression of the unmodulated carrier.

    摘要翻译： 公开了根据信息承载输入信号的幅度在频率和幅度上变化的信号的产生。 因此，本发明涉及一种复合音调发生器，其中监视的参数被转换成电输入信号，该电输入信号被用于对可听频率范围内的载波信号进行频率调制，并且调制调频载波的幅度; 导致抑制未调制载波的幅度调制方式。