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142 条记录 (耗时 0.015 秒)

    Modulation apparatus
    1.
    发明授权
    Modulation apparatus 失效
    调制装置

    公开(公告)号：US6034574A

    公开(公告)日：2000-03-07

    申请号：US44017

    申请日：1998-03-19

    申请人： Hideaki Sato

    发明人： Hideaki Sato

    IPC分类号： H03C1/58 ,  H03C7/02 ,  H03D9/06 ,  H03C1/08 ,  H01P1/10 ,  H01P1/15 ,  H03C1/00

    CPC分类号： H03C7/027

    摘要： A modulation apparatus connected to a termination edge of a waveguide path has a matching circuit, a detection diode for detecting a high-frequency signal inputted from the waveguide path, a resistor consumes a detection output of the detection diode, a transmission signal source controls a bias of the detection diode in accordance with a transmission signal, and a high-frequency choke. The high-frequency signal inputted when the detection diode is in a cut-off condition is reflected to the waveguide path. The high-frequency signal inputted when the detection diode is conductive is detected in the detection diode and consumed in a resistor.

    摘要翻译： 连接到波导路径的终端边缘的调制装置具有匹配电路，用于检测从波导路径输入的高频信号的检测二极管，消耗检测二极管的检测输出的电阻器，控制检测二极管的发送信号源 检测二极管根据传输信号的偏置和高频扼流圈。 当检测二极管处于截止状态时输入的高频信号被反射到波导路径。 检测二极管导通时输入的高频信号在检测二极管中被检测并消耗在电阻中。

    Circuit for simultaneous amplitude modulation of a number of signals
    2.
    发明授权
    Circuit for simultaneous amplitude modulation of a number of signals 失效
    用于同时调幅多个信号的电路

    公开(公告)号：US5434546A

    公开(公告)日：1995-07-18

    申请号：US151736

    申请日：1993-11-15

    申请人： James K. Palmer

    发明人： James K. Palmer

    IPC分类号： H03C1/58 ,  H03C1/00 ,  H03C1/54

    CPC分类号： H03C1/58

    摘要： A method for simultaneously imposing a single modulating signal on a number of constant frequency carriers includes applying the single modulating signal and all of the carriers to a doubly-balanced mixer circuit that produces sideband signals that are uncontaminated by the carriers. The sideband signals thus produced are then combined with signals proportional to the carriers in a linear circuit to obtain an output signal equivalent to a signal that would result from combining separately modulated carriers.

    摘要翻译： 一种用于在多个恒定频率载波上同时施加单个调制信号的方法包括将单个调制信号和所有载波应用于产生未受载波污染的边带信号的双平衡混频器电路。 然后将由此产生的边带信号与线性电路中与载波成比例的信号组合，以获得等效于由组合单独调制载波产生的信号的输出信号。

    Double sideband modulator
    4.
    发明授权
    Double sideband modulator 失效
    双边带调制器

    公开(公告)号：US3995236A

    公开(公告)日：1976-11-30

    申请号：US510615

    申请日：1974-09-30

    申请人： Clifford E. Mueller ,  William E. Mears

    发明人： Clifford E. Mueller ,  William E. Mears

    IPC分类号： G01S1/50 ,  H03C1/58 ,  H03C1/14 ,  H03D1/24

    CPC分类号： G01S1/50 ,  H03C1/58

    摘要： A modulator employs a pair of variable RF attenuators to produce a double sideband, suppressed carrier output. The attenuator devices are PIN diodes which are rendered alternately conductive in synchronism with the recurring half cycles of the audio frequency input signal which is to be impressed upon the radio frequency signal as modulation. As each diode conducts the RF signal, its attenuation is varied by a control signal in a manner to provide the conducted RF signal with a modulation envelope that follows the amplitude of the audio input. The modulated signals from both diodes are combined at the modulator output, after a phase reversal of the modulated signal from one of the diodes, in order to thereby provide a double sideband, suppressed carrier output signal. The control signal for each conducting diode is produced by a function generator operating within a closed loop feedback system. The generator receives the audio input and a recreated modulating signal derived without carrier insertion from an envelope detector on the modulator output, and compares the recreated modulation with the original audio input to provide the control signal with the proper wave shape. An electronic goniometer for a VOR navigation system employs two of the double sideband modulators responsive to 30 Hz input signals that are 90.degree. out of phase; thus a 90.degree. modulation envelope phase difference exists at the goniometer outputs as required for the variable phase antenna feeds of a VOR transmitting system.

    摘要翻译： 调制器采用一对可变RF衰减器来产生双边带，抑制载波输出。 衰减器件是PIN二极管，它们与要作为调制对射频信号施加的音频输入信号的循环半周期同步地交替导通。 当每个二极管导通RF信号时，其衰减以控制信号改变，以便向传导的RF信号提供跟随音频输入的幅度的调制包络。 在来自二极管之一的调制信号的相位反相之后，来自两个二极管的调制信号在调制器输出端被组合，从而提供双边带抑制的载波输出信号。 每个导通二极管的控制信号由在闭环反馈系统内运行的功能发生器产生。 发生器接收音频输入，并且在调制器输出上从包络检测器接收到未载波插入的重新产生的调制信号，并将重新创建的调制与原始音频输入进行比较，以提供具有适当波形的控制信号。 用于VOR导航系统的电子测角仪采用两个双边带调制器，响应于90°异相的30 Hz输入信号; 因此在VOR发射系统的可变相位天线馈送所需的测角器输出处存在90度调制包络相位差。

    Shielded balanced microwave analog multiplier
    6.
    发明授权
    Shielded balanced microwave analog multiplier 失效
    屏蔽平衡微波模拟乘法器

    公开(公告)号：US3582759A

    公开(公告)日：1971-06-01

    申请号：US3582759D

    申请日：1969-10-14

    申请人： JOHN H MALLOY

    发明人： MALLOY JOHN H

    IPC分类号： G06G7/164 ,  H03C1/58 ,  H03C7/02 ,  H02M5/20

    CPC分类号： H03C1/58 ,  G06G7/164 ,  H03C7/027

    摘要： A completely shielded and balanced diode bridge, having biased diodes to insure dynamic balance and square-law operation, is fed by sum and difference signals from a hybrid ring drive which produces an output signal proportional to the product of the instantaneous amplitudes of the original microwave input signals applied to the hybrid ring drive.