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    Filter that minimizes in-band noise and maximizes detection sensitivity of exponentially-modulated signals
    1.
    发明授权
    Filter that minimizes in-band noise and maximizes detection sensitivity of exponentially-modulated signals 有权

    公开(公告)号：US12047049B2

    公开(公告)日：2024-07-23

    申请号：US18116047

    申请日：2023-03-01

    Applicant: DYNASPOT CORP.

    Inventor： Marvin L. Sassler ,  Alan T. Sassler

    IPC: H03H17/02 ,  H03D3/26 ,  H03H7/06 ,  H04B1/16

    CPC classification number: H03H17/0254 ,  H03D3/26 ,  H03H7/06 ,  H03H17/0219 ,  H03H17/0267 ,  H04B1/1638 ,  H03D2200/0054

    Abstract: Trans-filter/Detectors are extremely sensitive circuits that recover exponentially modulated signals buried in noise. They can be used wherever Matched Filter/Coherent Detectors are used and operate at negative input signal-to-noise ratios to recover RADAR, SONAR, communications, or data signals, as well as reduce phase noise of precision oscillators. Input signal and noise is split into two paths where complementary derivatives are extracted. Outputs of the two paths are equal in amplitude and 180 degrees relative to each other at the band center frequency. The outputs are summed, causing stationary in-band noise to be reduced by cancellation while exponentially modulated signals are undiminished. Trans-filters are Linear Time Invariant circuits, have no noise x noise threshold and can be cascaded, increasing output signal-to-noise ratio prior to detection. Trans-filters are most sensitive to all types of digital modulation, producing easily detected polarized pulses synchronous with data transitions. Trans-filters do not require coherent conversion oscillators and complex synchronizing circuits.

    Frequency discriminators
    4.
    发明授权
    Frequency discriminators 失效
    频率鉴别器

    公开(公告)号：US4150338A

    公开(公告)日：1979-04-17

    申请号：US897033

    申请日：1978-04-17

    Applicant: Merle V. Hoover

    Inventor： Merle V. Hoover

    IPC: H03D3/08 ,  H03D3/26

    CPC classification number: H03D3/08 ,  H03D3/26

    Abstract: An input signal comprising a carrier wave whose frequency may vary is applied to two complementary conductivity type transistors. Two resonant circuits, one tuned to a frequency slightly higher than and the other tuned to a frequency slightly lower than that of the nominal center frequency of the carrier wave are coupled between the respective drain electrodes of these transistors and a circuit node. The voltages developed across these resonant circuits are detected and the detection components subtracted from one another to obtain the circuit output signal.

    Abstract translation: 包括其频率可能变化的载波的输入信号被施加到两个互补导电型晶体管。 两个谐振电路被调谐到稍高于另一个被调谐到比载波的标称中心频率稍低的频率的频率上，耦合在这些晶体管的相应漏电极和电路节点之间。 检测在这些谐振电路之间产生的电压，并且将检测部件相互减去以获得电路输出信号。

    System for demodulating angle-modulated signals
    5.
    发明授权
    System for demodulating angle-modulated signals 失效
    用于解调角度调制信号的系统

    公开(公告)号：US4079330A

    公开(公告)日：1978-03-14

    申请号：US746336

    申请日：1976-12-01

    Applicant: Yukinobu Ishigaki ,  Kohei Sasamura ,  Yasuo Itoh ,  Teruo Muraoka

    Inventor： Yukinobu Ishigaki ,  Kohei Sasamura ,  Yasuo Itoh ,  Teruo Muraoka

    IPC: G11B3/00 ,  H03D3/00 ,  H03D3/02 ,  H03D3/06 ,  H03D3/24 ,  H03D3/26 ,  H04H20/89 ,  H04S3/00 ,  H03D3/22

    CPC classification number: H04H20/88 ,  H03D3/005 ,  H03D3/02 ,  H03D3/06 ,  H03D3/24 ,  H03D3/26 ,  H04H20/89

    Abstract: The inventive system demodulates angle-modulated signals. A tracking band-pass filter responds to an input angle-modulated wave signal. The tracking filter has a pass band with a center frequency controlled by a control signal. A first amplitude limiter limits the amplitude of the input angle-modulated wave signal. A differentiation circuit establishes a 90.degree. phase difference between a signal passing through the tracking band-pass filter and a signal passing through the amplitude limiter. A phase comparator responds to an input with the two signals with a 90.degree. phase difference therebetween and produces an output error signal in accordance with this phase difference. This output error signal is supplied as the control signal to the tracking band-pass filter. This output error signal is also passed through a low pass filter to produce the demodulated signal.

    Abstract translation: 本发明的系统解调角度调制信号。 跟踪带通滤波器响应输入角度调制波信号。 跟踪滤波器具有通过控制信号控制的中心频率的通带。 第一幅度限制器限制输入角度调制波信号的幅度。 差分电路在通过跟踪带通滤波器的信号和通过幅度限制器的信号之间建立90°的相位差。 相位比较器响应输入，其中两个信号之间的相位差为90°，并根据该相位差产生输出误差信号。 该输出误差信号作为控制信号提供给跟踪带通滤波器。 该输出误差信号也通过低通滤波器以产生解调信号。

    Diode-quad bridge circuit means
    6.
    发明授权
    Diode-quad bridge circuit means 失效
    二极管四桥电路方式

    公开(公告)号：US3869676A

    公开(公告)日：1975-03-04

    申请号：US46284474

    申请日：1974-04-22

    Applicant: NASA

    Inventor： HARRISON DEAN R ,  DIMEFF JOHN

    IPC: G01R23/06 ,  G01R27/16 ,  H03D3/00 ,  H03D3/26 ,  H03D1/10

    CPC classification number: H03D3/00 ,  G01R23/06 ,  G01R27/16 ,  H03D3/26

    Abstract: A transducer and frequency discriminator circuit including a four-terminal circulating diode bridge, a first pair of capacitors connected in series across two terminals of the bridge, and a second pair of capacitors, or other impedance elements, connected in series across the other two terminals of the bridge. A source of balanced alternating electrical energy for energizing the circuit is coupled between the commonly connected plates of the first pair of capacitors and the commonly connected plates of the second pair of capacitors. Due to the operation of the diode bridge, the sum of the resultant charges developed on the first pair of capacitors is proportional to the relationship between the respective capacitors of the second pair, and consequently, an output voltage taken across the first pair of capacitors will be proportional to that relationship.

    Abstract translation: 一种换能器和鉴频器电路，包括四端循环二极管桥，串联连接在桥的两个端子上的第一对电容器，以及第二对电容器或其它阻抗元件，串联连接在另外两个端子 的桥梁。 用于激励电路的平衡交流电能源耦合在第一对电容器的共同连接的板和第二对电容器的共同连接的板之间。 由于二极管桥的操作，在第一对电容器上产生的合成电荷的总和与第二对电容器的各个电容器之间的关系成比例，因此跨越第一对电容器的输出电压将 与这种关系成正比。

    Active linear discriminator circuit
    7.
    发明授权
    Active linear discriminator circuit 失效
    主动线性分辨率电路

    公开(公告)号：US3667062A

    公开(公告)日：1972-05-30

    申请号：US3667062D

    申请日：1971-03-30

    Applicant: GARY O WHITE

    Inventor： WHITE GARY O

    IPC: H03D3/26

    CPC classification number: H03D3/26

    Abstract: An active linear discriminator circuit having a transformer with a center-tapped primary and two center-tapped secondaries tuned on opposite sides of a desired center frequency, each tuned secondary output being demodulated to direct current (D.C.) levels applied across respective resistor and capacitor networks to produce a zero output when the input frequency is the desired center frequency and to produce positive and negative outputs in opposite relation proportional to input deviation above or below the center frequency.

    Abstract translation: 一种有源线性鉴频器电路，其具有在期望的中心频率的相对侧上调谐的具有中心抽头的初级和两个中心抽头次级的变压器，每个调谐的次级输出被解调为施加在相应的电阻器和电容器网络上的直流（DC）电平 以在输入频率为期望的中心频率时产生零输出，并产生与输入偏差高于或低于中心频率成正比的正负输出。

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