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    Fm demodulator circuit using phase-shifting multiplier
    71.
    发明授权
    Fm demodulator circuit using phase-shifting multiplier 失效
    FM调制解调器电路使用相移单片机

    公开(公告)号：US3701030A

    公开(公告)日：1972-10-24

    申请号：US3701030D

    申请日：1971-09-20

    Applicant: TOKYO KK

    Inventor： GOCHO YUKISATO ,  INOKUCHI TAKAHIRO

    IPC: H03K6/00 ,  H03D3/18 ,  H03D3/00

    CPC classification number: H03D3/18

    Abstract: An FM demodulator circuit in which is used a phase-shifting multiplier comprising a limiter for obtaining an output of a substantially rectangular waveform, a phase shifter for shifting the phase of the output of the limiter by 90*, a multiplier for producing the vector product of the output of the limiter and the output of the phase shifter, and a low-pass filter for obtaining a demodulated signal, is further improved by the provision of a waveform converter for converting the rectangular waveform into a substantially triangular waveform, between the limiter and the phase shifter, so that a reference signal for the multiplier is thereby made to assume a substantially triangular waveform.

    Abstract translation: 一种FM解调器电路，其中使用包括用于获得基本矩形波形的输出的限幅器的移相乘法器，用于将限幅器的输出相位移动90度的移相器，用于产生矢量积的乘法器 的限幅器的输出和移相器的输出以及用于获得解调信号的低通滤波器进一步提高了通过提供一个波形转换器，用于将矩形波形转换成大致三角波形，在限幅器之间 和移相器，从而使乘法器的参考信号呈现基本上三角形的波形。

    Balanced angle modulation detector
    72.
    发明授权
    Balanced angle modulation detector 失效
    平衡角度调制检测器

    公开(公告)号：US3667060A

    公开(公告)日：1972-05-30

    申请号：US3667060D

    申请日：1970-08-26

    Applicant: RCA CORP

    Inventor： AVINS JACK

    IPC: H03D3/18 ,  H03D3/02

    CPC classification number: H03D3/18

    Abstract: A balanced angle modulation detector having first and second angle modulation wave transmission circuits comprising; a differential limiter, balanced switching means, and a single tuned circuit for generating a quadrature signal wave such that a linear discriminator characteristic is obtained. One of the transmission circuits comprises a phase lag network including a resistor and inductor connected in series coupled to an inductor and capacitor connected in parallel. The quadrature signal wave voltage, developed across the tuned circuit, is coupled with the in-phase signal wave voltage to the input electrodes of a balanced switching device whereby the modulating signal information is recovered from the angle modulated wave.

    Abstract translation: 一种具有第一和第二角度调制波发射电路的平衡角度调制检测器，包括： 差分限幅器，平衡开关装置和用于产生正交信号波的单个调谐电路，从而获得线性鉴别器特性。 传输电路之一包括相位滞后网络，其包括串联耦合到并联连接的电感器和电容器的电感器和电感器。 在调谐电路上产生的正交信号波电压与同相信号波电压耦合到平衡开关器件的输入电极，从而调制信号从角度调制波恢复。

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