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    Signal privacy with safety feature
    16.
    发明授权
    Signal privacy with safety feature 失效
    信号隐私与安全功能

    公开(公告)号：US3887772A

    公开(公告)日：1975-06-03

    申请号：US54297644

    申请日：1944-06-30

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： MILLER RALPH L

    IPC: H04K1/02 ,  H04M1/68

    CPC classification number: H04K1/02

    Abstract: 1. In a signal privacy system, a signal current input circuit, a privacy equipment including a source for supplying masking currents thereto, means for combining said masking currents with said signal current for disguising the identity of the signals, a circuit controller having a normal condition and an operated condition, means to impress a portion of said masking currents from said source on said circuit controller, said portion normally having a critical value such as to hold said controller in its normal condition, said circuit controller in its operated condition disabling said signal current input circuit from supplying signal current to said combining means.

    Abstract translation: 在信号隐私系统中，信号电流输入电路，包括用于提供屏蔽电流的源的隐私设备，用于将所述掩蔽电流与所述信号电流组合以伪装信号的身份的装置，具有正常的电路控制器 条件和操作条件，用于在所述电路控制器上施加来自所述源的所述掩蔽电流的一部分的装置，所述部分通常具有临界值，以将所述控制器保持在其正常状态，所述电路控制器在其操作状态下禁用所述 信号电流输入电路从提供信号电流到所述组合装置。

    Error reduction logic network for harmonic measurement system
    17.
    发明授权
    Error reduction logic network for harmonic measurement system 失效
    谐波测量系统的误差降低逻辑网络

    公开(公告)号：US3629510A

    公开(公告)日：1971-12-21

    申请号：US3629510D

    申请日：1969-11-26

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： ANDERSON FREDERICK N ,  MILLER RALPH L

    IPC: G10L25/90 ,  G10L1/02

    CPC classification number: G10L25/90

    Abstract: The fundamental period of a complex periodic signal may be determined by measuring the periods of individual harmonics of the periodic signal and finding their smallest common multiple. A useful display of harmonics and their submultiples is called a period histogram. Since the fundamental period in a period histogram is an integral multiple of a number of harmonics and is characterized by a maximum amplitude pulse, the time of occurrence of the first maximum pulse may be taken to represent the fundamental period of the complex periodic signal. However, because the largest peak of the histogram does not always correspond to the fundamental frequency of a wave, occasional errors in the indication of pitch may result. Such errors may be obviated by examining the pitch signal developed from a histogram measurement, applying logical tests to determine its acceptability and, if the indicated pitch is found to be unacceptable, by substituting a more acceptable value.

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