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49 条记录 (耗时 0.013 秒)

    Quadrature modulation arrangement with enhanced dynamic amplification range
    41.
    发明授权
    Quadrature modulation arrangement with enhanced dynamic amplification range 失效
    具有增强动态放大范围的正交调制方案

    公开(公告)号：US4384364A

    公开(公告)日：1983-05-17

    申请号：US137276

    申请日：1980-04-04

    申请人： Hansjuergen H. Henning

    发明人： Hansjuergen H. Henning

    IPC分类号： G01V1/22 ,  H04B14/00 ,  H04B1/20 ,  G01R23/14 ,  H04B11/00

    CPC分类号： H04B14/004 ,  G01V1/22

    摘要： A quadrature modulation analog transmission system provides an extended dynamic range of amplification by dividing the total gain desired between the two quadrature channels without overloading the transmission medium. The direct channel furnishes a higher gain for low-level background noise signals, while the quadrature channel furnishes a lower gain for high-level signaling tones.

    摘要翻译： 正交调制模拟传输系统通过将两个正交通道之间所需的总增益除以而不会使传输介质过载来提供扩展的动态范围。 直接信道为低级背景噪声信号提供更高的增益，而正交信道为高级信令音提供较低的增益。

    Acoustic transmission system
    42.
    发明授权
    Acoustic transmission system 失效
    声传动系统

    公开(公告)号：US4276624A

    公开(公告)日：1981-06-30

    申请号：US66182

    申请日：1979-08-13

    申请人： Charles B. Fisher ,  Sidney T. Fisher

    发明人： Charles B. Fisher ,  Sidney T. Fisher

    IPC分类号： H04B11/00 ,  H04B14/00

    CPC分类号： H04B14/004 ,  H04B11/00

    摘要： An acoustic transmission system for a gaseous or liquid transmission medium, in which the transmitting apparatus double-sideband amplitude modulates a carrier with the signal to be transmitted, the double-sideband amplitude modulated carrier is radiated acoustically over the transmission medium, and the receiving apparatus receives the modulated carrier plus noise introduced in the medium, rejects the superimposed noise by sampling and reconstruction means, and delivers the modulated carrier substantially free from superimposed noise.

    摘要翻译： 一种用于气体或液体传输介质的声传输系统，其中发射装置双边带用待传输的信号对载波进行幅度调制，双边带幅度调制载波在传输介质上被声学地辐射，并且接收装置 接收在介质中引入的调制载波加噪声，通过采样和重建装置拒绝叠加的噪声，并且传送调制载波基本上没有叠加的噪声。

    Sampling modulated waves
    43.
    发明授权
    Sampling modulated waves 失效
    采样调制波

    公开(公告)号：US4178553A

    公开(公告)日：1979-12-11

    申请号：US964832

    申请日：1978-11-30

    申请人： Charles B. Fisher ,  Sidney T. Fisher

    发明人： Charles B. Fisher ,  Sidney T. Fisher

    IPC分类号： H04B14/00 ,  H04B1/16

    CPC分类号： H04B14/004

    摘要： The method of transmission of a carrier double-sideband amplitude-modulated by a message, comprising sampling the modulated wave at regular intervals at a sampling rate greater than twice but less than four times the highest message frequency, with the sampling rate an integral sub-multiple of twice the carrier frequency of the modulated wave, the instants of sampling not occurring at instants of zero crossings of the carrier, and subsequent reconstruction of the modulated wave or the message from the sequence of samples in an integrating filter, with substantially complete accuracy.

    摘要翻译： 通过消息进行幅度调制的载波双边带的传输方法，包括以大于两倍但小于最高消息频率的四倍的采样率以规则的间隔采样调制波，采样率为整数子带， 调制波的载波频率的两倍，采样时刻不发生在载波过零点的时刻，随后在积分滤波器中从样本序列中重构调制波或消息，具有基本完全的精度 。

    Sequentially balanced modulation tone ranging system and method
    44.
    发明授权
    Sequentially balanced modulation tone ranging system and method 失效
    顺序平衡调制音测距系统和方法

    公开(公告)号：US4149168A

    公开(公告)日：1979-04-10

    申请号：US855924

    申请日：1977-11-30

    申请人： Eddy Hose

    发明人： Eddy Hose

    IPC分类号： G01S11/02 ,  G01S19/11 ,  H04B14/00 ,  G01S3/02

    CPC分类号： G01S11/02 ,  H04B14/004

    摘要： A carrier signal of a first frequency is mixed with a tone signal of a second frequency to produce an upper sideband signal at a frequency equal to the sum of the first and second frequencies and to produce a lower sideband signal at a frequency equal to the difference of the upper and lower frequencies. The upper and lower sideband signals are provided separately and sequentially to produce a sequentially balanced modulation tone ranging signal for transmission. The received sequentially balanced modulation tone ranging signal is processed to produce a measurement signal containing the phase information of the received signal at a measurement frequency. A local signal is provided at the measurement frequency. The phase of the measurement signal is subtracted from the phase of the local signal to produce a phase shift information signal for sequentially indicating the phase shift in the upper and lower sidebands of the received signal. When it is desired to transmit data in addition to the ranging tone, the carrier signal and/or the tone signal is modulated by a data signal prior to mixing the carrier signal with the tone signal.

    摘要翻译： 将第一频率的载波信号与第二频率的音调信号混合以产生频率等于第一和第二频率之和的频率的上边带信号，并产生频率等于差分的下边带信号 的上下频率。 单独和顺序地提供上和下边带信号以产生用于传输的顺序平衡的调制音调测信号。 处理接收到的顺序平衡的调制音调测信号，以产生包含测量频率的接收信号的相位信息的测量信号。 以测量频率提供本地信号。 从本地信号的相位减去测量信号的相位，以产生用于顺序地指示接收信号的上边带和下边带中的相移的相移信息信号。 当期望除了测距音之外传送数据时，在将载波信号与音调信号混合之前，载波信号和/或音调信号由数据信号调制。