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    • 71. 发明授权
    • Demodulators
    • 解调器
    • US3980962A
    • 1976-09-14
    • US547004
    • 1975-02-04
    • Dennis George Scotter
    • Dennis George Scotter
    • H04L27/22H04L27/18H04L27/233H03K9/04
    • H04L27/2331
    • A demodulator for a digital code differential phase shift modulated signal comprising: an input transducer for launching surface acoustic waves corresponding to a received modulated signal; a plurality of output transducers each of which is arranged to produce an output signal dependent on the relative phases of a number of successive code elements of said surface acoustic waves, each output transducer producing a larger output signal, in a predetermined sense, than any other output transducer when said successive elements have a particular phase relation, different for each output transducer; and means responsive to the relative magnitudes of the outputs of said output transducers.
    • 一种用于数字码差分相移调制信号的解调器,包括:用于发射对应于接收到的调制信号的表面声波的输入换能器; 多个输出变换器,每个输出换能器被布置为产生取决于所述表面声波的多个连续代码元素的相对相位的输出信号,每个输出换能器产生比预定意义上的任何其它的更大的输出信号 当所述连续元件具有特定的相位关系时,输出换能器对于每个输出换能器是不同的; 以及响应于所述输出换能器的输出的相对大小的装置。
    • 72. 发明授权
    • Electrical filters
    • 电动过滤器
    • US3968448A
    • 1976-07-06
    • US513778
    • 1974-10-10
    • Luis Charles Stenning
    • Luis Charles Stenning
    • H04K3/00H03B1/00H03B1/04H03K5/00H04B1/10
    • H04K3/25H04K3/827
    • An electrical filter for extracting from an applied input signal a pseudo-random sequence signal contained in the input signal comprises: an analogue delay line; means for applying to the input of the delay line an input signal containing the pseudo-random sequence signal; feedback means for producing a feedback signal in response to the signals appearing at two or more points along the length of the delay line; and combining means for combining said feedback signal with said input signal; said feedback means being constructed in dependence on said pseudo-random sequence so that, at the input of the delay line, said pseudo-random signal in said input signal is reinforced by said feedback signal.
    • 一种用于从输入信号中提取包含在输入信号中的伪随机序列信号的滤波器,包括:模拟延迟线; 用于向延迟线的输入施加包含伪随机序列信号的输入信号的装置; 响应于沿着延迟线的长度的两个或更多个点处出现的信号产生反馈信号的反馈装置; 以及用于将所述反馈信号与所述输入信号组合的组合装置; 所述反馈装置根据所述伪随机序列被构造,使得在延迟线的输入处,所述输入信号中的所述伪随机信号被所述反馈信号加强。