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    • 48. 发明授权
    • Method and apparatus for cancelling noise in a received signal by signal
subtraction
    • 通过信号减法来消除接收信号中的噪声的方法和装置
    • US5109533A
    • 1992-04-28
    • US421569
    • 1989-10-11
    • Katsutoshi MineYuji MorimotoKoji OgawaKatsuyoshi WakabayashiHiroshi Katsuta
    • Katsutoshi MineYuji MorimotoKoji OgawaKatsuyoshi WakabayashiHiroshi Katsuta
    • H04B15/00H04B1/12
    • H04B1/12
    • An industrial measuring apparatus comprises first and second sensors having identical measuring characteristics and arranged close to each other and also close to a common subject of measurement, for measuring the same parameter, a transmitting unit having an adder and a first subtracter respectively connected the sensors through amplifiers, and a receiving unit having a second subtracter connected to the adder and the first subtracter through two transmission lines and constituting a noise canceling device in cooperation with the adder and the first subtracter. The second subtracter produces a receiving signal by subtracting the output of the subtracter representing the difference between the outputs of the first and second sensors from the output of the adder representing the sum of the outputs of the two sensors. Noise superposed on the outputs of the adder and subtracter during transmission is canceled out when the receiving signal is produced, whereby a receiving signal exactly corresponding to the sensor signal is easily obtained.
    • 一种工业测量装置包括具有相同测量特性的第一和第二传感器,彼此靠近并且靠近普通的测量对象,用于测量相同的参数,具有加法器和第一减法器的发送单元分别连接传感器通过 放大器和具有通过两条传输线连接到加法器和第一减法器的第二减法器的接收单元,并与加法器和第一减法器协同构成噪声消除装置。 第二减法器通过从表示两个传感器的输出之和的加法器的输出中减去表示第一和第二传感器的输出之间的差的减法器的输出来产生接收信号。 当产生接收信号时,在发送期间叠加在加法器和减法器的输出上的噪声被抵消,从而容易获得与传感器信号完全相对应的接收信号。