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    • 2. 发明授权
    • Automatic level control device for use in telecommunication systems
    • 用于电信系统的自动电平控制装置
    • US3737774A
    • 1973-06-05
    • US3737774D
    • 1970-10-06
    • PHILIPS NV
    • VERHAGEN J
    • H04B3/10H04B3/12H04B3/04
    • H04B3/10H04B3/12
    • Automatic level control device for use in telecommunication systems, said device comprising a level control member formed by a current-dependent impedance varying with the level control signal, said device comprising, in order to enable a very accurate adjustment of the level control signal, furthermore a variable current-independent impedance controlled by the level control signal, which together with the said current-dependent impedance forms part of a Wheatstone bridge formed by two parallel impedance circuits, of a variable direct-current source connected to said bridge and of a comparison device included in the galvanometer branch of the bridge, the output signal of said comparison device controlling the direct-current source.
    • 用于电信系统的自动电平控制装置,所述装置包括由与电平控制信号变化的电流相关阻抗形成的电平控制部件,所述装置包括,以便能够非常准确地调整电平控制信号 由电平控制信号控制的可变电流独立阻抗,其与所述电流相关阻抗一起形成由两个并联阻抗电路形成的惠斯登电桥的一部分,连接到所述桥的可变直流电源和比较 设备包括在桥的检流计分支中,所述比较装置的输出信号控制直流电源。