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    • 4. 发明授权
    • Device for measuring echo return loss in a two-two wire line system
    • 用于测量二线制线系统回波回波损耗的装置
    • US5943392A
    • 1999-08-24
    • US788294
    • 1997-01-24
    • Gregory David Olson
    • Gregory David Olson
    • H04B3/46H04M1/24
    • H04B3/493
    • The present invention is directed to an adaptor for measuring an echo return loss in a communication system. The adaptor includes two transformers, each having a primary winding and two secondary windings. The secondary windings are cross-connected to form first and second out of phase circuits. The first circuit includes impedance elements which match an impedance of an external device. When the external device is attached to the second circuit, the first and second circuits are schematically equivalent, albeit out of phase. When an oscillation signal is input to one transformer, the matched impedance and out-of-phase connection of the secondary windings cancel the signal such that only an echo signal is output by the other transformer.
    • 本发明涉及一种用于测量通信系统中的回波回波损耗的适配器。 适配器包括两个变压器,每个具有初级绕组和两个次级绕组。 次级绕组交叉连接形成第一和第二异相电路。 第一电路包括与外部设备的阻抗匹配的阻抗元件。 当外部设备附接到第二电路时,第一和第二电路示意性地相当于尽管相位不同。 当振荡信号输入到一个变压器时,次级绕组的匹配阻抗和异相连接消除了信号,使得只有一个回波信号被另一个变压器输出。