| 摘要 |
The present invention relates to a passive two wire/four wire differential telephone converter associated with an equivalent-impedance transformer Z2, comprising first (13) and second (14) impedances of value Z1, each of which is connected by its first terminal to one of the opposite terminals of the transformer. This converter further comprises, between the first terminal of the first, or respectively second, impedance and the second terminal of the second, or respectively first impedance, the mounting in series of a third (15), or fifth respectively, (17) impedance of value Z32 which is high compared with Z1 and Z2 and of a fourth (16), or sixth (18) respectively, impedance of value Z31. The output voltage of the transformer is taken between the connection points (A, B) of the third and fourth impedances on the one hand, and of the fifth and sixth impedances on the other hand, these impedances being chosen in such a way that: <IMAGE> <IMAGE>
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