| 摘要 |
A coupler exhibiting substantially improved insertion loss performance comprises a split winding transformer, an inductor network, and a capacitor network. The coupler longitudinally balances voiceband signals derived from a grounded source for transmission along a balanced cable pair and simultaneously provides metallic circuit continuity between the source and the cable pair for superimposed direct current (DC) and low frequency signaling. The transformer inductively transfers voiceband signals via its windings and, further, by having associated winding sections along the tip and ring connected series opposed, allows for the transfer of DC and low frequency signals without impairment of voiceband transmission. The inductor network provides metallic circuit continuity between the transformer windings to effect this transfer of DC and low frequency signals and, in addition, suppresses the longitudinal voiceband signal components.
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