Apparatus for coupling signals to or from a two-wire line

Details Apparatus for coupling signals to or from a two-wire line Apparatus for coupling signals to or from a two-wire line

H - Electricity

04

M

379/3, 333/40

H04M 11/00 (2006.01) H03H 7/01 (2006.01) H04L 27/00 (2006.01) H04M 11/06 (2006.01)

Patent

CA 1165913

APPARATUS FOR COUPLING SIGNALS TO OR FROM A TWO-WIRE LINE Abstract of the Disclosure Voice-band signals are coupled to and from a telephone subscriber line via a low-pass filter which has a shunt capacitor coupled across the line. In order to simultaneously couple above voice-band signals to and from the line, this capacitor is coupled to the line via windings of a transformer. The above voice-band signals are coupled via the transformer to and from the line, for example via series inductors which are series resonant with the filter capacitor, as reflected through the transformer, at above voice-band signal frequencies. A parallel resonant circuit, which has a low impedance in the voice-band, is connected in parallel with a winding of the transformer to prevent degradation of the filter characteristics in the voice-band. - 1 -

392796

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