Transmission bridge for a telephone subscriber's line circuit

Details Transmission bridge for a telephone subscriber's line circuit Transmission bridge for a telephone subscriber's line circuit

Category

H - Electricity

Subcategory

04

Subsubcategory

M

CPC

379/67

IPC codes

H04M 7/00 (2006.01) H04M 19/00 (2006.01)

Type

Patent

Patent number

CA 1138140

Description

ABSTRACT A transmission bridge comprising, arranged between two line terminals a series arrangement of two primary windings of a transformer and an intervening capacitor, two supply resistors each connected to a respective one of the terminals, secondary windings of the transformer are used to provide voltages equal to the a.c. voltages appearing at the terminals and these voltages are fed via respective alternating current circuits having a high input impedance, a low output impedance and a gain factor equal to unity, the outputs of these-circuits being connected to the respective supply resistors in such a manner that the same a.c. voltage appears at both ends of each resistor. As a result, wanted anti- phase voltage signals between the terminals are not attenuated by the supply resistors whereas the supply resistors do attenuate unwanted in- phase signals.

Application Number

337849

Affiliated with

Also associated with

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