Transmission bridge for a subscriber's circuit
AssigneeU.S. Philips Corporation
InventorAntonius H. J. Reuvekamp
Life of this patent
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Abstract
A transmission bridge comprising two alternating current circuits having a non-inverting signal input, an inverting signal input and a signal output, the non-inverting signal inputs being coupled to associated connecting terminals for the connection of a subscriber's line, the inverting signal inputs being connected to those terminals to which the non-inverting signal inputs of the other alternating current circuits are coupled, the outputs being coupled to the connecting terminals via supply resistors for preventing the anti-phase signals such as speech signals, present at the terminals, from being attenuated and for attenuating by means of the supply resistors in-phase signals, such as noise signals induced in the subscriber's line, present at the terminals.
Claims8
A transmission bridge for a subscriber's circuit comprising:
- two input terminals for the connection to a subscriber's line,
- two supply resistors each connected on one side to a respective one of said input terminals,
- a supply source which is coupled in a polarity independent manner to the opposite sides of each of said supply resistors, and
- two identical alternating current circuits each connected to a respective one of said input terminals and supply resistors and having complimentary output stages, said alternating current circuits having a high input impedance and a low output impedance and whose output signal is substantially identical to the input signal at the associated input terminal, a first input of each alternating current circuit being connected to the respective associated input terminal, and the output of each alternating current circuit being connected to said opposite side of said associated supply resistor which is not connected to the associated input terminal side.
Dependencies are inferred from the claim text.