Noise-free terminal station compatible with existing master stat

Details Noise-free terminal station compatible with existing master stat Noise-free terminal station compatible with existing master stat

1986-05-23

1987-12-29

Dwyer, James L.

Telephonic communications

Private or single line system

With central power source

379167, 379416, H04M 174

Patent

active

047165847

ABSTRACT:
A terminal station operating with a current supplied from a master station exchanges signals with it through cable conductors, one of the cable conductors being grounded at the master station to allow the current to return from the terminal station. A receive circuit is formed by a first differential amplifier and a first resistor network connected in a balanced relationship to input terminals of the first differential amplifier for receiving a signal from the master station in a noise-cancelling relationship with respect to the ground potential to eliminate the effect of noise generated by the passage of the current through the ground conductor. A transmit circuit includes a second differential amplifier and a second resistor network connected in a balanced relationship to input terminals of the second differential amplifier for transmitting a signal to the master station in a noise-cancelling relationship with respect to the ground potential to eliminate the effect of the noise at the output of the second differential amplifier.

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