Balanced transmission device

Details Balanced transmission device Balanced transmission device

1989-04-27

1990-08-21

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

Impedance matching or line equalizing

379399, 379413, H04M 1900, H04B 330

Patent

active

049513125

ABSTRACT:
A balanced transmission device having a pair of impedance element mutually of an equal value and connected between a pair of connecting terminals and an earthing point of an apparatus for superposing alternating signals on a direct current source and transmitting them through parallel two-wire cables. A transformer inserted as a high impedance source with respect to the apparatus for superposing and the transmitter, whereby the device can restrain any noise influence to realize smooth superposed transmission, with simpler arrangement but without enlarging it.

REFERENCES:
patent: 3970805 (1976-07-01), Thomas
patent: 4053722 (1977-10-01), Nahay

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