US PATENT SUBCLASS 370 / 200
Current as of: June, 1999
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(under the class definition) Subject matter wherein an additional channel is derived from two suitable arranged pairs of wires called side channels, and each pair of wires is a channel itself and at the same time acts as one conductor of the phantom channel.
(1) Note. The phantom channel is added by differentially modulating the longitudinal, common mode signals of each wire channel at one end of both wire channels and by detecting the difference at the other end of said wire channels. Signals from the phantom channel thus are canceled from the output of the individual wire channels, but appear as the difference between values of common mode currents carried by the wire channels.
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45, for a phantom connection on a loaded circuit.