US Patent 7164721 Simultaneous bidirectional signal subtraction

According to some embodiments, a circuit is adapted to convert a first voltage signal from a bidirectional signal line to a first current signal, the first voltage signal to represent first data transmitted from a first transmitter and second data transmitted from a second transmitter. The circuit may be further operable to convert a second voltage signal to a second current signal, the second voltage signal, substantially to represent the first data, and to generate a first output signal to represent the second data based on the second current signal and the first current signal. Such a circuit might be an element of a simultaneous bidirectional signaling transceiver.