Adaptive hybrid circuits for crosstalk cancellation

Details Adaptive hybrid circuits for crosstalk cancellation Adaptive hybrid circuits for crosstalk cancellation

H - Electricity

04

B

340/72

H04B 3/03 (2006.01) G06G 7/163 (2006.01) H04B 1/58 (2006.01)

Patent

CA 1256526

ADAPTIVE HYBRID CIRCUIT Abstract of the Disclosure An adaptive hybrid circuit is disclosed for adaptively cancelling a crosstalk component from a transmitter to a receiver in a local station of a local area network. In a preferred embodiment the adaptive hybrid circuit is coupled to a common two- wire transmission line in the network and also between the transmitter and the receiver of the local station. The adaptive hybrid circuit is comprised of a comparator, an integrator and an adjustment circuit. An output signal from the receiver is compared in the comparator with a transmit signal to develop a first signal which causes the integrator to develop a second signal having an amplitude which varies as a function of the states of the first signal. The second signal from the integrator, a transmitter signal, and a composite signal from the transmission line containing a crosstalk component from the transmitter and a received signal component transmitted from a remote station are applied to the adjustment circuit. In the adjustment circuit the transmitter signal is multi- plied by the second signal to develop an estimate of the crosstalk component which estimate varies auto- matically to cancel the crosstalk component in the composite signal for any given transmission line impedance. When the crosstalk component is can- celled, the output of the adjustment circuit only contains the received signal which is detected by the receiver.

479543

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