H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 11/06 (2006.01) H04B 3/00 (2006.01) H04J 1/02 (2006.01)
Patent
CA 2241098
The present invention relates to a method and apparatus for separating a low frequency voice signal from a high frequency data signal propagating on an analog loop connecting the central office of the PSTN to a CPE. The apparatus includes a low pass filter connected in series with the tip and ring conductors of the analog loop to extract the voice signal. The apparatus also includes a high pass filter to reject the low frequency voice signal, leaving only the higher frequency components. The high pass filter features a transformer including two balanced primary winding sections, one section being in series with the tip conductor and one section being in series with the ring conductor. A junction circuit is coupled to the high pass filter to provide the signal exchange functionality needed to separate the transmit and receive components of the high speed data signal. The junction circuit includes a transmit component output coupled to a secondary winding section of the transformer for passing the transmit component applied to a transmit component input of the junction circuit to the analog loop through the transformer of the high pass filter. The junction circuit also includes a composite signal input for receiving a composite signal from a second section of the secondary winding that is a combination of the transmit component and the receive component. A processing circuit in the junction circuit extracts the receive component by canceling the transmit component in the composite signal.
Jakab Gyula
Le Minh
Nortel Networks Limited
Northern Telecom Limited
Smart & Biggar
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