Interface circuit between a four wire line and a two wire line
November 4, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAdaptive hybrid circuit Subscriber line interface circuit with impedance synthesizer Method for current supply to a subscriber telephone from a telephone exchange Arrangement for supplying current to a subscriber telephone set Apparatus for the current supply of a subscriber set from an exchange Adaptive hybrid Arrangement for adjusting an impedance network in an integrated semiconductor circuit Method and apparatus for feeding power to a telephone line such that for restricted battery voltage there is enabled the transmission of an undistorted speech signal Apparatus in a telecommunication system for supplying power to a telephone set Method and a circuit arrangement for setting the subscriber line dummy impedances of programmable hybrid circuits InventorsAssigneeApplicationNo. 334075 filed on 11/04/1994US Classes:379/402, Hybrid circuit379/398, LINE EQUALIZATION OR IMPEDANCE MATCHING379/399.02, Circuitry to provide a coder and decoder function379/413Power supply (e.g., battery feed)ExaminersPrimary: Hofsass, JefferyAssistant: Saint-Surin, Jacques M. Attorney, Agent or FirmForeign Patent References
International ClassH04M 019/00Foreign Application Priority Data1993-11-09 SEAbstractAn interface circuit between a four wire line and a two wire line includes correlator and control circuit means connected for receiving a longitudinal signal (V1) and a transversal signal (Vt) corresponding to a differential signal received on the terminals of a two wire interface from the two wire line. The correlator and control circuit includes a circuit for creating a correction signals being a measure of the correlation between the longitudinal signal and the transversal signal. The circuit for creating the correction signal is connected for using this correction signal to adaptively control the amplifications in feed back loops so as to minimize the correlation between the longitudinal and transversal signals.Other References
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