Circuit for maintaining hybrid cancellation of signals in a communication system
Patent 5054062 Issued on October 1, 1991. Estimated Expiration Date: 
October 11, 2009. 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.
October 11, 2009. 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 References 3622708 Monobus interface circuit Monobus variable resistance transmission circuit Electronic hybrid circuit Transmit/receive network for telephone-subscriber station Hybrid circuit Patent #: 4301336 InventorAssigneeApplicationNo. 420648 filed on 10/11/1989US Classes:379/402, Hybrid circuit379/202.01, Conferencing379/398LINE EQUALIZATION OR IMPEDANCE MATCHINGExaminersPrimary: Ng, Jin F.Assistant: Augustus, Jhancy Attorney, Agent or FirmForeign Patent References
International ClassH04M 001/00Foreign Application Priority Data1985-12-13 CAAbstractA circuit for maintaining hybrid cancellation of signals carried by a signal bus of a communication system, in response to variations in the number of hybrid circuits connected to the bus. One or more microprocessor control switches are utilized for selectively connecting one or more balancing load impedances to the bus in response to variations in the number of hybrid circuits connected thereto, such that a constant total load impedance is maintained on the bus. Also, circuitry is associated with each of the hybrid circuits for effecting hybrid cancellation of signals on the bus relative to the constant total load impedance. The circuit is of simple design and construction, occupying every little circuit board area and being of very low cost.Other References
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