Circuit for maintaining hybrid cancellation of signals in a comm

Details Circuit for maintaining hybrid cancellation of signals in a comm Circuit for maintaining hybrid cancellation of signals in a comm

1989-10-11

1991-10-01

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379202, 379398, H04M 100

Patent

active

050540629

ABSTRACT:
A 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.

REFERENCES:
patent: 3622708 (1971-11-01), Guenther et al.
patent: 3991279 (1976-11-01), Morgan et al.
patent: 3991280 (1976-11-01), Jones et al.
patent: 4090043 (1978-05-01), Oulton
patent: 4146753 (1979-03-01), D'Arrigo et al.
patent: 4301336 (1981-11-01), Muting
Translation of Patent DE 3,144,267 A1.
"Analog Multi-Party Conference Circuit", Reynes et al., IBM Technical Disclosure Bulletin, vol. 25, No. 3A, Aug. 1982, pp. 1007-1008.

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