Patent
1979-08-06
1981-07-14
Konick, Bernard
H04B 158
Patent
active
042788480
ABSTRACT:
Transhybrid loss is maximized in a transmission network (FIG. 1, 101) of the type for coupling a bidirectional transmission facility (102, 2-wire) to receive (103) and transmit (104) unidirectional transmission facilities (4-wire) by automatically adjusting impedance elements (RKN, RZN, etc.) of an impedance network (202, FIG. 3, FIG. 4) to obtain an optimum match to the impedance of the bidirectional facility (102). To this end, individual ones of a plurality of tones (107) are supplied to a receive port (111) of the transmission network (101) and the impedance elements (RKN, RZN, etc.) are controllably adjusted in a prescribed sequence (FIGS. 8-16) to obtain amplitude nulls at a transmit port (112) of the transmission network (101). In one embodiment, predetermined ones of the impedance adjustments (RKN, RZN, etc., 820-823, 828-831) are iterated with predetermined ones of the tone signals being supplied to the receive port (111) further to optimize the impedance match.
REFERENCES:
patent: 3178521 (1965-04-01), Brown
patent: 3982080 (1976-09-01), Ukeiley
patent: 4096361 (1978-06-01), Crawford
patent: 4096362 (1978-06-01), Crawford
patent: 4103118 (1978-07-01), Bergman
Rizzo Joseph F.
Rudisill, Jr. John A.
Bell Telephone Laboratories Incorporated
Konick Bernard
Myers Randall P.
Stafford Thomas
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