Patent
1979-08-06
1981-06-23
Konick, Bernard
H04B 158
Patent
active
042752760
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 (RKL and RZL) of an impedance network (202, FIG. 3) to obtain an optimum match to the impedance of the bidirectional facility (102). To this end, a plurality of tones (107) are individually supplied to a receive port (111) of the transmission network (101) and the impedance elements (RKL and RZL) are controllably adjusted in a prescribed sequence (FIGS. 7-10) to obtain amplitude nulls at a transmit port (112) of the transmission network (101). Then, an additional signal having a plurality of predetermined frequency components which repeat periodically is supplied to the receive port (111) and a predetermined one of the impedance elements (RKL) is again adjusted to obtain an average value amplitude null at the transmit port (112). In one embodiment of the invention, the additional signal is a pseudo-random noise signal having frequency components at a fixed spacing in a predetermined frequency band.
REFERENCES:
patent: 3982080 (1976-09-01), Ukeiley
patent: 4096361 (1978-06-01), Crawford
patent: 4096362 (1978-06-01), Crawford
Bell Telephone Laboratories Incorporated
Konick Bernard
Myers Randall P.
Stafford Thomas
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