Automatically adjustable bidirectional-to-unidirectional transmi

Details Automatically adjustable bidirectional-to-unidirectional transmi Automatically adjustable bidirectional-to-unidirectional transmi

1980-07-28

1982-12-21

Popek, Joseph A.

179170D, H04B 320

Patent

active

043651194

ABSTRACT:
"Transhybrid" loss is maximized in a transmission network of the active canceler type employed to couple receive and transmit unidirectional transmission paths to a bidirectional transmission path including 2-wire nonloaded type cable by controllably adjusting impedance elements of the canceler circuit in a prescribed sequence to obtain amplitude nulls of signals detected on the transmit path while supplying individual ones of a plurality of single frequency test signals to the receive path. The adjustment sequence comprises a first procedure including a plurality of iterative adjustments of predetermined impedance elements in predetermined groups until no changes in the impedance settings occur and multiple iterative adjustment of predetermined groups until no changes in the impedance settings occur. If frequencies become equal at which poles and zeros occur associated with predetermined ones of the impedance elements, the impedance values of those elements are fixed in prescribed relationship and a second procedure is employed to adjust others of the canceler elements. The impedance elements to be adjusted and the adjustment sequence are selected to rapidly converge the canceler circuit to an optimum transfer function for generating a correction signal which is substantially a replica of an error signal to be canceled from the transmit path.

REFERENCES:
patent: 3982080 (1976-09-01), Ukeiley
patent: 4074087 (1978-02-01), Blake et al.
patent: 4096361 (1978-06-01), Crawford
patent: 4096362 (1978-06-01), Crawford
patent: 4275276 (1981-06-01), Rizzo
patent: 4278848 (1981-07-01), Rizzo et al.

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