Electronic feeding bridge for a space division switching network

Telephonic communications – Repeater – With frequency discriminator or negative impedance element

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379398, 379413, H04B 316

Patent

active

046823557

ABSTRACT:
The invention relates to a telephone subscriber electronic feeding bridge which includes a transformer with three windings, between the line of the sub set and the connection network of the telephone unit automatic exchange or autoswitch of which it forms a part. A capacitor is interposed on one of the two wires of the line, connected furthermore to feed resistors. The third winding of the transformer, associated with the winding of the line of the set, is looped on a negative impedance. This arrangement allows impedance matching both in direct current and in alternating current.

REFERENCES:
patent: 3548109 (1970-12-01), Schnurr
patent: 3562561 (1971-02-01), Klosterman
patent: 3627952 (1971-12-01), Person
patent: 3987375 (1976-10-01), May et al.
patent: 4197431 (1980-04-01), Vis
patent: 4532384 (1985-07-01), Keriakos et al.
M. Ferry, D. Reynes, J. Suzzoni; "Adjustable Resistance Circuit"; IBM Technical Disclosure Bulletin; vol. 22, No. 11; Apr. 1980; p. 4955.

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