Title: Negative impedance repeater with double amplification, for telephone lines

Abstract: A repeater for telephone lines, comprising two amplifier units serially connected and joined by an artificial line, the first unit having its input terminals connected to the secondary winding of a transformer of which the primary winding serves for connection of the repeater to the line, and the second unit having its output terminals connected to the primary winding of a second transformer of which the secondary winding is intended for connection of the repeater to the line.

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Inventors: Valfre, Cesare (10145 Turin, IT)

Application Number: 528008
Filing Date: 1974-11-29
Publication_date: 1976-08-10
Assignee:
Primary Class(es): 379/346 333/216, 379/348, 379/398, 379/412
Other Classes:
US Patent Ref:

2855575	Oct, 1958	Tamburelli	179/170.
3024324	Mar, 1962	Dimmer	179/170.
3503002	Mar, 1970	Valfre	179/170.
3551838	Dec, 1970	Valfre	179/170.
3860767	Jan, 1975	Boucher et al.	179/170.

Other Refs:
Primary Examiner: Cooper, William C.
Assistant Examiner: Myers, Randall P.
Attorney: