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 Switching network with a crosstalk elimination capability

Details
Inventors: Enomoto, Osamu;
Assignee: Nippon Electric Company, Ltd. (Tokyo, JA)
Primary Examiner: Robinson; Thomas A.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Rothwell, Mion, Zinn and Macpeak

A switching network having particular application in telephone exchanges is provided with crosstalk elimination capability. The crosstalk is effectively cancelled by generating signals which are reverse in phase to the crosstalk signals and adding these generated signals to the crosstalk signals.

DETAILED DESCRIPTION It is, therefore, an object of the present invention to provide a switching network capable of eliminating the above-mentioned crosstalk.
The present switching network with crosstalk elimination capability comprises a group of incoming lines connected to subscribers, a group of outgoing lines intersecting said incoming line group, a plurality of switching elements provided at preselected crosspoints formed between these incoming lines and outgoing lines for interconnecting a desired incoming line and a desired outgoing line in response to a call from a subscriber, a plurality of transformers each having a first winding connected to a selected incoming or outgoing line and a second winding for generating a signal reverse in phase to that supplied to the first winding and a plurality of capacitors each having one end connected to each second winding of the transformers and the other end connected to an incoming or outgoing line adjacent to the selected incoming or outgoing line.



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