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US 4,053,716 AGranted
Switching network with a crosstalk elimination capability
AssigneeNippon Electric Co., Ltd.
InventorOsamu Enomoto
Life of this patent
Estimating the term…
Abstract
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.
Claims7
A switching network with crosstalk elimination capability comprising:
- 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 said incoming lines and said 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 primary winding connected to a selected incoming or outgoing line and at least a first secondary winding for generating a signal reverse in phase to that supplied to the primary winding;
- and
- a plurality of first capacitors each having one end connected to each said first secondary winding of the transformers and the other end connected to an incoming or outgoing line adjacent to the selected incoming or outgoing line.
3 more elements
Dependencies are inferred from the claim text.