Duplex communication coupler system
US5426697A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1993 |
| Grant date | Jun 20, 1995 |
| Priority date | — |
| Expiry date | Aug 23, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/581
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The single transformer generally used in a duplex coupler for coupling local telecommunication equipment, such as a modem, to a telephone line may be replaced by a number of transformers or other suitable forms of DC isolation device which then enables each transformer and its associated circuit network to be specifically tailored to optimize the operation of the coupler system. The transmit output path 3 is connected to a transformer 2 having a center-tapped secondary winding 11 which is connected across the communication line 4. A second transformer 5 has its primary winding connected between the center-tap and the line 4, and its secondary winding coupled to the receive input 6. By optimizing each transformer the intermodulation products and other unwanted products are reduced. The coupler system may be miniaturized and the line matching components incorporated in or selected by a specific line cord designed to match the network characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.