Data transmission system and apparatus providing multi-level differential signal transmission
US5166956A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1990 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | May 21, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/4917
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A data transmission system which provides differential transmission of a multi-level interface corresponding to a binary interface formed by a plurality of binary input signals. The binary interface is encoded by an encoder into a corresponding multi-level differential interface formed by a plurality of multi-level signals, such correspondence being in accordance with a pre-selected code conversion table, and the respective multi-level signals are transmitted over respective transmission channels. Upon reception at a decoder, the signs of the differences between respective pairs of the multi-level signals are detected, and in accordance with such signs binary values are assigned to respective binary output signals of the decoder in accordance with the inverse of the code conversion table employed for encoding. Differential transmission achieves immunity from common mode noise, and multi-level encoding requires fewer channels than would be necessary for binary differential transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.